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DNA 甲基化控制脱落酸分解代谢响应光照调控草莓果实成熟。

DNA methylation controlling abscisic acid catabolism responds to light to mediate strawberry fruit ripening.

机构信息

College of Agriculture & Biotechnology, Zhejiang University, Zijingang Campus, Hangzhou, 310058, China.

Institute of Horticulture, Zhejiang Academy of Agricultural Sciences, Hangzhou, 310021, China.

出版信息

J Integr Plant Biol. 2024 Aug;66(8):1718-1734. doi: 10.1111/jipb.13681. Epub 2024 Jun 19.

Abstract

Phytohormones, epigenetic regulation and environmental factors regulate fruit ripening but their interplay during strawberry fruit ripening remains to be determined. In this study, bagged strawberry fruit exhibited delayed ripening compared with fruit grown in normal light, correlating with reduced abscisic acid (ABA) accumulation. Transcription of the key ABA catabolism gene, ABA 8'-hydroxylase FaCYP707A4, was induced in bagged fruit. With light exclusion whole genome DNA methylation levels were up-regulated, corresponding to a delayed ripening process, while DNA methylation levels in the promoter of FaCYP707A4 were suppressed, correlating with increases in transcript and decreased ABA content. Experiments indicated FaCRY1, a blue light receptor repressed in bagged fruit and FaAGO4, a key protein involved in RNA-directed DNA methylation, could bind to the promoter of FaCYP707A4. The interaction between FaCRY1 and FaAGO4, and an increased enrichment of FaAGO4 directed to the FaCYP707A4 promoter in fruit grown under light suggests FaCRY1 may influence FaAGO4 to modulate the DNA methylation status of the FaCYP707A4 promoter. Furthermore, transient overexpression of FaCRY1, or an increase in FaCRY1 transcription by blue light treatment, increases the methylation level of the FaCYP707A4 promoter, while transient RNA interference of FaCRY1 displayed opposite phenotypes. These findings reveal a mechanism by which DNA methylation influences ABA catabolism, and participates in light-mediated strawberry ripening.

摘要

植物激素、表观遗传调控和环境因素调节果实成熟,但它们在草莓果实成熟过程中的相互作用仍有待确定。在这项研究中,套袋草莓果实的成熟过程比正常光照下的果实延迟,这与脱落酸(ABA)积累减少有关。关键 ABA 分解代谢基因 ABA8'-羟化酶 FaCYP707A4 的转录在套袋果实中被诱导。在光照排除下,全基因组 DNA 甲基化水平上调,与延迟的成熟过程相对应,而 FaCYP707A4 启动子的 DNA 甲基化水平受到抑制,与转录物增加和 ABA 含量减少相对应。实验表明,在套袋果实中被抑制的蓝光受体 FaCRY1 和参与 RNA 指导的 DNA 甲基化的关键蛋白 FaAGO4 可以结合到 FaCYP707A4 的启动子上。FaCRY1 和 FaAGO4 之间的相互作用,以及在光照下生长的果实中 FaAGO4 向 FaCYP707A4 启动子的富集增加表明,FaCRY1 可能影响 FaAGO4 来调节 FaCYP707A4 启动子的 DNA 甲基化状态。此外,瞬时过表达 FaCRY1 或蓝光处理增加 FaCRY1 转录,会增加 FaCYP707A4 启动子的甲基化水平,而瞬时 RNA 干扰 FaCRY1 则表现出相反的表型。这些发现揭示了 DNA 甲基化影响 ABA 分解代谢的机制,并参与了光介导的草莓成熟过程。

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