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Single gene enables plant pathogenic Pectobacterium to overcome host‐specific chemical defence

机译:单一基因使植物病原菌能够克服宿主特异性化学防御

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摘要

Plants of the Brassicales order, including and many common vegetables, produce toxic isothiocyanates to defend themselves against pathogens. Despite this defence, plant pathogenic microorganisms like cause large yield losses in fields and during storage of crops. The bacterial gene was previously found to encode isothiocyanate hydrolase that degrades isothiocyanates in vitro. Here we demonstrate in planta that is a virulence factor that can overcome the chemical defence system of Brassicales plants. Analysis of the distribution of genes in suggests that from three different phylogenetic origins are present within this genus. Deletion of genes representing two of the most common classes from and resulted in significantly reduced virulence on and . Furthermore, expressing from a plasmid in a potato‐specific strain that does not naturally harbour this gene significantly increased the ability of the strain to macerate . These findings suggest that a single gene may have a significant role in defining the host range of a plant pathogen.
机译:十字花科植物包括许多常见的蔬菜,会产生有毒的异硫氰酸盐,以防御病原体。尽管有这种防御,但植物病原微生物仍会在田间和农作物存储期间造成大量产量损失。先前发现该细菌基因编码在体外降解异硫氰酸酯的异硫氰酸酯水解酶。在这里,我们在植物中证明了一种可以克服小s类植物化学防御系统的毒力因子。对基因分布的分析表明,该属中存在三个不同的系统发生起源。删除代表两种最常见类的基因,并大大降低了和上的毒力。此外,在不具有天然基因的马铃薯特异性菌株中从质粒表达可以显着提高该菌株浸软的能力。这些发现表明,单个基因可能在定义植物病原体的宿主范围中起重要作用。

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