外源褪黑素对盐胁迫下棉花幼苗生长及光合特性的影响

doi:10.6048/j.issn.1001-4330.2021.08.006

新疆农业科学 ›› 2021, Vol. 58 ›› Issue (8): 1418-1426.DOI: 10.6048/j.issn.1001-4330.2021.08.006

• 棉花化肥农药减施专栏 • 上一篇下一篇

外源褪黑素对盐胁迫下棉花幼苗生长及光合特性的影响

李阳^1,2, 陈静², 刘绍东², 沈倩², 张思平², 葛常伟², 刘瑞华², 马慧娟², 万素梅¹, 庞朝友²

1.塔里木大学植物科学学院,新疆阿拉尔 843300;
2.棉花生物学国家重点实验室中国农业科学院棉花研究所,河南安阳 455000

收稿日期:2021-02-07 出版日期:2021-08-20 发布日期:2021-08-09
通信作者: 万素梅(1968-),女,河南商丘人,教授,博士,研究方向为旱区农业资源管理及高效农作制度,(E-mail)wansumei510@163.com
庞朝友(1979-),男,河北邯郸人,博士,博士生导师,研究方向为棉花抗逆机制,(E-mail)chyp@163.com
作者简介:李阳(1991-),女,河南安阳人,硕士研究生,研究方向为作物高产,(E-mail)liyangzmr@163.com
基金资助:
中国农业科学院科技创新(CAAS-ASTIP-2020-ICR)

Effects of Exogenous Melatonin on Growth and Photosynthetic Characteristics of Cotton Seedlings under Salt Stress

LI Yang^1,2, CHEN Jing², LIU Shaodong², SHEN Qian², ZHANG Siping², GE Changwei², LIU Ruihua², MA Huijuan², WAN Sumei¹, PANG Chaoyou²

1. College of Plant Sciences, Tarim University, Aral Xinjiang 843300, China;
2. State Key Laboratory of Cotton Biology/Institute of Cotton Research of Chinese Academy of Agricultural Sciences, Anyang Henan 455000, China

Received:2021-02-07 Online:2021-08-20 Published:2021-08-09
Correspondence author: WAN Sumei(1968-), female, native place: Shangqiu Henan. Doctor, professor, Research direction is agricultural resource management and efficient farming system in arid areas, (E-mail) wansumei510@163.com
PANG Chaoyou(1979-), male, Handan, Hebei Doctor, professor, Research direction is research on the resistance mechanism of cotton, (E-mail) chyp@163.com
Supported by:
Science and Technology Innovation Project of Chinese Academy of Agricultural Sciences(CAAS-ASTIP-2020-ICR)

摘要/Abstract

摘要： 【目的】土壤盐渍化严重制约棉花幼苗生长,褪黑素(Melatonin,MT)能有效调控植物在盐胁迫下的生长机制。研究外源褪黑素对盐胁迫下棉花幼苗生长及光合特性的影响。【方法】采用对棉花幼苗叶面喷施外源褪黑素的方法,分析外源褪黑素在NaCl胁迫下棉花幼苗生长及光合系统的响应,筛选出最适喷施褪黑素浓度。以新陆中70号为材料,设置不同褪黑素浓度(25、50、100、200 μmol/L)处理,测定NaCl胁迫下不同时间段(1、3、6和9 d)棉花幼苗生长指标及叶片荧光、光合作用参数等指标。【结果】NaCl胁迫显著降低棉花幼苗株高、叶片光合、荧光指标,喷施外源褪黑素后,促进株高生长及干物质质量的增加,并有效缓解了NaCl胁迫对棉花幼苗叶片净光合速率、气孔导度、最大光化学效率、PSⅡ有效光量子产量、光化学猝灭等指标的影响,减少NaCl胁迫对棉花幼苗的损伤。【结论】NaCl胁迫条件下,外源褪黑素能有效促进棉花幼苗生长,喷施100 μmol/L褪黑素浓度处理效果最佳。

关键词: 棉花幼苗; 褪黑素; 盐胁迫; 光合特性

Abstract: 【Objective】 Soil salinization seriously affects the growth of cotton seedlings, and Melatonin (MT) plays an important role in regulating the salt tolerance of plants. In this study, the method of spraying exogenous melatonin on the leaf surface of cotton seedlings was used to explore the response of exogenous melatonin to cotton seedling growth and photosynthetic system under NaCl stress, and to screen out the most suitable spraying melatonin concentration. Effects of Exogenous Melatonin on Growth and Photosynthetic Characteristics of Cotton Seedlings under Salt Stress. 【Methods】 Xinluzhong 70 was taken as the material, and different melatonin concentrations (25, 50, 100, 200 μmol/L) treatment were set tp measure cotton seedling growth indexes, leaf fluorescence, photosynthesis parameters and other indexes in different time periods (1, 3, 6, 9 d) under NaCl stress. 【Results】 NaCl stress significantly reduced plant height, leaf photosynthesis and fluorescence indexes of cotton seedlings after spraying melatonin and the plant height and dry matter quality of cotton seedlings were increased. Furthermore, the effects of NaCl stress on the net photosynthetic rate, stomatal conductance, maximum photochemical efficiency, PSII effective photon yield, photochemical quenching and other indicators of cotton seedling leaves were effectively alleviated and the damage of NaCl stress to cotton seedlings was also reduced. 【Conclusion】 The results showed that under NaCl stress spraying exogenous melatonin can effectively promote the growth of cotton seedlings, and spraying 100 μmol/L melatonin concentration has the best result.

Key words: cotton seedling; melatonin; salt stress; photosynthetic characteristics

中图分类号:

S562

李阳, 陈静, 刘绍东, 沈倩, 张思平, 葛常伟, 刘瑞华, 马慧娟, 万素梅, 庞朝友. 外源褪黑素对盐胁迫下棉花幼苗生长及光合特性的影响[J]. 新疆农业科学, 2021, 58(8): 1418-1426.

LI Yang, CHEN Jing, LIU Shaodong, SHEN Qian, ZHANG Siping, GE Changwei, LIU Ruihua, MA Huijuan, WAN Sumei, PANG Chaoyou. Effects of Exogenous Melatonin on Growth and Photosynthetic Characteristics of Cotton Seedlings under Salt Stress[J]. Xinjiang Agricultural Sciences, 2021, 58(8): 1418-1426.

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外源褪黑素对盐胁迫下棉花幼苗生长及光合特性的影响

Effects of Exogenous Melatonin on Growth and Photosynthetic Characteristics of Cotton Seedlings under Salt Stress

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