胡桃
苯丙氨酸解氨酶
生物
类黄酮
枯萎病
过氧化氢酶
类黄酮生物合成
超氧化物歧化酶
野油菜黄单胞菌
微生物学
查尔酮异构酶
植物
生物化学
转录组
过氧化物酶
查尔酮合酶
酶
基因
基因表达
抗氧化剂
作者
Hao Wu,Yubo Sun,Liang Ma,Siying Cheng,Deguo Lv,Jianjun Hao,Lirong Han
标识
DOI:10.1016/j.foodchem.2023.137551
摘要
Bacterial blight caused by Xanthomonas arboricola pv. juglandis is a major obstacle to walnut production. EPS66A, derived from Streptomyces sp. strain HL-66, has various beneficial properties, including broad-spectrum microbe inhibition and plant disease resistance induction. To understand the effects of Xaj and EPS66A on walnut, a comprehensive analysis of the metabolome and transcriptome was conducted. While EPS66A did not directly inhibit Xaj on agar media, applying it at 200 μg/mL, 24 h after Xaj inoculation on walnut leaves, significantly reduced bacterial blight in a greenhouse. Additionally, EPS66A increased phenolic and flavonoid concentrations and enhanced enzymatic activities associated with resistance, such as catalase, superoxide dismutase, peroxidase, and phenylalanine ammonia lyase. Differential expression of eleven metabolites and fourteen genes related to flavonoid biosynthesis pathway was observed. Consequently, EPS66A application induced systemic resistance in walnuts, effectively preventing Xaj infection. This study provides insights into the flavonoid biosynthesis mechanism underlying EPS66A-induced resistance in walnuts.
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