Signaling pathways driving the development of ectomycorrhizal symbiosis
Signaling pathways driving the development of ectomycorrhizal symbiosis
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DOI：
10.1002/9781118951446.ch9
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发表时间：
2016-10
期刊：
影响因子：
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通讯作者：
Yohann Daguerre;J. Plett;C. Veneault-Fourrey
中科院分区：
文献类型：
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作者：
Yohann Daguerre;J. Plett;C. Veneault-Fourrey
本章介绍了有关促进和介导外生菌根 (ECM) 建立的早期步骤的信号分子和推定受体的最新知识。它强调基于激素和基于共生效应子的对话，并解释了 ECM 菌丝如何在宿主根部增殖而不引起植物防御。 ECM 互利发育所需的宿主基因仍然未知，因为模型植物是多年生树木，更难以处理。共生界面的构建需要真菌蛋白的分泌，例如疏水蛋白和质外菌根诱导的小分泌蛋白（MiSSP），以及细胞壁重塑。希帕福林很可能是一种生长素模拟物，由真菌菌丝分泌，被植物根部吸收，进入根细胞，并与植物产生的生长素竞争生长素结合蛋白和受体。本章提出真菌定植首先触发生长素信号通路和生长素反应，例如根生长停滞和细胞径向伸长。
This chapter presents the current knowledge on signal molecules and putative receptors that promote and mediate the very early steps of ectomycorrhizal (ECM) establishment. It emphasizes both the hormone‐based and symbiosis effector‐based dialogues, and explains how ECM hyphae can proliferate in host roots without eliciting plant defenses. Host genes that are required for ECM mutualistic development are still unknown, as the model plants are perennial trees and more difficult to handle. Construction of symbiotic interface requires secretion of fungal proteins, such as hydrophobins and apoplastic Mycorrhiza‐induced Small Secreted Proteins (MiSSPs), and cell wall remodeling. It is probable that hypaphorine acts as an auxin‐mimic that is secreted from fungal hyphae, absorbed by the plant root where it enters root cells, and competes with plant‐produced auxins for auxin‐binding proteins and receptors. The chapter proposes that fungal colonization first triggers auxin‐signaling pathway and auxin responses, such as root growth arrest and cell radial elongation.