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Promotion of Arabidopsis immune responses by a rhizosphere fungus via supply of pipecolic acid to plants and selective augment of phytoalexins

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Science China(Life Sciences) 2023年第5期66卷 1119-1133页

作者： Feifei Luo Guirong Tang Song Hong Tianyu Gong Xiu-Fang Xin Chengshu Wang Key Laboratory of Insect Developmental and Evolutionary Biology CAS Center for Excellence in Molecular Plant SciencesShanghai Institute of Plant Physiology and EcologyChinese Academy of SciencesShanghai 200032China CAS Center for Excellence in Biotic Interactions University of Chinese Academy of SciencesBeijing 100049China National key Laboratory of plant Molecular Genetics CAS Center for Excellence in Molecular Plant SciencesShanghai Institute of Plant Physiology and EcologyChinese Academy of SciencesShanghai 200032China School of Life Science and Technology ShanghaiTech UniversityShanghai 201210China

The ascomycete insect pathogenic fungi such as Metarhizium species have been demonstrated with the abilities to form the rhizosphere or endophytic relationships with different plants for nutrient exchanges.In this study,after the evident infeasibility of bacterial disease development in the boxed sterile soils,we established a hydroponic system for the gnotobiotic growth of Arabidopsis thaliana with the wild-type and transgenic strain of Metarhizium robertsii.The transgenic fungus could produce a high amount of pipecolic acid(PIP),a pivotal plant-immune-stimulating metabolite.Fungal inoculation experiments showed that M.robertsii could form a non-selective rhizosphere relationship with Arabidopsis.Similar to the PIP uptake by plants after exogenous application,PIP level increased in Col-0 and could be detected in the PIP-non-producing Arabidopsis mutant(ald1)after fungal inoculations,indicating that plants can absorb the PIP produced by fungi.The transgenic fungal strain had a better efficacy than the wild type to defend plants against the bacterial pathogen and aphid attacks.Contrary to ald1,fmo1 plants could not be boosted to resist bacterial infection after treatments.After fungal inoculations,the phytoalexins camalexin and aliphatic glucosinolate were selectively increased in Arabidopsis via both PIP-dependent and-independent ways.This study unveils the potential mechanism of the fungus-mediated beneficial promotion of plant immunity against biological stresses.The data also highlight the added values of M.robertsii to plants beyond the direct suppression of insect pest populations.

关键词： Metarhizium robertsi rhizosphere fungus pipecolic acid camalexin aliphatic glucosinolate plant defenses

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Signaling Mechanisms in Pattern-Triggered Immunity （PTI）

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Molecular plant 2015年第4期8卷 521-539页

作者： Jean Bigeard Jean Colcombet Heribert Hirt Unite de Recherche en Genomique Vegetale (URGV) UMR INRA/CNRS/Universite d'Evry Val d'Essonne/Saclay Plant Sciences 2 rue Gaston Cremieux 91057 Evry France Center for Desert Agriculture 4700 King Abdullah University of Science and Technology (KAUST) Thuwa123955-6900 Kingdom of Saudi Arabia

In nature, plants constantly have to face pathogen attacks. However, plant disease rarely occurs due to efficient immune systems possessed by the host plants. Pathogens are perceived by two different recognition systems that initiate the so-called pattern-triggered immunity （PTI） and effector-triggered immunity （ETI）, both of which are accompanied by a set of induced defenses that usually repel pathogen attacks. Here we discuss the complex network of signaling pathways occurring during PTI, focusing on the involvement of mitogen-activated protein kinases.

关键词： plant defenses plant immunity PTI signaling mechanisms MAPKs

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