College of Food Science and Engineering, Hainan University, Haikou 570228, PR China; Key Laboratory of Food Nutrition and Functional Food of Hainan Province, Haikou 570228, PR China.
College of Food Science and Engineering, Hainan University, Haikou 570228, PR China; College of Food Science & Nutritional Engineering, China Agricultural University, Beijing 100083, PR China.
Food Chem. 2021 Jun 15;347:129009. doi: 10.1016/j.foodchem.2021.129009. Epub 2021 Jan 7.
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, Ca-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. .
荔枝是一种美味且具有经济价值的水果。然而，由于荔枝霜疫霉（Peronophythora litchii）的侵染，采后荔枝极易发生荔枝霜疫霉病，导致品质下降。本研究旨在探讨褪黑素对‘妃子笑’荔枝采后抗荔枝霜疫霉病的影响。结果表明，褪黑素可抑制荔枝接种荔枝霜疫霉后的病斑扩展。褪黑素通过增强苯丙氨酸解氨酶、肉桂酸-4-羟化酶和 4-羟基肉桂酰辅酶 A 连接酶的活性，促进酚类和类黄酮的积累。与对照果实相比，处理果实中的烟酰胺腺嘌呤二核苷酸磷酸含量以及葡萄糖-6-磷酸脱氢酶和 6-磷酸葡萄糖酸脱氢酶的活性更高。处理果实中的琥珀酸脱氢酶和细胞色素 C 氧化酶的活性也更高，能量状态也更高。超微结构观察表明，处理果实中的线粒体损伤减轻。这些结果表明，褪黑素通过调节苯丙烷途径和戊糖磷酸途径以及能量代谢诱导荔枝产生抗性。
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