新疆农业科学 ›› 2022, Vol. 59 ›› Issue (10): 2538-2545.DOI: 10.6048/j.issn.1001-4330.2022.10.023
• 植物保护·微生物·农业生态环境·畜牧兽医 • 上一篇 下一篇
鲁晏宏1,2(), 郝金辉1,2, 詹发强2, 王宁2, 侯新强2, 杨蓉2, 包慧芳2(), 龙宣杞2()
收稿日期:
2021-12-23
出版日期:
2022-10-20
发布日期:
2022-12-21
通信作者:
包慧芳,龙宣杞
作者简介:
鲁晏宏(1996-),女,黑龙江人,硕士研究生,研究方向为微生物资源与利用,(E-mail)luyanhong@stu.xju.edu.cn
基金资助:
LU Yanhong1,2(), HAO Jinhui1,2, ZHAN Faqiang2, WANG Ning2, HOU Xinqiang2, YANG Rong2, BAO Huifang2(), LONG Xuanqi2()
Received:
2021-12-23
Online:
2022-10-20
Published:
2022-12-21
Correspondence author:
BAO Huifang, LONG Xuanqi
Supported by:
摘要:
【目的】从香梨树体中筛选出对香梨采后黑斑病病原菌具有拮抗作用的内生菌,为香梨采后生物保鲜奠定基础。【方法】采用组织分离法,对香梨采后黑斑病病原菌及梨树内生菌进行分离,采用ITS基因与16S rRNA基因引物分别对分离出的病原菌和拮抗菌进行测序,采用平板对峙法测定内生菌的拮抗效果,并对拮抗效果优良的拮抗菌采用离体果实进行防效测定。【结果】分离得到香梨采后黑斑病病害病原菌1株,鉴定为Alternatia alternata XL2。从梨树叶片及枝条中分离出内生菌16株,其中8株对Alternatia alternata XL2有抑制作用,8株拮抗菌均为芽孢杆菌属,分别为Bacillus velezensis 5株、Bacillus paralicheniformis 、Bacillus siamensis 和Bacillus tequilensis 各1株,牛津杯琼脂扩散实验中Bacillus velezensis NY2、NY7抑菌效果最佳,其次为NY15,抑菌圈直径均可达20 mm以上。离体果实抑菌实验中短期效果最佳的为NY2,使用第4 d时抑菌率可达80%以上,中长期效果较佳的为NY11,使用第7 d天时仍可达20%以上。【结论】筛选获得2株优良的香梨采后黑斑病拮抗菌。
中图分类号:
鲁晏宏, 郝金辉, 詹发强, 王宁, 侯新强, 杨蓉, 包慧芳, 龙宣杞. 香梨黑斑病病原菌分离及拮抗菌筛选鉴定[J]. 新疆农业科学, 2022, 59(10): 2538-2545.
LU Yanhong, HAO Jinhui, ZHAN Faqiang, WANG Ning, HOU Xinqiang, YANG Rong, BAO Huifang, LONG Xuanqi. Isolation of Pathogenic Bacteria and Screening and Identification of Antagonistic Bacteria of Black Spot of Fragrant pear[J]. Xinjiang Agricultural Sciences, 2022, 59(10): 2538-2545.
图1 病原菌分离及回接 注:(a)XL1病原菌菌株平板内形态为(b)XL2病原菌菌株平板内形态(c)XL2回接发病图(d)XL2感染病原菌香梨纵切图(e)XL3病原菌菌株平板内形态为(f)XL3回接发病图 (g)XL3感染病原菌香梨纵切图
Fig.1 Isolation and reinoculated symptoms of pathogenic bacteria Note:(a) the morphology of XL1 pathogen strain in the plate (b) the morphology of XL2 pathogen strain in the plate (c) the incidence diagram of XL2 back-graft (d) the slitting diagram of XL2 infected pathogen fragrant pear(e) The morphology of XL3 pathogen strains in the plate (F) the incidence diagram of XL3 tie-back (G) the slitting diagram of XL3 infection pathogen fragrant pear
图3 基于16S rRNA基因序列采用Neighbor-Joining法构建病原菌系统发育树 注:分支上的数字为Bootstrap值,表示构建系统进化树时计算1000次时形成该节点的百分比,只显示大于50%的的值;括号内数值为GenBank登录号;标尺0.1代表10%的16S r RNA基因序列的进化差异。
Fig.3 Phylogenetic tree based on Neighbor-Joining of isolated strain XL2 Note:The bootstrap values(%) presented at the branches were calculated from 1000 replications,only showing bootstrap values higher than 50%.Numbers in parentheses are GenBank accession numbers;The scale bar 0.1 represents 100 nucleotide substitutions per 1000 nucleotides.
菌株编号 Strain No. | 抑菌圈直径 Diameter of inhibition zone(mm) |
---|---|
NY1 | 10.33±1.53d |
NY2 | 23.43±0.51a |
NY5 | 14.67±0.58c |
NY7 | 23.33±0.58a |
NY9 | 13.33±1.15c |
NY10 | 9.33±0.58d |
NY11 | 14.33±1.41c |
NY15 | 21.73±0.25b |
表1 拮抗菌发酵液对链格孢抑菌效果
Table1 Oxford cup AGAR diffusion inhibition results
菌株编号 Strain No. | 抑菌圈直径 Diameter of inhibition zone(mm) |
---|---|
NY1 | 10.33±1.53d |
NY2 | 23.43±0.51a |
NY5 | 14.67±0.58c |
NY7 | 23.33±0.58a |
NY9 | 13.33±1.15c |
NY10 | 9.33±0.58d |
NY11 | 14.33±1.41c |
NY15 | 21.73±0.25b |
图6 基于16S rRNA基因序列采用Neighbor-joining法构建的拮抗菌系统发育树 注:分支上的数字为Bootstrap值,表示构建系统进化树时计算1000次时形成该节点的百分比,只显示大于50%的的值;括号内数值为GenBank登录号;标尺0.1代表10%的16S r RNA基因序列的进化差异。
Fig.6 Phylogenetic tree based on Neighbor-joining of isolated antagonistic bacteria Note:The bootstrap values(%) presented at the branches were calculated from 1000 replications,only showing bootstrap values higher than 50%.Numbers in parentheses are GenBank accession numbers;The scale bar 0.1 represents 100 nucleotide substitutions per 1000 nucleotides.
菌株编号 Strain No. | 防效Control effect(%) |
---|---|
NY1 | 11.71±0.55c |
NY2 | 31.30±1.19a |
NY5 | 15.24±2.37c |
NY7 | 12.95±2.67c |
NY9 | 4.30±0.21d |
NY10 | 13.52±1.15c |
NY11 | 21.72±2.98b |
NY15 | 24.49±2.48b |
表2 发酵液在库尔勒香梨对病原菌抑制率
Table 2 Inhibitory rate of pathogenic bacteria in Korla fragrant pear
菌株编号 Strain No. | 防效Control effect(%) |
---|---|
NY1 | 11.71±0.55c |
NY2 | 31.30±1.19a |
NY5 | 15.24±2.37c |
NY7 | 12.95±2.67c |
NY9 | 4.30±0.21d |
NY10 | 13.52±1.15c |
NY11 | 21.72±2.98b |
NY15 | 24.49±2.48b |
图7 香梨抑菌测定复测 注:标有*表示与其余组差异显著(P<0.05)
Fig.7 The bacteriostatic rate of fragrant pear was determined Note:Marked with * indicates significant difference with other groups (P<0.05)
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