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1-甲基环丙烯(1-MCP)和乙烯处理对猕猴桃果实成熟影响的转录组分析

Transcriptomic analysis of effects of 1-methylcyclopropene (1-MCP) and ethylene treatment on kiwifruit () ripening.

作者信息

Choi Dasom, Choi Jeong Hee, Park Kee-Jai, Kim Changhyun, Lim Jeong-Ho, Kim Dong-Hwan

机构信息

Department of Plant Science and Technology, Chung-Ang University, Anseong, Republic of Korea.

Food safety and Distribution Research Group, Korea Food Research Institute, Wanju, Republic of Korea.

出版信息

Front Plant Sci. 2023 Jan 5;13:1084997. doi: 10.3389/fpls.2022.1084997. eCollection 2022.

Abstract

Ethylene (ET) is a gaseous phytohormone with a crucial role in the ripening of many fruits, including kiwifruit ( spp.). Meanwhile, treatment with 1-methylcyclopropene (1-MCP), an artificial ET inhibitor delays the ripening of kiwifruit. The objective of this study was to determine the effect of ET and 1-MCP application during time-course storage of kiwifruit. In addition, we aimed to elucidate the molecular details underlying ET-mediated ripening process in kiwifruit. For this purpose, we conducted a time-course transcriptomic analysis to determine target genes of the ET-mediated maturation process in kiwifruit during storage. Thousands of genes were identified to be dynamically changed during storage and clustered into 20 groups based on the similarity of their expression patterns. Gene ontology analysis using the list of differentially expressed genes (DEGs) in 1-MCP-treated kiwifruit revealed that the identified DEGs were significantly enriched in the processes of photosynthesis metabolism and cell wall composition throughout the ripening process. Meanwhile, ET treatment rapidly triggered secondary metabolisms related to the ripening process, phenylpropanoid (e.g. lignin) metabolism, and the biosynthesis of amino acids (e.g. Phe, Cys) in kiwifruit. It was demonstrated that ET biosynthesis and signaling genes were oppositely affected by ET and 1-MCP treatment during ripening. Furthermore, we identified a ET transcription factor, (Acc32482) which is oppositely responsive by ET and 1-MCP treatment during early ripening, potentially one of key signaling factor of ET- or 1-MCP-mediated physiological changes. Therefore, this transcriptomic study unveiled the molecular targets of ET and its antagonist, 1-MCP, in kiwifruit during ripening. Our results provide a useful foundation for understanding the molecular details underlying the ripening process in kiwifruit.

摘要

乙烯(ET)是一种气态植物激素,在包括猕猴桃( 属)在内的许多水果成熟过程中起着关键作用。同时,用人工乙烯抑制剂1-甲基环丙烯(1-MCP)处理可延缓猕猴桃的成熟。本研究的目的是确定在猕猴桃贮藏过程中施用乙烯和1-MCP的效果。此外,我们旨在阐明猕猴桃中乙烯介导的成熟过程的分子细节。为此,我们进行了时间进程转录组分析,以确定贮藏期间猕猴桃中乙烯介导的成熟过程的靶基因。数千个基因在贮藏期间被鉴定为动态变化,并根据其表达模式的相似性聚类为20组。使用1-MCP处理的猕猴桃中差异表达基因(DEG)列表进行的基因本体分析表明,在整个成熟过程中,鉴定出的DEG在光合作用代谢和细胞壁组成过程中显著富集。同时,乙烯处理迅速触发了与猕猴桃成熟过程、苯丙烷类(如木质素)代谢以及氨基酸(如苯丙氨酸、半胱氨酸)生物合成相关的次生代谢。结果表明,在成熟过程中,乙烯生物合成和信号基因受到乙烯和1-MCP处理的相反影响。此外,我们鉴定出一个乙烯转录因子, (Acc32482),在早熟期间它对乙烯和1-MCP处理有相反的反应,可能是乙烯或1-MCP介导的生理变化的关键信号因子之一。因此,这项转录组研究揭示了成熟期间猕猴桃中乙烯及其拮抗剂1-MCP的分子靶点。我们的结果为理解猕猴桃成熟过程的分子细节提供了有用的基础。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a046/9849763/b84734866620/fpls-13-1084997-g001.jpg

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