ABSTRACT Arbuscular mycorrhiza (AM) is a symbiotic interaction in terrestrial plants that is colonized by fungi in the Glomeromycotina. The morphological types of AM, including the Arum-type and Paris-type, are distinct, depending on the host plant species. A part of the regulatory pathways in Arum-type AM symbiosis has been revealed because most model plants form the Arum-type AM with a model AM fungus, Rhizophagus irregularis. Moreover, gibberellin (GA) is known to severely inhibit AM fungal colonization in Arum-type AM symbiosis. Recently, we showed that exogenous GA treatment significantly promoted AM fungal colonization in Paris-type AM symbiosis in Eustoma grandiflorum. In this study, we focused on the transcriptional changes in AM symbiosis-related genes in GA-treated E. grandiflorum. The expression levels of all examined E. grandiflorum genes were maintained or increased by GA treatment compared with those of the control treatment. Our new results suggest that signaling pathway(s) required for establishing AM symbiosis in E. grandiflorum may be distinct from the well-characterized pathway for that in model plants.

中文翻译：

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赤霉素对洋桔梗巴黎型丛枝菌根共生体共生相关基因表达的影响

摘要丛枝菌根 (AM) 是陆生植物中的一种共生相互作用，被真菌定植于球藻纲中。AM 的形态类型，包括阿鲁姆型和巴黎型，根据寄主植物种类的不同而不同。已经揭示了 Arum 型 AM 共生中的一部分调节途径，因为大多数模型植物与模型 AM 真菌 Rhizophagus normis 形成 Arum 型 AM。此外，已知赤霉素 (GA) 会严重抑制 Arum 型 AM 共生中的 AM 真菌定植。最近，我们发现外源 GA 处理显着促进了桔梗巴黎型 AM 共生中 AM 真菌的定植。在这项研究中，我们专注于 GA 处理的 E.grandiflorum 中 AM 共生相关基因的转录变化。所有检查的 E 的表达水平。与对照处理相比，GA 处理维持或增加了大花基因。我们的新结果表明，在 E. Grandiflorum 中建立 AM 共生所需的信号通路可能与模型植物中已充分表征的通路不同。