菌根诱导的 UDP-Glucosyl Transferase 负向调节丛枝菌根共生。

IF 6 1区 生物学 Q1 PLANT SCIENCES Plant, Cell & Environment Pub Date : 2024-10-28 DOI:10.1111/pce.15241
Jiadong Chen, QingChun Zhao, Kun Xie, Mengna Wang, Lechuan Li, Dechao Zeng, Qiuli Wang, Shuangshuang Wang, Aiqun Chen, Guohua Xu
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引用次数: 0

摘要

大多数陆生植物都能与丛枝菌根真菌(AM)建立互惠共生关系,以应对不利的环境压力。AM 共生关系的发展需要耗费大量能量,因此植物需要对其进行动态控制,以将共生关系维持在互利水平。最近从多个植物物种中发现了参与菌根自动调节(AOM)的多种成分;然而,AM共生的反馈调节机制在很大程度上仍不为人所知。在这里,我们报告了AM定殖促进了番茄(Solanum lycopersicum)黄酮醇生物合成途径,而AM特异性UDP-葡萄糖基转移酶SlUGT132(可能具有黄酮醇糖基化活性)负调控了AM的发育。SlUGT132主要在含有轴丝的细胞中表达,其敲除或敲除突变体的可溶性糖含量、根定殖水平和轴丝形成均有所增加。相反,过表达 SlUGT132 会导致可溶性糖含量和菌根化程度下降。代谢组学检测显示,在 Slugt132 菌根中,黄芪苷、桔梗苷和蛇床子苷的含量下降,但在 SlUGT132-过表达植物根中,这些黄酮苷的积累增加。我们的研究结果突显了一种新型的、由 SlUGT132 介导的 AOM 机制的存在,它能使植物灵活地控制菌根中可溶性糖和黄酮苷的积累,并调节菌根的定殖水平。
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A Mycorrhiza-Induced UDP-Glucosyl Transferase Negatively Regulates the Arbuscular Mycorrhizal Symbiosis.

Most terrestrial plants can establish a reciprocal symbiosis with arbuscular mycorrhizal (AM) fungi to cope with adverse environmental stresses. The development of AM symbiosis is energetically costly and needs to be dynamically controlled by plants to maintain the association at mutual beneficial levels. Multiple components involved in the autoregulation of mycorrhiza (AOM) have been recently identified from several plant species; however, the mechanisms underlying the feedback regulation of AM symbiosis remain largely unknown. Here, we report that AM colonization promotes the flavonol biosynthesis pathway in tomato (Solanum lycopersicum), and an AM-specific UDP-glucosyltransferase SlUGT132, which probably has the flavonol glycosylation activity, negatively regulates AM development. SlUGT132 was predominantly expressed in the arbuscule-containing cells, and its knockout or knockdown mutants showed increased soluble sugar content, root colonization level and arbuscule formation. Conversely, overexpression of SlUGT132 resulted in declined soluble sugar content and mycorrhization degree. Metabolomic assay revealed decreased contents of astragalin, tiliroside and cynaroside in slugt132 mycorrhizal roots, but increased accumulation of these flavonoid glycosides in SlUGT132-overexpressing plant roots. Our results highlight the presence of a novel, SlUGT132-mediated AOM mechanism, which enable plants to flexibly control the accumulation of soluble sugars and flavonoid glycosides in mycorrhizal roots and modulate colonization levels.

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来源期刊
Plant, Cell & Environment
Plant, Cell & Environment 生物-植物科学
CiteScore
13.30
自引率
4.10%
发文量
253
审稿时长
1.8 months
期刊介绍: Plant, Cell & Environment is a premier plant science journal, offering valuable insights into plant responses to their environment. Committed to publishing high-quality theoretical and experimental research, the journal covers a broad spectrum of factors, spanning from molecular to community levels. Researchers exploring various aspects of plant biology, physiology, and ecology contribute to the journal's comprehensive understanding of plant-environment interactions.
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