Low temperature transcriptionally modulates natural peel degreening in lemon (Citrus limon L.) fruit independently of endogenous ethylene

Peel degreening is an important aspect of fruit ripening in many citrus fruit, and earlier studies have shown that it can be advanced either by ethylene treatment or during low temperature storage. However, the important regulators and pathways involved in natural peel degreening remain largely unkn...

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Published inbioRxiv
Main Authors Mitalo, Oscar W, Otsuki, Takumi, Okada, Rui, Obitsu, Saeka, Masuda, Kanae, Hojo, Yuko, Matsuura, Takakazu, Mori, Izumi C, Abe, Daigo, Asiche, William O, Akagi, Takashi, Kubo, Yasutaka, Ushijima, Koichiro
Format Paper
LanguageEnglish
Published Cold Spring Harbor Cold Spring Harbor Laboratory Press 27.11.2019
Subjects
Chlorophyll
Citrus fruits
Citrus limon
Ethylene
Fruits
Gene expression
Low temperature
Photosystem
Signal transduction
Transcription factors
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Summary:Peel degreening is an important aspect of fruit ripening in many citrus fruit, and earlier studies have shown that it can be advanced either by ethylene treatment or during low temperature storage. However, the important regulators and pathways involved in natural peel degreening remain largely unknown. To understand how natural peel degreening is regulated in lemon (Citrus limon L.) fruit, flavedo transcriptome and physiochemical changes in response to either ethylene treatment or low temperature were studied. Ethylene treatment induced rapid peel degreening which was strongly inhibited by the ethylene antagonist, 1-methylcyclopropene (1-MCP). Compared with 25°C, moderately low temperatures (5°C, 10°C, 15°C and 20°C) also triggered peel degreening. Surprisingly, repeated 1-MCP treatments failed to inhibit the peel degreening induced by low temperature. Transcriptome analysis revealed that low temperature and ethylene independently regulated genes associated with chlorophyll degradation, carotenoid metabolism, photosystem proteins, phytohormone biosynthesis and signalling, and transcription factors. On-tree peel degreening occurred along with environmental temperature drops, and it coincided with the differential expression of low temperature-regulated genes. In contrast, genes that were uniquely regulated by ethylene showed no significant expression changes during on-tree peel degreening. Based on these findings, we hypothesize that low temperature plays a prominent role in regulating natural peel degreening independently of ethylene in citrus fruit.
DOI:10.1101/855775