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Effects of agronomic characters and photosynthetic parameters of glyphosate on sea island cotton QIN Guoli, WANG Weiran, WANG Meng, YANG Jing, HUANG Xinglei, LIU Zhiqing, ZHU Jiahui, Alifu Aierxi, KONG Jie, CHEN Guodong Xinjiang Agricultural Sciences    2023, 60 (12): 2861-2868.   DOI: 10.6048/j.issn.1001-4330.2023.12.001 Abstract （364）   HTML （33）    PDF （1491KB）（160）       Knowledge map    【Objective】To study the effects of agronomical character and leaf photosynthetic parameters by different concentrations of glyphosate on glyphosate island cotton in the hope of providing chemical skills for weeding.【Methods】Using glyphosate-resistant Xinchangmian 5 as the research object and spraying four concentrations of glyphosate1.25%, 2.5%, 5.0%, 10.0% at 10 leaf stage, respectively, then plant height, stem diameter, leaf stage and photosynthetic indexes were measured.【Results】Compared with the control, plant height, stem diameter, leaf stage, chlorophyll content, net photosynthetic rate (Pn), stomatal conductance (Gs), transpiration rate (Tr), maximum photochemical efficiency of PSⅡ(Fv/Fm) and potential activity of PSⅡ(Fv/Fo) with treated by four concentrations of glyphosate were all decreased in sea island cotton. The glyphosate with higher concentrations, the more dramatic decline. However, the intercellular CO2 concentration (Ci) showed an increasing trend. The treatment by 1.25% and 2.5% had no difference with control after 14 days of spraying, and the agronomic traits returned to the normal level after 24 days.【Conclusion】The growth trends reduce significantly by spraying 4 concentrations of glyphosate at the bud stage. More than 5% concentration of glyphosate affect the growth seriously sea island cotton Xinchangmian 5, so it is suggested that concentration below 2.5% of glyphosate be applied in production. Table and Figures | Reference | Related Articles | Metrics | Comments（0）

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Evaluation and index screening of heat resistance of Gossypium hirsutum germplasm resources WANG Peng, ZHENG Kai, ZHAO Jieyin, GAO Wenju, LONG Yilei, CHEN Quanjia, QU Yanying Xinjiang Agricultural Sciences    2023, 60 (9): 2081-2090.   DOI: 10.6048/j.issn.1001-4330.2023.09.001 Abstract （384）   HTML （49）    PDF （1450KB）（129）       Knowledge map    【Objective】 This study first comprehensively evaluated the heat resistance of 24 Gossypium hirsutum germplasm resources.【Methods】 Based on the two-year comprehensive evaluation of heat resistance D value cluster analysis.Selecting 24 cotton germplasm materials.Randomized block design.Measurement of relevant indicators.【Results】 It was found that 24 Gossypium hirsutum resource materials could be divided into 3 categories.The first category was heat-resistant materials, the second category was intermediate-type materials, and the third category was heat-sensitive materials.An evaluation model for the heat resistance of Gossypium hirsutum was established through a stepwise regression equation: D=-0.111+0.175X2+0.470X3+1.211X4 (R2=0.914,8).According to the established optimal regression equation, the heat resistance of Gossypium hirsutum materials, the comprehensive evaluation indexes of cotton heat resistance were established.Correlation analysis and difference analysis found that seed cotton yield, boll weight and lint yield could be used as evaluation indicators of cotton field heat resistance, while plant height and lint had nothing to do with heat resistance.【Conclusion】 In this study, four heat-resistant Gossypium hirsutum resource materials were selected, and the seed cotton yield, boll weight and lint yield were established as the indicators for evaluating the field heat resistance of Gossypium hirsutum, and the peroxidase, malondialdehyde and chlorophyll content were used indoors.The index of heat resistance evaluation provides a reference for the rapid breeding of heat-resistant cotton varieties and the research of cotton heat-resistant mechanism. Table and Figures | Reference | Related Articles | Metrics | Comments（0）

