BTH Treatment Delays the Senescence of Postharvest Pitaya Fruit in Relation to Enhancing Antioxidant System and Phenylpropanoid Pathway.
BTH Treatment Delays the Senescence of Postharvest Pitaya Fruit in Relation to Enhancing Antioxidant System and Phenylpropanoid Pathway.
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BTH治疗延迟了pitaya果实的衰老，这与增强抗氧化剂系统和苯基丙烷途径有关。
DOI：
10.3390/foods10040846
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发表时间：
2021-04-13
期刊：
影响因子：
--
通讯作者：
Duan X
中科院分区：
文献类型：
--
作者：
Ding X;Zhu X;Zheng W;Li F;Xiao S;Duan X
植物抗病诱导剂苯并（1，2，3）-噻二唑-7-硫代羧酸S-甲酯（BTH）能提高采收果实的抗病性。尽管如此，BTH是否在调节果实衰老中起作用仍然是未知的。外源BTH处理能有效延缓采后火龙果果实的衰老，降低膜脂过氧化水平。此外，BTH处理的果实表现出较低的过氧化氢（H2 O2）含量，较高的还原型抗坏血酸（阿萨）和还原型谷胱甘肽（GSH）含量以及较高的还原型谷胱甘肽/氧化型谷胱甘肽比值（GSH/GSSG）和抗坏血酸（阿萨/DHA），以及更高活性的ROS清除酶，包括超氧化物歧化酶（SOD）、过氧化氢酶（CAT）、抗坏血酸过氧化物酶（APX），过氧化物酶（POD）和谷胱甘肽还原酶（GR）的活性。此外，BTH处理还提高了苯丙烷途径相关酶（肉桂酸-4-羟化酶（C4 H）、苯丙氨酸解氨酶（PAL）和4-香豆酸/辅酶A连接酶（4CL））的活性以及酚类、类黄酮和木质素的含量。此外，BTH处理上调HuSOD 1/3/4、HuCAT 2、HuAPX 1/2和HuPOD 1/2/4基因的表达。这些结果表明，BTH的施用延缓了采后火龙果果实的衰老，这与其增强了抗氧化系统和苯丙烷途径有关。
The plant resistance elicitor Benzo (1,2,3)-thiadiazole-7-carbothioic acid S-methyl ester (BTH) can enhance disease resistance of harvested fruit. Nonetheless, it is still unknown whether BTH plays a role in regulating fruit senescence. In this study, exogenous BTH treatment efficiently delayed the senescence of postharvest pitaya fruit with lower lipid peroxidation level. Furthermore, BTH-treated fruit exhibited lower hydrogen peroxide (H2O2) content, higher contents of reduced ascorbic acid (AsA) and reduced glutathione (GSH) levels and higher ratios of reduced to oxidized glutathione (GSH/GSSG) and ascorbic acid (AsA/DHA), as well as higher activities of ROS scavenging enzymes, including superoxide dismutase (SOD), catalase (CAT), ascorbate peroxidase (APX), peroxidase (POD) and glutathione reductase (GR) in comparison with control fruit. Moreover, BTH treatment enhanced the activities of phenylpropanoid pathway-related enzymes, including cinnamate-4-hydroxylase (C4H), phenylalanine ammonia-lyase (PAL) and 4-coumarate/coenzyme A ligase (4CL) and the levels of phenolics, flavonoids and lignin. In addition, BTH treatment upregulated the expression of HuSOD1/3/4, HuCAT2, HuAPX1/2 and HuPOD1/2/4 genes. These results suggested that application of BTH delayed the senescence of harvested pitaya fruit in relation to enhanced antioxidant system and phenylpropanoid pathway.
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