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Exogenous melatonin improves the chilling tolerance and preharvest fruit shelf life in eggplant by affecting ROS-and senescence-related processes

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Horticultural Plant Journal 2023年第3期9卷 523-540页

作者： Lijun Song Zhuo Tan Weiwei Zhang Qiang Li Zhaoxiang Jiang Shuxing Shen Shuangxia Luo Xueping Chen State Key Laboratory of North China Crop Improvement and regulation Key Laboratory of Vegetable Germplasm Innovation and Utilization of HebeiCollaborative Innovation Center of Vegetable Industry in HebeiCollege of HorticultureHebei Agricultural UniversityBaodingHebei 071000China College of Life Sciences Hebei Agricultural UniversityBaodingHebei 071000China

Low temperature is the most common abiotic stress factors during the eggplant cultivation in solar *** plays important roles in plant resistance to low ***,the role of melatonin in regulating chilling tolerance and extending the preharvest shelf life of eggplant fruits is still *** this study,we investigated the effects of exogenous melatonin on eggplant plants and fruits in response to low *** simulated low-temperature conditions,exogenous melatonin significantly relieved the chilling symptoms of seedlings by reducing reactive oxygen species (ROS) and malondialdehyde (MDA) levels and relative leakage *** reductions were caused by higher superoxide dismutase (SOD) and catalase (CAT) activities and increased endogenous polyamine and melatonin levels compared with those in untreated ***,the expression levels of SOD,CAT1/2,and polyamine synthesis genes (ADC and ODC) were also increased by 100μmol·L~(-1)melatonin,as well as those of genes involved in melatonin synthesis (TDC,T5H,SNAT,ASMT,and COMT) and cold regulation (COR1,CBFa/b,and ZAT2/6/12).To further investigate the effects of melatonin on eggplant leaves and fruits under natural low temperature conditions,100μmol·L~(-1)melatonin was sprayed on the functional leaves at three days before commodity *** significantly alleviated chilling injury in the leaves and pericarp and extended the preharvest shelf life of the fruit by increasing the expression of COR1,CBF,ZAT2/6/12,and API5 and decreasing the expression of senescence-related genes (NCED1/2 and SAG12).Therefore,100μmol·L~(-1)melatonin improved chilling tolerance and fruit shelf life by upregulating ZAT2/6/12 to affect ROS-and senescence-related processes,which provides a reference for alleviating cold stress and extending the preharvest fruit shelf life in eggplant.

关键词： Eggplant Melatonin Chilling tolerance cold regulation Reactive oxygen species Preharvest fruit shelf life

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