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QTL mapping and genomic selection of maize leaf width SUN Fenglei, REN Jiaojiao, LEI Bin, GAO Wenwei, QU Yanying Xinjiang Agricultural Sciences    2023, 60 (10): 2341-2351.   DOI: 10.6048/j.issn.1001-4330.2023.10.001 Abstract （337）   HTML （59）    PDF （1733KB）（119）       Knowledge map    【Objective】 To discover candidate genes related to drought resistance in the hope of providing theoretical basis for subsequent identification and identification and evaluation of drought resistance of cotton and research on drought resistance genes.【Methods】 In this experiment, 20 extreme drought and drought sensitive materials selected from recombinant inbred lines were constructed from Upland Cotton Shiyuan 321 and Kui 85-174.The extreme drought and extremely sensitive drought pools were constructed respectively, BSA sequencing was analyzed with the parents, and candidate genes were mined by BSA sequencing analysis using the upland cotton genome as a reference.【Results】 The results showed that they were finally associated with 3 related candidate regions.The total length of the candidate regions was 6.12 Mb, which contained a total of 86 genes.Combining GO annotation, KEGG pathway and five key indicators selected in the previous stage, through qRT-PCR detection and analysis, a total of 5 candidate genes were finally determined.【Conclusion】 The expression levels of the five genes in leaves were significantly higher than those in roots and stems.And the expression levels in drought-resistant materials were all higher materials with weak drought resistance, and the overall trend was “rising first and then falling”. Table and Figures | Reference | Related Articles | Metrics | Comments（0）

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Xinjiang Agricultural Sciences    2023, 60 (12): 0-0.   Abstract （121）      PDF （27546KB）（111）       Knowledge map    Related Articles | Metrics | Comments（0）

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Effects of different seedling emergence water on soil salt content and cotton growth WAN Yanan, XING Zhi, SHI Yuanqiang, WANG Tangang, WANG Jichuan, LI Huiqin, MA Li, LI Wenjun, WU Bingrong Xinjiang Agricultural Sciences    2023, 60 (10): 2352-2360.   DOI: 10.6048/j.issn.1001-4330.2023.10.002 Abstract （1502）   HTML （28）    PDF （1320KB）（103）       Knowledge map    【Objective】 This study aims to study the effects of drip seedling emergence on soil salt characteristics and cotton growth in cotton field in southern Xinjiang under the condition of no irrigation in winter and spring.【Methods】 Xinluzhong 67 was taken as the test material, three seedling emergence water quantities, 150 m3/hm2 (W1), 300 m3/hm2 (W2) and 450 m3/hm2 (W3) respectively, were set to observe the dynamic changes of soil pH and salt content, cotton seedling emergence rate, agronomic characters, dry matter accumulation characteristics and yield characteristics.【Results】 The pH of topsoil treated with W3, W2 and W1 decreased by 0.57, 0.43 and 0.19, respectively at the seedling stage, and the salt content decreased by 44.19%, 38.70% and 28.72%, respectively, but the salt washing effect decreased gradually after the full bud stage.The emergence rate of W2 treatment was 87.31%, which increased by 11.44 and 5.78 percentage points respectively compared with W3 and W1.The greater the amount of seedling emergence water, the greater the index value of cotton agronomic characters.The plant height and stem diameter of W3 treatment increased by 2.71%, 8.31% and 5.15%, 8.18%, respectively compared with W2 and W1.The average leaf area index (LAI) of W3 treatment increased by 7.57% and 11.46%, respectively compared with W2 and W1.The total dry matter accumulation of shoot treated with W3 increased by 5.55% and 7.75%, respectively compared with W2 and W1.The dry matter distribution coefficient of stem was W1 > W2 > W3, and that of leaf and reproductive organ was W3 > W2 > W1.The amount of seedling emergence water had a certain impact on the number of bolls per plant, but had little impact on the boll weight and lint percentage.The number of bolls per plant, boll weight and lint percentage of W3 treatment were the largest, but the harvested density of W2 treatment was the largest, and the final yield of W2 treatment was the highest, but there was no significant difference with W3 treatment.【Conclusion】 Higher seedling emergence water can significantly reduce the pH value and salt content of soil surface during seedling emergence, promote the growth of cotton plant and the effective accumulation of dry matter, which is conducive to the formation of yield components per plant.However, too much irrigation will affect the seedling emergence rate.The yield is higher when the seedling emergence water of drip irrigation is 300~450 m3/hm2. Table and Figures | Reference | Related Articles | Metrics | Comments（0）

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Xinjiang Agricultural Sciences    2023, 60 (7): 0-0.   Abstract （58）      PDF （34100KB）（102）       Knowledge map    Related Articles | Metrics | Comments（0）

