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Article

Transcriptome Analysis Reveals the Mechanism by Which Exogenous Melatonin Treatment Delays Leaf Senescence of Postharvest Chinese Kale (Brassica oleracea var. alboglabra)

by
Hongmei Di
†,
Chenlu Zhang
†,
Aolian Zhou
,
Huanhuan Huang
,
Yi Tang
,
Huanxiu Li
,
Zhi Huang
,
Fen Zhang
* and
Bo Sun
*
College of Horticulture, Sichuan Agricultural University, Chengdu 611130, China
*
Authors to whom correspondence should be addressed.
†
These authors contributed equally to this work.
Int. J. Mol. Sci. 2024, 25(4), 2250; https://doi.org/10.3390/ijms25042250
Submission received: 17 January 2024 / Revised: 6 February 2024 / Accepted: 9 February 2024 / Published: 13 February 2024
(This article belongs to the Special Issue Horticultural Crop Improvement: A New Era for Plant Molecular Research: 3rd Edition)
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Abstract

Melatonin, a pleiotropic small molecule, is employed in horticultural crops to delay senescence and preserve postharvest quality. In this study, 100 µM melatonin treatment delayed a decline in the color difference index h* and a*, maintaining the content of chlorophyll and carotenoids, thereby delaying the yellowing and senescence of Chinese kale. Transcriptome analysis unequivocally validates melatonin’s efficacy in delaying leaf senescence in postharvest Chinese kale stored at 20 °C. Following a three-day storage period, the melatonin treatment group exhibited 1637 differentially expressed genes (DEGs) compared to the control group. DEG analysis elucidated that melatonin-induced antisenescence primarily governs phenylpropanoid biosynthesis, lipid metabolism, plant signal transduction, and calcium signal transduction. Melatonin treatment up-regulated core enzyme genes associated with general phenylpropanoid biosynthesis, flavonoid biosynthesis, and the α-linolenic acid biosynthesis pathway. It influenced the redirection of lignin metabolic flux, suppressed jasmonic acid and abscisic acid signal transduction, and concurrently stimulated auxin signal transduction. Additionally, melatonin treatment down-regulated RBOH expression and up-regulated genes encoding CaM, thereby influencing calcium signal transduction. This study underscores melatonin as a promising approach for delaying leaf senescence and provides insights into the mechanism of melatonin-mediated antisenescence in postharvest Chinese kale.
Keywords: melatonin; Chinese kale; phenylpropanoids; α-linolenic acid; plant hormone; calcium melatonin; Chinese kale; phenylpropanoids; α-linolenic acid; plant hormone; calcium

Share and Cite

MDPI and ACS Style

Di, H.; Zhang, C.; Zhou, A.; Huang, H.; Tang, Y.; Li, H.; Huang, Z.; Zhang, F.; Sun, B. Transcriptome Analysis Reveals the Mechanism by Which Exogenous Melatonin Treatment Delays Leaf Senescence of Postharvest Chinese Kale (Brassica oleracea var. alboglabra). Int. J. Mol. Sci. 2024, 25, 2250. https://doi.org/10.3390/ijms25042250

AMA Style

Di H, Zhang C, Zhou A, Huang H, Tang Y, Li H, Huang Z, Zhang F, Sun B. Transcriptome Analysis Reveals the Mechanism by Which Exogenous Melatonin Treatment Delays Leaf Senescence of Postharvest Chinese Kale (Brassica oleracea var. alboglabra). International Journal of Molecular Sciences. 2024; 25(4):2250. https://doi.org/10.3390/ijms25042250

Chicago/Turabian Style

Di, Hongmei, Chenlu Zhang, Aolian Zhou, Huanhuan Huang, Yi Tang, Huanxiu Li, Zhi Huang, Fen Zhang, and Bo Sun. 2024. "Transcriptome Analysis Reveals the Mechanism by Which Exogenous Melatonin Treatment Delays Leaf Senescence of Postharvest Chinese Kale (Brassica oleracea var. alboglabra)" International Journal of Molecular Sciences 25, no. 4: 2250. https://doi.org/10.3390/ijms25042250

APA Style

Di, H., Zhang, C., Zhou, A., Huang, H., Tang, Y., Li, H., Huang, Z., Zhang, F., & Sun, B. (2024). Transcriptome Analysis Reveals the Mechanism by Which Exogenous Melatonin Treatment Delays Leaf Senescence of Postharvest Chinese Kale (Brassica oleracea var. alboglabra). International Journal of Molecular Sciences, 25(4), 2250. https://doi.org/10.3390/ijms25042250

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