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Inhibition of downy blight and enhancement of resistance in litchi fruit by postharvest application of melatonin

文献类型： 外文期刊

作者： Zhang, Zhengke 1 ; Wang, Tian 1 ; Liu, Gangshuai 1 ; Hu, Meijiao 3 ; Yun, Ze 2 ; Duan, Xuewu 2 ; Cai, Kun 1 ; Jiang, Guox 1 ;

作者机构： 1.Hainan Univ, Coll Food Sci & Engn, Haikou 570228, Hainan, Peoples R China

2.Chinese Acad Sci, South China Bot Garden, Guangzhou 510650, Peoples R China

3.Chinese Acad Trop Agr Sci, Environm & Plant Protect Inst, Haikou 571101, Hainan, Peoples R China

4.China Agr Univ, Coll Food Sci & Nutr Engn, Beijing 100083, Peoples R China

5.Key Lab Food Nutr & Funct Food Hainan Prov, Haikou 570228, Hainan, Peoples R China

关键词： Postharvest disease; Peronophythora litchii; Induced resistance; Energy metabolism; Phenylpropanoid pathway

期刊名称：FOOD CHEMISTRY （ 影响因子：7.514； 五年影响因子：7.516 ）

ISSN： 0308-8146

年卷期： 2021 年 347 卷

页码：

收录情况： SCI

摘要： Litchis are tasty fruit with economic importance. However, the extreme susceptibility of harvested litchis to litchi downy blight caused by Peronophythora litchii leads to compromised quality. This study aimed to study the effects of melatonin on postharvest resistance to P. litchii in 'Feizixiao' litchis. Results showed that melatonin restricted lesion expansion in litchis after P. litchi inoculation. Melatonin enhanced the activities of phenylalanine ammonia-lyase, cinnamate-4-hydroxylase and 4-hydroxycinnamate CoA ligase while promoting the accumulations of phenolics and flavonoids. Nicotinamide adenine dinucleotide phosphate content and glucose-6 phosphate dehydrogenase and 6-phosphogluconic acid dehydrogenase activities were higher in treated fruit than control fruit. Higher energy status along with elevated H+-ATPase, Ca2+-ATPase, succinate dehydrogenase and cytochrome C oxidase activities were observed in treated fruit. Ultrastructural observation showed reduced damage in mitochondria in treated fruit. The results suggest that melatonin induced resistance in litchis by modulating the phenylpropanoid and pentose phosphate pathways as well as energy metabolism. .

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