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Identification and evaluation of salt tolerance of rice recombinant inbred lines at bud and seedling stages ZHANG Yanhong, HOU Tianyu, BA Yinhua, ZHAO Caiyue, LYU Yuping, Buhalikeimu Abunzi, ZHAO Zhiqiang, LI Dong, DU Xiaojing, YUAN Jie, WANG Fengbin Xinjiang Agricultural Sciences    2023, 60 (5): 1041-1049.   DOI: 10.6048/j.issn.1001-4330.2023.05.001 Abstract （125）   HTML （1）    PDF （1336KB）（98）       Knowledge map    【Objective】 Which seriously restricts the production and development of rice, so it is of great significance to identify the salt tolerance of rice germplasm resources at bud and seedling stages.The results have provided germplasm resources and reference for further digging salt-tolerant rice germplasm and breeding new varieties.【Methods】 A total of 219 stable recombinant inbred lines were used as experimental materials to identify and evaluate the salt tolerance of rice at bud stage and seedling stage using 1.2% NaCl solution and 0.7% NaCl solution, respectively.【Result】 The results showed that the germination potential and germination rate decreased significantly after the treatment with 1.2% NaCl, and 4 salt-tolerant materials and 6 sensitive materials were screened.The germination potential, germination rate, bud length and root length of salt-tolerant materials decreased slowly, while the germination potential, germination rate, bud length and root length of sensitive materials decreased significantly.After 0.7% NaCl treatment at seedling stage, the survival rate of population materials decreased significantly.The comparison of phenotypes between salt-tolerant materials and sensitive materials showed that the plant height and survival rate of salt-tolerant materials decreased but did not reach a significant level, while the plant height and survival rate of sensitive materials decreased significantly, and the inhibition degree of salt-tolerant materials was less than that of sensitive materials.【Conclusion】 The relative germination potential, relative germination rate and survival rate of 219 materials decreased significantly after salt stress at bud stage.The salinity tolerance of salt-tolerant materials is different from that of sensitive materials.The salinity stress of salt-tolerant materials is lower than that of sensitive materials.Eighteen materials with strong salt tolerance at budding stage are screened and seedlings of strong salt tolerance material 2 are also obtained. Table and Figures | Reference | Related Articles | Metrics | Comments（0）

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Xinjiang Agricultural Sciences    2023, 60 (9): 0-0.   Abstract （157）      PDF （13223KB）（96）       Knowledge map    Related Articles | Metrics | Comments（0）

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Effects of different delinting modes on seed vigor and seedling characteristics of cotton under PEG stress Mierzhati Mutalifu, SHI Xiunan, BO Junbing, Zubaidai Abudukerimu, Wulejialehasi Azhati, SHI Shubing Xinjiang Agricultural Sciences    2023, 60 (7): 1561-1568.   DOI: 10.6048/j.issn.1001-4330.2023.07.001 Abstract （1001）   HTML （31）    PDF （718KB）（90）       Knowledge map    【Objective】 To study the effects of different delinting modes on cotton seed vigor and seedling characteristics under PEG stress in the hope of providing theoretical support for producing cotton seeds with high vigor.【Methods】 Xinluzao 64 was used as the experimental material and three delinting treatments including T1 (sulfuric acid), T2 (laser) and T3 (laser) were set.Then standard germination test was carried out under four modes CK (0%), P5 (5%), P15 (15%) and P25 (25%) of PEG-8000 concentration.【Results】 With the increase of PEG-8000 concentration, the germination rate, germination potential, germination index, vigor index, dry weight of vegetative organs, plant length, contents of soluble sugar and peroxidase decreased at seedling stage.While the contents of malondialdehyde and proline significantly increased.Simultaneously, the average of stem diameter, volume and average diameter of root increased first and then decreased at seedling stage.Significant effects were found on cotton seed germination rate and germination potential under different delinting methods.Among them, germination rate, germination potential, root volume, average root diameter, the contents of proline and peroxidase showed T1 > T2 > T3 under three delinting methods.The germination index, vigor index, average stem diameter, root length and root surface area were performed as T1 > T3 > T2.The contents of soluble sugar and malondialdehyde indicated T3 > T2 > T1 among three delinting modes.【Conclusion】 Compared with delinting method of sulfuric acid depilation, the germination rate and germination potential of cotton seeds are reduced using laser depilation method, the seed vitality and drought resistance is improved. Table and Figures | Reference | Related Articles | Metrics | Comments（0）

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Xinjiang Agricultural Sciences    2023, 60 (5): 0-0.   Abstract （52）      PDF （13592KB）（89）       Knowledge map    Related Articles | Metrics | Comments（0）

