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首页> 外文期刊>Journal of Experimental Botany >Late activation of the 9-oxylipin pathway during arbuscular mycorrhiza formation in tomato and its regulation by jasmonate signalling
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Late activation of the 9-oxylipin pathway during arbuscular mycorrhiza formation in tomato and its regulation by jasmonate signalling

机译：番茄丛枝菌根形成过程中9-氧化脂途径的后期激活及其茉莉酸酯信号的调控

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摘要

The establishment of an arbuscular mycorrhizal (AM) symbiotic interaction is a successful strategy for the promotion of substantial plant growth, development, and fitness. Numerous studies have supported the hypothesis that plant hormones play an important role in the establishment of functional AM symbiosis. Particular attention has been devoted to jasmonic acid (JA) and its derivates, which are believed to play a major role in AM symbiosis. Jasmonates belong to a diverse class of lipid metabolites known as oxylipins that include other biologically active molecules. Recent transcriptional analyses revealed up-regulation of the oxylipin pathway during AM symbiosis in mycorrhizal tomato roots and indicate a key regulatory role for oxylipins during AM symbiosis in tomato, particularly those derived from the action of 9-lipoxygenases (9-LOXs). Continuing with the tomato as a model, the spatial and temporal expression pattern of genes involved in the 9-LOX pathway during the different stages of AM formation in tomato was analysed. The effects of JA signalling pathway changes on AM fungal colonization were assessed and correlated with the modifications in the transcriptional profiles of 9-LOX genes. The up-regulation of the 9-LOX oxylipin pathway in mycorrhizal wild-type roots seems to depend on a particular degree of AM fungal colonization and is restricted to the colonized part of the roots, suggesting that these genes could play a role in controlling fungal spread in roots. In addition, the results suggest that this strategy of the plant to control AM fungi development within the roots is at least partly dependent on JA pathway activation.
机译：建立丛枝菌根（AM）共生相互作用是促进植物大量生长，发育和适应的成功策略。许多研究支持以下假设，即植物激素在功能性AM共生的建立中起着重要作用。茉莉酸（JA）及其衍生物被特别关注，据认为在茉莉酸共生中起主要作用。茉莉酸酯属于称为脂质脂的多种脂质代谢产物，包括其他生物活性分子。最近的转录分析显示，菌根番茄根在AM共生过程中，oxylipin通路上调，并表明番茄AM共生过程中，oxylipins的关键调节作用，特别是9-脂氧合酶（9-LOXs）的作用。继续以番茄为模型，分析了番茄AM形成不同阶段9-LOX途径中涉及的基因的时空表达模式。评估了JA信号通路变化对AM真菌定殖的影响，并将其与9-LOX基因转录谱的修饰相关。菌根野生型根中9-LOX氧化脂途径的上调似乎取决于特定程度的AM真菌定植，并且仅限于根的定植部分，表明这些基因可能在控制真菌中发挥作用扎根。另外，结果表明该植物控制根内AM真菌生长的策略至少部分取决于JA途径的活化。

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