Inhibition of downy blight and enhancement of resistance in litchi fruit by postharvest application of melatonin.
Inhibition of downy blight and enhancement of resistance in litchi fruit by postharvest application of melatonin.
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DOI：
10.1016/j.foodchem.2021.129009
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发表时间：
2021-01
期刊：
影响因子：
8.8
通讯作者：
Zhengke Zhang;Tian Wang;Gangshuai Liu;Meijiao Hu;Ze Yun;X. Duan;Kun Cai;Guoxiang Jiang
中科院分区：
文献类型：
--
作者：
Zhengke Zhang;Tian Wang;Gangshuai Liu;Meijiao Hu;Ze Yun;X. Duan;Kun Cai;Guoxiang Jiang
荔枝是具有重要经济价值的美味水果。然而，荔枝采收后对霜疫霉引起的荔枝霜霉病极为敏感，影响了荔枝的品质。本研究旨在研究褪黑激素对采后抗P.妃子笑荔枝结果表明，褪黑激素抑制了P.褪黑激素能提高荔枝叶片苯丙氨酸解氨酶、肉桂酸-4-羟化酶和4-羟基肉桂酸CoA连接酶的活性，促进酚类和类黄酮的积累。烟酰胺腺嘌呤二核苷酸磷酸含量、葡萄糖-6-磷酸脱氢酶和6-磷酸葡萄糖酸脱氢酶活性均高于对照。结果表明，处理后的果实沿着出现较高的能量状态，同时H+-ATPase、Ca 2 +-ATPase、琥珀酸脱氢酶和细胞色素氧化酶活性升高。超微结构观察表明，在处理的水果线粒体损伤减少。结果表明，褪黑激素通过调节苯丙素和戊糖磷酸途径以及能量代谢诱导荔枝抗性。
Litchis are tasty fruit with economic importance. However, the extreme susceptibility of harvested litchis to litchi downy blight caused byPeronophythora litchiileads to compromised quality. This study aimed to study the effects of melatonin on postharvest resistance toP. litchiiin ‘Feizixiao’ litchis. Results showed that melatonin restricted lesion expansion in litchis afterP. litchiinoculation.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 cytochromeCoxidase 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..