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Effects of planting mode and irrigation quota on yield and fiber quality of machine-picked long-staple cotton WANG Xin, LIN Tao, CUI Jianping, WU Fengquan, TANG Zhixuan, CUI Laiyuan, GUO Rensong, WANG Liang, ZHENG Zipiao Xinjiang Agricultural Sciences    2023, 60 (8): 1821-1829.   DOI: 10.6048/j.issn.1001-4330.2023.08.001 Abstract （223）   HTML （31）    PDF （1179KB）（88）       Knowledge map    【Objective】 Effects of planting mode and irrigation quota on yield and fiber quality of machine-picked long-staple cotton and provide a theoretical basis for improving the quality of machine-picked long-staple cotton.【Methods】 This study adopted a split-plot experimental design.Under the same planting density, three planting patterns were set: one film with three rows (S3), one film with four rows (S4), and one film with six rows (S6).The three irrigation quotas were: 3,150 m3/hm2 [W1, severe deficit (field capacity 50%)], 4,050 m3/hm2 [W2, mild deficit (field capacity 75%)] and 4,980 m3/hm2 [ W3, slight deficit (field capacity 100%)].【Results】 Under different row spacing and irrigation quota, the accumulation of cotton dry matter conformed to the logistic growth function model.Under the same irrigation quota, with the expansion of the average row spacing, it enter the period of rapid dry matter accumulation earlier and increase Vm.The average Vm of S3 treatment 0.62 and 0.77 g/(plant·d) higher than that of S4 and S6 treatments, respectively.Under the same planting mode, with the increase of irrigation quota, the dry matter accumulation rate faster and the rapid accumulation period longer.The increase of average row spacing and irrigation quota significantly improved the number of bolls per plant and the quality of bolls, and finally increased the yield.There was no significant difference between W2 and W3 treatments.In terms of defoliation and branch hanging, under the same irrigation quota, with the expansion of the average row spacing, the defoliation rate of long-staple cotton was significantly increased, and the hanging branch rate was significantly reduced; under the same planting mode, with the increase of irrigation quota, oth leaf rate and branch hanging rate were significantly increased.In the interaction between the production and fiber quality, the defoliation rate of S3W3 treatment was the highest, and the branch hanging rate of S3W1 treatment was the lowest.In terms of fiber quality, the half-average length, uniformity and textile parameters increased with the increase of the average row spacing; the effect of irrigation quota on fiber quality was not significant, but the W1 treatment showed better fiber quality.【Conclusion】 The combination of equal row spacing and mild deficit irrigation (S3W2) is beneficial to the transfer of dry matter accumulation to reproductive organs, and the number of bolls per plant and the weight of single bolls are significantly increased, which is different from the seed cotton yield under the full irrigation treatment.And the defoliation rate is higher, the leaf hanging rate is lower, and the fiber quality is better. Table and Figures | Reference | Related Articles | Metrics | Comments（0）

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Effects of sowing date on stem traits and population dynamics of ultra late winter wheat TIAN Wenqiang, DONG Yanxue, SHI Yongqing, LEI Junjie, SUN Ganggang, WANG Hongyi, NIE Lingfan, GOU Fei, AI Hongyu, SHI Shubing, ZHANG Jinshan Xinjiang Agricultural Sciences    2023, 60 (6): 1301-1307.   DOI: 10.6048/j.issn.1001-4330.2023.06.001 Abstract （127）   HTML （3）    PDF （823KB）（87）       Knowledge map    【Objective】 To further explore the rules of stem traits and population dynamic changes of ultra-late sowing winter wheat in northern Xinjiang and study the growth difference between ultra-late sowing wheat and suitable sowing wheat in the hope of providing some theoretical basis for the winter wheat's high yield.【Methods】 Using a randomized block design, five ultra late sowing dates (T1, T2, T3, T4, T5) were set up, and local suitable sowing dates were used as control (CK). The differences in dynamic changes in stem traits, population total stem number, leaf area index (LAI), and dry matter weight of wheat main stem tillers were compared among wheat of different sowing dates.【Results】 Compared with CK, the average evenness of main stem and tiller of ultra late sowing wheat decreased by 11.19% and 25.99%, the average plant height decreased by 5.35% and 6.70%, the total internode length decreased by 9.27% and 14.83%, the third internode length decreased by 18.05% and 22.18%, the fourth internode length decreased by 25.73% and 11.89%, and the evenness of each treatment, plant height, and internode length of ultra late sowing wheat were the smallest in T3 treatment; The average internode diameter of the main stem had almost no difference, and the average internode diameter of the tiller decreased by 7.05%. The diameter indexes of T3 treatment were larger than those of other ultra late sowing wheat treatments; The peak value of total stem number decreased by 20.26% compared to the peak value of CK, the peak value of leaf area index decreased by 28.79%, and the dry matter weight at maturity decreased by 17.01%. With the growth of ultra late sowing wheat, the total stem number was the highest in T1 and the lowest in T3, both of the leaf area index and the dry matter weight were T1>T4>T2>T5>T3.【Conclusion】 Compared with winter wheat sown at suitable time, the plant height and uniformity of ultra late sown wheat in northern Xinjiang decrease, the difference in internode diameter is small, the total stem number, leaf area index, and dry matter of the population significantly decrease, and the population quality is poor. Through comprehensive consideration, ultra-late sowing wheat should be sown from late October to early November when there is no snow or frozen soil in the field, the emergence rate is high, thus obtaining a more reasonable population. Table and Figures | Reference | Related Articles | Metrics | Comments（0）

