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首页> 外文期刊>Current Biology: CB >A secreted fungal effector of Glomus intraradices promotes symbiotic biotrophy.
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A secreted fungal effector of Glomus intraradices promotes symbiotic biotrophy.

机译：Glomus intraradices 的一种分泌性真菌效应物可促进共生生物营养。

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摘要

Biotrophic fungi interacting with plants establish long-term relationships with their hosts to fulfill their life cycles. In contrast to necrotrophs, they need to contend with the defense mechanisms of the plant to develop within the host and feed on living cells [1]. It is generally accepted that microbial pathogens produce and deliver a myriad of effector proteins to hijack the cellular program of their hosts [[1], [2], [3], [4] and [5]]. Arbuscular mycorrhizal (AM) fungi are the most widespread biotrophs of plant roots [6]. We investigated whether AM fungi use effector proteins to short-circuit the plant defense program. Here we show that Glomus intraradices secretes a protein, SP7, that interacts with the pathogenesis-related transcription factor ERF19 in the plant nucleus. ERF19 is highly induced in roots by the fungal pathogen Colletotrichum trifolii as well as by several fungal extracts, but only transiently during mycorrhiza colonization. When constitutively expressed in roots, SP7 leads to higher mycorrhization while reducing the levels of C. trifolii-mediated defense responses. Furthermore, expression of SP7 in the rice blast fungus Magnaporthe oryzae attenuates root decay symptoms. Taken together, these results suggest that SP7 is an effector that contributes to develop the biotrophic status of AM fungi in roots by counteracting the plant immune program.
机译：与植物相互作用的生物营养性真菌与其宿主建立了长期关系，以实现其生命周期。与坏死菌相反，它们需要与植物的防御机制竞争才能在宿主内发育并以活细胞为食[1]。人们普遍认为微生物病原体会产生并释放无数种效应蛋白，以劫持其宿主的细胞程序[[1]，[2]，[3]，[4]和[5]。丛枝菌根（AM）真菌是植物根系最普遍的生物营养型[6]。我们调查了AM真菌是否使用效应蛋白来缩短植物防御程序。在这里，我们显示 Glomus intraradices 分泌一种蛋白SP7，该蛋白与植物细胞核中与发病相关的转录因子ERF19相互作用。真菌病原体 Colletotrichum trifolii 以及几种真菌提取物可在根部高度诱导 ERF19 ，但仅在菌根定植过程中短暂诱导。当在根中组成性表达时， SP7 会导致更高的菌根生长，同时降低 C的水平。三叶草介导的防御反应。此外， SP7 在稻瘟病菌 Magnaporthe oryzae 中的表达减弱了根腐病症状。综上所述，这些结果表明SP7是一种效应物，其通过抵消植物的免疫程序而促进了根部AM真菌的生物营养状态。

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