Melatonin delays leaf senescence in pak choi (Brassica rapa subsp. chinensis) by regulating biosynthesis of the second messenger cGMP
文献类型： 外文期刊
作者： Liu, Xuesong 1 ; An, Ronghui 5 ; Li, Guofeng 1 ; Luo, Shufen 1 ; Hu, Huali 1 ; Li, Pengxia 1 ;
作者机构： 1.Jiangsu Acad Agr Sci, Inst Agr Facil & Equipment, Nanjing 210014, Jiangsu, Peoples R China
2.Jiangsu Univ, Sch Food & Biol Engn, Zhenjiang 212013, Jiangsu, Peoples R China
3.Jiangsu Key Lab Hort Crop Genet Improvement, Nanjing 210014, Jiangsu, Peoples R China
4.Minist Agr & Rural Affairs, Key Lab Cold Chain Logist Technol Agroprod, Nanjing 210014, Peoples R China
5.All China Federat Supply & Mkt Cooperat, Jinan Fruit Res Inst, Jinan 250220, Shandong, Peoples R China
关键词： Pak choi; Melatonin; cGMP; Chlorophyll degradation; Senescence
期刊名称：HORTICULTURAL PLANT JOURNAL （ 影响因子：5.7； 五年影响因子：5.4 ）
ISSN： 2095-9885
年卷期： 2024 年 10 卷 1 期
页码：
收录情况： SCI
摘要： 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.
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