Chitooligosaccharides and Arbuscular Mycorrhizal fungi alleviate the damage by Phytophthora nicotianae to tobacco seedlings by inducing changes in rhizosphere microecology
文献类型： 外文期刊
作者： Ma, Junqing 1 ; Li, Yang 1 ; Zhou, Heng 2 ; Qi, Lixin 3 ; Zhang, Zhifan 4 ; Zheng, Yanfen 1 ; Yu, Zheyan 5 ; Muhammad, Zeeshan 6 ; Yang, Xia 1 ; Xie, Yi 1 ; Chen, Qianru 1 ; Zou, Ping 1 ; Ma, Siqi 1 ; Li, Yiqiang 1 ; Jing, Changliang 1 ;
作者机构： 1.Chinese Acad Agr Sci, Tobacco Res Inst, Marine Agr Res Ctr, Qingdao 266101, Peoples R China
2.Yunnan Kunming Tobacco Co Ltd, Kunming 650400, Peoples R China
3.Weifang Inspect & Testing Ctr, Weifang 261399, Peoples R China
4.Guizhou Tobacco Co, Zunyi Branch, Zunyi 563000, Peoples R China
5.Qingdao Agr Univ, Coll Agron, Qingdao 266109, Peoples R China
6.South China Agr Univ, Natl Key Lab Green Pesticide, Guangzhou 510642, Peoples R China
关键词： Root exudates; Rhizosphere microecology; Black shank; Phytophthora nicotianae; Caprylic acid; Bacillus
期刊名称：PLANT PHYSIOLOGY AND BIOCHEMISTRY （ 影响因子：6.1； 五年影响因子：6.2 ）
ISSN： 0981-9428
年卷期： 2024 年 215 卷
页码：
收录情况： SCI
摘要： Arbuscular mycorrhizal fungi (AMF) and Chitooligosaccharide (COS) can increase the resistance of plants to disease. COS can also promote the symbiosis between AMF and plants. However, the effects of AMF & COS combined application on the rhizosphere soil microbial community of tobacco and the improvement of tobacco's resistance to black shank disease are poorly understood.& sdot;We treated tobacco with AMF, COS, and combined application of AMF & COS (AC), respectively. Then studied the incidence, physio-biochemical changes, root exudates, and soil microbial diversity of tobacco seedling that was inoculated with Phytophthora nicotianae. The antioxidant enzyme activity and root vigor of tobacco showed a regular of AC > AMF > COS > CK, while the severity of tobacco disease showed the opposite regular. AMF and COS enhance the resistance to black shank disease by enhancing root vigor, and antioxidant capacity, and inducing changes in the rhizosphere microecology of tobacco. We have identified key root exudates and critical soil microorganisms that can inhibit the growth of P. nicotianae. The presence of caprylic acid in root exudates and Bacillus (WdhR-2) in rhizosphere soil microorganisms is the key factor that inhibits P. nicotianae growth. AC can significantly increase the content of caprylic acid in tobacco root exudates compared to AMF and COS. Both AMF and COS can significantly increase the abundance of Bacillus in tobacco rhizosphere soil, but the abundance of Bacillus in AC is significantly higher than that in AMF and COS. This indicates that the combined application of AMF and COS is more effective than their individual use. These findings suggest that exogenous stimuli can induce changes in plant root exudates, regulate plant rhizosphere microbial community, and then inhibit the growth of pathogens, thereby improving plant resistance to diseases.
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