Pochonia chlamydosporia Isolate PC-170-Induced Expression of Marker Genes for Defense Pathways in Tomatoes Challenged by Different Pathogens

文献类型： 外文期刊

第一作者： Zhuang, Xia

作者： Zhuang, Xia;Bai, Miao;Li, Yan-Lin;Yang, Guo-Shun;Zhuang, Xia;Zhao, Jian-Long;Ping, Xing-Xing;Yang, Yu-Hong;Mao, Zhen-Chuan;Xie, Bing-Yan

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关键词： induced defenses; jasmonic acid (JA); Pochonia chlamydosporia; pathogen; root endophytes; salicylic acid (SA)

期刊名称：MICROORGANISMS （ 影响因子：4.128； ）

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年卷期： 2021 年 9 卷 9 期

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收录情况： SCI

摘要： Pochonia chlamydosporia is a fungal parasite of nematode eggs. Studies have shown that some strains of Pochonia chlamydosporia can promote plant growth and induce plants' systemic resistance to root-knot nematodes by colonizing in their roots. This study aimed to verify the effect of the PC-170 strain on tomato growth and systemic resistance. Split-root experiments were conducted to observe the systemic resistance induced by PC-170. To explore the defense pathway that was excited due to the colonization by PC-170, we tested the expression of marker genes for defense pathways, and used mutant lines to verify the role of plant defense pathways. Our results showed that PC-170 can colonize roots, and promotes growth. We found a role for jasmonic acid (JA) in modulating tomato colonization by PC-170. PC-170 can activate tomato defense responses to reduce susceptibility to infection by the root-knot nematode Meloidogyne incognita, and induced resistance to some pathogens in tomatoes. The marker genes of the defense pathway were significantly induced after PC-170 colonization. However, salicylic acid (SA)- and jasmonic acid (JA)-dependent defenses in roots were variable with the invasion of different pathogens. Defense pathways play different roles at different points in time. SA- and JA-dependent defense pathways were shown to cross-communicate. Different phytohormones have been involved in tomato plants' responses against different pathogens. Our study confirmed that adaptive JA signaling is necessary to regulate PC-170 colonization and induce systemic resistance in tomatoes.

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