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Concentration- and time-dependent effects of isothiocyanates produced from Brassicaceae shoot tissues on the pea root rot pathogen Aphanomyces euteiches

机译:十字花科植物芽组织中产生的异硫氰酸盐对豌豆根腐病原菌Aphanomyces euteiches的浓度和时间依赖性

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摘要

Isothiocyanates (ITCs) hydrolyzed from glocosinolates (GSLs) in Brassicaceae tissue are toxic to soil organisms. In this study, the effect of aliphatic and aromatic ITCs from hydrated dy Brassicaceae shoot tissues on the mycelium and oospores of the pea root rot pathogen Aphanomyces euteiches was investigated. The profile and concentrations of GSLs in two test Brassicaceae species, Sinapis alba and Brassica juncea, and the ITCs from the dominant hydrolyzed parent GSLs were monitored. The concentrations of dominant ITCs and pathogen exposure time were evaluated in in vitro experiments. The greatest effect on the pathogen was observed from aliphatic ITCs hydrolyzed from B. juncea tissue, and the effect depended on the ITS concentration and exopsure time. ITCs were more effectively hydrolyzed from B. juncea GSLs than from S. alba GSLs; i.e., the ITC/GSL ratio was higher in B. juncea than in S. albatissue, giving a different release pattern. The release of phenylethyl isothiocyanate, which was common to both species, followed a pattern similar to that of the dominant ITC in each crop speices. This suggests that trait other than GSL content, e.g., plant cell structure, may affect the release of ITCs ans should therefore influence the choice of speices used for biofumigation purposes.
机译:从十字花科植物中的芥子油酸酯(GSL)水解而得的异硫氰酸酯(ITC)对土壤生物有毒。在这项研究中,研究了水合dys十字花科芽组织中的脂肪族和芳香族ITC对豌豆根腐病病菌Aphanomyces euteiches的菌丝体和卵囊的影响。监测了两个测试的十字花科植物芥菜和芥菜油菜的GSLs的分布和浓度,以及主要水解母本GSLs的ITC。在体外实验中评估了主要ITC的浓度和病原体暴露时间。从Juncea组织中水解的脂肪族ITC观察到对病原体的影响最大,其影响取决于ITS浓度和暴露时间。 ITCs从芥菜B型GSL中水解得比S. alba GSL中的水解更有效。即,芥菜形杆菌中的ITC / GSL比高于信天翁中的ITC / GSL比,释放方式有所不同。两种物种共有的异硫氰酸苯乙基酯的释放遵循与每种作物中主要ITC相似的释放模式。这表明除GSL含量外的其他特性(例如植物细胞结构)可能会影响ITC的释放,因此应影响用于生物熏蒸目的香料的选择。

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