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Analysis of the influence of different chemical treatments on the sealing effect of long staple cotton MA Hui, DAI Lu, LI Xingxing, Abuduaini Abuduweili, Aimaierjiang Abulitifu, TIAN Liwen, OU Huan Xinjiang Agricultural Sciences    2023, 60 (11): 2601-2608.   DOI: 10.6048/j.issn.1001-4330.2023.11.001 Abstract （190）   HTML （52）    PDF （889KB）（87）       Knowledge map    【Objective】 To study the effect of chemical detopping on long-fiber cotton in the hope of providing theoretical support for integration matching techniques of chemical detopping. 【Methods】 The tested long staple cotton variety is Xin 78,A complete randomized experiment design was used to analyze the effects of seven detopping treatments: “Yiding”, “Yiding”, “Xianglingzhuan”, “Shiyifu”, “Miandingfeng”, “Guoguangguandingtaocan” and Manual topping on influences of cotton plant height, yield and yield components, main fiber quality. At the same time, fuzzy comprehensive evaluation method base on entropy weight was applied to evaluate the 11 characters of each treatment.【Results】 The results showed that the plant height increment of pre and post the chemical detopping and artificial detopping treatments were 16.1-40.9 cm and 3.1 cm, respectively; “Yiding”treatent number of fruit branches pe cotton plant was compare with “Mianfengding”and Manual topping separately high 1.5units,1.8untits.boll number per plant of “Yiding” and “Yiding” treatments was significantly higher than those of “Shiyifu”, “Miandingfeng” and artificial detopping treatments, the boll weight of the “Shiyifu” treatment was significantly higher than that of the “Guoguangguandingtaocan” treatment by 0.23 g, lint percent of “Yiding” treatment was significantly higher than that of artificial detopping, “Yiding” and “Shiyifu” by 1.1, 1.2 and 1.3percentage points,the seed cotton yield of “Yiding” treatment was significantly higher than that of “Shiyifu”, artificial detopping and “Miandingfeng” treatment by 16.4%, 17.4% and 20.8%. The lint cotton yield of “Yiding” treatment was significantly higher than those of “Guoguangguandingtaocan”, “Xianglingzhuan”, “Shiyifu”, artificial detopping and “Miandingfeng” treatment by 15.4%, 16.0%, 20.8%, 21.2% and 22.9%, the strength and the length uniformity index had little difference, but it was significant for the micronaire value and length. The comprehensive evaluation of fuzzy method showed that the comprehensive performance of “Yiding”, “Yiding”, “Guoguangguandingtaocan” and “Xianglingzhuan” was better than artificial detopping.【Conclusion】 The plant height increment of chemical capping treatment is larger; chemical detpping has a significant effect on yield and yield components, micronaire value and length; “Yiding” treatment effect is the best, “Yiding”, “Guoguangguandingtaocan” and “Xianglingzhuan” treatment effect are second. Table and Figures | Reference | Related Articles | Metrics | Comments（0）

