首页|Melatonin delays leaf senescence in pak choi(Brassica rapa subsp.chinensis)by regulating biosynthesis of the second messenger cGMP

Melatonin delays leaf senescence in pak choi(Brassica rapa subsp.chinensis)by regulating biosynthesis of the second messenger cGMP

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Melatonin(MT)is a low molecular weight compound with multiple biological functions in plants.It is known to delay leaf senescence in various species.However,no data are available on the MT signaling pathway in postharvest vegetables.This study demonstrates that MT increases cGMP concentration and the expression of the cGMP synthesis gene BcGC1 in pak choi.The cGMP inhibitor LY83583 destroys effect of MT delaying the leaf senescence.LY83583 also prevents MT treatment from reducing the expression of chlorophyll metabolism-related genes(BcNYC1,BcNOL,BcPPH1/2,BcSGR1/2,and BcPAO)and senescence genes(BcSAG12 and BcSAG21).It also inhibits MT from reducing the activity of the key chlorophyll catabolism enzymes Mg-dechelatase,pheophytinase,and pheide a oxygenase.Thus,the ability of MT to maintain high levels of chlorophyll metabolites is also destroyed.The Arabidopsis cGMP synthetic gene mutant atgc1 was used to confirm that delayed leaf senescence caused by MT is mediated,at least in part,by the second messenger cGMP.

Pak choiMelatonincGMPChlorophyll degradationSenescence

Xuesong Liu、Ronghui An、Guofeng Li、Shufen Luo、Huali Hu、Pengxia Li

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Institute of Agricultural Facilities and Equipment,Jiangsu Academy of Agricultural Sciences,Nanjing,Jiangsu 210014,China

Jinan Fruit Research Institute,All China Federation of Supply and Marketing Cooperatives,Jinan,Shandong 250220,China

School of Food and Biological Engineering,Jiangsu University,Zhenjiang,Jiangsu 212013,China

Jiangsu Key Laboratory for Horticultural Crop Genetic Improvement,Nanjing,Jiangsu 210014,China

Key Laboratory of Cold Chain Logistics Technology for Agro-Products,Ministry of Agriculture and Rural Affairs,Nanjing,Jiangsu 210014,China

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National Natural Science Foundation of ChinaJiangsu Agriculture Science and Technology Innovation Fund

32001451CX201008

2024

10.1016/j.hpj.2023.03.009

园艺学报(英文版)

园艺学报(英文版)

CSTPCD
ISSN：
年,卷(期)：2024.10(1)
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