A plant growth-promoting bacteria Priestia megaterium JR48 induces plant resistance to the crucifer black rot via a salicylic acid-dependent signaling pathway

被引：16
作者：
Li, Qi [1 ,2 ]
Hou, Zhaoqi [1 ,2 ]
Zhou, Dongqin [1 ,2 ]
Jia, Mingyun [1 ,2 ]
Lu, Shipeng [1 ,2 ]
Yu, Jinping [1 ,2 ]
机构：
[1] Inst Bot, Jiangsu Key Lab Res & Utilizat Plant Resources, Nanjing, Jiangsu, Peoples R China
[2] Chinese Acad Sci, Nanjing Bot Garden Mem Sun Yat Sen, Nanjing, Peoples R China
来源：
FRONTIERS IN PLANT SCIENCE | 2022年 / 13卷
基金：
中国国家自然科学基金;
关键词：
JR48; plant resistance; crucifer black rot; Xcc; salicylic acid; BACILLUS; STRAINS; DEFENSE; RANGE;
D O I：
10.3389/fpls.2022.1046181
中图分类号：
Q94 [植物学];
学科分类号：
071001 ;
摘要：
Xanthomonas campestris pv. campestris (Xcc)-induced black rot is one of the most serious diseases in cruciferous plants. Using beneficial microbes to control this disease is promising. In our preliminary work, we isolated a bacterial strain (JR48) from a vegetable field. Here, we confirmed the plant-growth-promoting (PGP) effects of JR48 in planta, and identified JR48 as a Priestia megaterium strain. We found that JR48 was able to induce plant resistance to Xcc and prime plant defense responses including hydrogen peroxide (H2O2) accumulation and callose deposition with elevated expression of defense-related genes. Further, JR48 promoted lignin biosynthesis and raised accumulation of frees salicylic acid (SA) as well as expression of pathogenesis-related (PR) genes. Finally, we confirmed that JR48-induced plant resistance and defense responses requires SA signaling pathway. Together, our results revealed that JR48 promotes plant growth and induces plant resistance to the crucifer black rot probably through reinforcing SA accumulation and response, highlighting its potential as a novel biocontrol agent in the future.
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页数：14
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