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Research progress on sex pheromone identification and application of Asian corn borer LAN Chenyihang, YAO Yubo, ZHOU Junxiang, FU Kaiyun, DING Xinhua, YIN Xiaohui, LIU Wen, WANG Na, GUO Wenchao, DENF Jianyu Xinjiang Agricultural Sciences    2023, 60 (7): 1614-1622.   DOI: 10.6048/j.issn.1001-4330.2023.07.007 Abstract （605）   HTML （12）    PDF （1026KB）（84）       Knowledge map    【Objective】 Reviewing the domestic and foreign research progress on sex pheromone identification, comprehensive prevention and control and application of Asian corn borer in recent years, in order to provide an important reference for the monitoring, early warning and green prevention and control of Asian corn borer in my country.【Methods】 Statistical methods were used to collect literature data, and the progress of domestic and foreign literature on the research and application of sex pheromone control technology of Asian corn borer was analyzed. 【Results】 The Asian corn borer is distributed in China, South Korea, Japan, the Philippines, etc. Females release sex pheromones to attract males and then mate;The main sex pheromone components of the Asian corn borer were identified at home and abroad as cis/trans-12 tetradecanol acetate (Z/E-12-14:Ac) and n-tetradecyl acetate (14:Ac). The effects of each component were different, and there were geographical population differences in the proportion of components; At present, the sex pheromone products of the Asian corn borer have been widely used in monitoring, mass trapping and mating interference, and the integrated technology combined with other control technologies also has significant control effects; There are many factors affecting the trapping efficiency of sex pheromone lures during the application process, including sex pheromone dosage, trap type, placement height, color and environment, etc. 【Conclusion】 The Asian corn borer is distributed in the corn planting areas of many countries. There are geographical population differences in the proportion of sex pheromone of the Asian corn borer. The best component system of sex pheromone, combined with various factors affecting the trapping efficiency of sex pheromones, has achieved good results in field prevention and control of the Asian corn borer. China has assembled and integrated a set of green control technology based on sex pheromone to prevent and control the Asian corn borer. Table and Figures | Reference | Related Articles | Metrics | Comments（0）

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Xinjiang Agricultural Sciences    2023, 60 (10): 0-0.   Abstract （80）      PDF （6202KB）（83）       Knowledge map    Related Articles | Metrics | Comments（0）

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Diversity evaluation of machine-picked agronomic traits in Gossypium barbadense L. germplasm resources HUANG Xinglei, WANG Weiran, WANG Meng, ZHU Jiahui, LIN Feng, QIN Guoli, YANG Jing, Alifu Aierxi, WU Quanzhong, KONG Jie Xinjiang Agricultural Sciences    2024, 61 (1): 1-8.   DOI: 10.6048/j.issn.1001-4330.2024.01.001 Abstract （617）   HTML （34）    PDF （970KB）（80）       Knowledge map    【Objective】 The agronomic characters of sea island cotton germplasm resources were analyzed in order to provide candidate materials for its parent selection and variety cultivation in the future. 【Methods】 125 sea island cotton germplasm resources with zero fruit branches were selected to analyze the coefficient of variation,genetic diversity,correlation,principal component and agronomic characters. 【Results】 Indicating that the 125 sea island cotton germplasm resources in this study had great differences and were rich in germplasm diversity.The coefficient of variation of 12 characters was between 3.54% and 23.85%,and the genetic diversity index between 1.96 and 2.10.The results of correlation analysis showed that there was an extremely significant positive correlation between plant height and initial fruit branch height,initial fruit branch node position and boll weight,extremely significant positive correlation between initial fruit branch height and initial fruit branch node position and boll weight,and extremely significant positive correlation between middle fruit branch length and middle fruit branch length. The length of the lower fruit branch and the angle between the lower fruit branch were significantly positively correlated,so it is necessary to consider each other and analyze comprehensively when cultivating cotton varieties picked by machine. By principal component analysis,the cumulative contribution rate of 12 agronomic characters divided into 6 principal components reached 78.59%,which were plant height factor,fruit branch factor,stem diameter factor,lint percentage factor,boll number factor and boll weight factor. The germplasm resources of sea island cotton were divided into five groups by cluster analysis. The fifth group showed good mechanical picking characters,and the representative varieties were Xinhai 43,Xinhai 55,Shihezi V7-4,K426,Xin78,16DJC01,Xinku K2442 and Xinku 198-1. 【Conclusion】 The 125 resources are rich in diversity,and the clustering analysis of the fifth group shoes that it has good machine-harvestability,and 21 breeding materials with good machine-harvestability were obtained,which could be used as the basic machine-picked materials. Table and Figures | Reference | Related Articles | Metrics | Comments（0）

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Identification and analysis of machine-picked agronomic characters of Gossypium hirsutum resource materials MA Qingshan, DU Xiao, TAO Zhixin, HAN Wanli, LONG Yilei, AI Xiantao, HU Shoulin Xinjiang Agricultural Sciences    2023, 60 (8): 1830-1839.   DOI: 10.6048/j.issn.1001-4330.2023.08.002 Abstract （154）   HTML （19）    PDF （1042KB）（77）       Knowledge map    【Objective】 The agronomic characters of machine-picked upland cotton resource materials were analyzed and identified, and the excellent cotton materials suitable for machine-picked cotton were selected.【Methods】 Variation analysis, correlation analysis, principal component analysis and cluster analysis were performed for 15 agronomic characters of 120 germplasm materials.【Results】 The variation analysis of 15 agronomic traits showed that the variation coefficients of the other agronomic traits were all greater than 5% except the growth period and chlorophyll SPAD value, which were 4.9% and 4.6%, respectively. The variation coefficient of total leaf was the largest, which was 47.7%. The growth period was positively correlated with the number of leaf branches, and negatively correlated with the number of effective fruit branches and coat fraction. Plant height was positively correlated with the height of initial node, the number of fruit branches, the number of effective fruit branches, the number of bolls per plant and chlorophyll SPAD value, and was negatively correlated with clothing fraction. The first node of fruit branch was positively correlated with the height of the first node of fruit branch, and negatively correlated with the number of fruit branch. The height of initial node of fruit branch was positively correlated with chlorophyll SPAD value. The boll number per plant was positively correlated with the number of fruit branches, the number of effective fruit branches, the number of leaf branches, the total number of leaves, the weight of single boll and the value of chlorophyll SPAD, and was negatively correlated with the content of clothes. 120 materials could be divided into 7 groups when Euclidean distance was 5, and each group had its own advantages. The group Ⅰ materials met the requirements of mechanical cotton harvesting except plant height, and the group Ⅱ, Ⅲ, Ⅳ materials met the requirements of mechanical cotton harvesting except that the growth period did not meet the ripness requirements. Five principal components were extracted by principal component analysis, with a cumulative contribution rate of 77.07%. most of the information of 12 quantitative agronomic traits of 120 cotton materials were explained. The first three principal components were boll number per plant, growth period and height of fruit branch beginning, and factor 4 and factor 5 were boll weight.【Conclusion】 Ten cotton materials were obtained,which can be used as reserve and excellent materials for cotton breeding by machine. Table and Figures | Reference | Related Articles | Metrics | Comments（0）

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Development of molecular markers for clubroot resistance and identification of germplasm resources for Brassica rapa ZHANG Liguo, GUO Chungui, CHANG Lichun, GUO Xinlei, ZHANG Tao, WU Jian, LIANG Jianli, GAO Jie, WANG Xiaowu Xinjiang Agricultural Sciences    2023, 60 (9): 2281-2290.   DOI: 10.6048/j.issn.1001-4330.2023.09.024 Abstract （154）   HTML （6）    PDF （854KB）（75）       Knowledge map    【Objective】 To develop KASP (Kompetitive Allele Specific PCR) marker for efficiently identifying CR (clubroot resistance) genes in cabbage B.rapa germplasms by using KASP markers to explore the distribution of clubroot resistant genes in germplasm collected with a large number of B.rapa accessions.【Methods】 Based on the information of cloned clubroot resistance genes previously, KASP markers were developed using Primer 3 and DNAMAN and the highly reliable markers were screened using a representative population containing 62 B.rapa varieties.Then, these available markers were used to genotype the 862 B.rapa resource population for disease resistance.【Results】 Based on four cloned disease resistance genes (CRa, CRb, CRd, Crr1a), six gene-specific KASP markers related to clubroot disease resistance were developed and screened.Among the 862 B.rapa germplasm accessions, 105 accessions containing clubroot resistance genes were identified.Turnip and turnip rape accounted for 70.48%.CRa was found to be the clubroot resistance gene carried by most accessions among B.rapa germplasm resources, which accounted for 58.09% of all disease resistant materials.Additionally, we found 16 accessions that contained two or more resistance genes.【Conclusion】 In this study, six stable and reliable gene-specific KASP markers were developed.CRa was found to be the clubroot resistance genes carried by most accessions among the four CR genes.Importantly, a few germplasm resources were identified that carried multiple clubroot resistance genes. Table and Figures | Reference | Related Articles | Metrics | Comments（0）

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Effect of subsoiling depth on canopy photosynthetic characteristics and yield of cotton MA Jun, WANG Jing, LI Chunyan, WANG Liang, SHI Weijun, CUI Jianping, TIAN Liwen, GUO Rensong Xinjiang Agricultural Sciences    2023, 60 (12): 2878-2884.   DOI: 10.6048/j.issn.1001-4330.2023.12.003 Abstract （227）   HTML （10）    PDF （1015KB）（75）       Knowledge map    【Objective】Under the natural ecological conditions in Xinjiang, the effects of subsoiling depth on photosynthetic characteristics of the cotton canopy and yield were investigated to provide the theoretical basis for further clarifying the regulation effect of subsoiling on cotton yield.【Methods】The Xinluzhong No.88 variety was used as the experimental material and four treatments, no subsoiling (CK), subsoiling 30 cm (S1), subsoiling 40 cm (S2), and subsoiling 50 cm (S3), were set up in the perennial tillage cotton field to examine the effects of different subsoiling depths on canopy structure, photosynthetic characteristics, dry matter accumulation and yield of cotton at key growth stages.【Results】The leaf area index and growth period of cotton showed a single peak curve, and the leaf area index reached the peak at the full flowering stage, where the leaf area index of subsoiling treatment increased by 0.92%-12.94% compared with CK.However, the trends of leaf inclination and the degree of canopy opening were opposite to that of the leaf area index, and the minimum value was found at the flowering stage.Compared with CK, the leaf inclination of subsoiling increased by 1.86%-5.29%, and the degree of canopy opening decreases by 32.7%-59.1%.The net photosynthetic rate at the early flowering stage increased with the depth of subsoiling, while the transpiration rate and stomatal conductance were the highest in S2.The net photosynthetic rate, transpiration rate, and stomatal conductance at full flowering and full boll stage were the highest in S2 and S3, respectively, while there was no significant difference between S2 and S3 (P>0.05).Compared with CK, the initial stage of rapid accumulation of dry matter in subsoiling treatment was 1-3 days earlier than that in CK, and the duration was extended to 2-4 days.The maximum accumulation rate increased by 2.18%-18.01%, the boll weight increased by 3.58%-9.12%, and the seed cotton yield increased by 11.02%-21.93%, among which subsoiling 40 cm is the highest.【Conclusion】The combination of subsoiling with a depth of 40 cm(S2) and conventional tillage can effectively improve cotton canopy structure, promote leaf photosynthesis, increase dry matter accumulation intensity of cotton, and increase seed cotton yield. Table and Figures | Reference | Related Articles | Metrics | Comments（0）

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Study on cotton formation and water salt transportation under salinization ZHONG Zhibo, HE Shuai, ZHANG Wanheng, ZHOU Jianwei, ZHENG Guoyu, MA Junyong, CHENG Hong, SHI Cong, ZHANG Xin Xinjiang Agricultural Sciences    2023, 60 (10): 2390-2395.   DOI: 10.6048/j.issn.1001-4330.2023.10.006 Abstract （1175）   HTML （14）    PDF （818KB）（73）       Knowledge map    【Objective】 To explore the law of water and salt movement in different salinized soil conditions in cotton seedling stage, and clarify the relationship between the seedling formation law of different cotton varieties and soil salinity,the results can provide a theoretical basis for cotton cultivation under salinization conditions.【Methods】 The main cotton varieties in southern Xinjiang Tahe 2, Xinluzhong 56, and Xinluzhong 87 were taken as the research object, a completely randomized pot experiment was arranged in 2021. Three salt gradients shall be set according to the national soil salinization classification standard: 3, 5 and 15 g/kg (designated as S1, S2 and S3 in turn), and the test soil was the original saline soil in Xiaohaizi irrigation area in southern Xinjiang.【Results】 (1) After a period of irrigation, under the condition of the soil salt content of 15 g/kg, the soil moisture content was higher than that of other treatments; (2) The salt content of 0-20 cm soil layer with different salinity treatment was significantly higher than that of 20-40 cm soil layer. With the increase of the initial salt content of the soil, the salt return to the surface layer increased; (3) According to the fitting equation, when the soil salt content of Tahe 2, Xinluzhong 56, and Xinluzhong 87 cotton reached 6.94, 7.04 and 7.09 g/kg, respectively, the number of adult seedlings was 0, which can be used as the salt resistance limit value of cotton in the seedling period.【Conclusion】 When the soil salt reaches the salt resistance limit value, soil permeability is weakened, salt aggravation seriously affects the cotton seedlings. It can be seen that the cotton seedling period responds significantly to the soil salinity, and the cotton planted in saline soil should be controlled by salt water, and soil salt content should be adjusted in time. Table and Figures | Reference | Related Articles | Metrics | Comments（0）