一种具有类似动物病原体 III 型分泌功能的海洋细菌会引起陆生植物的非宿主超敏反应

Boyoung Lee, Jeong-Im Lee, Soon-Kyeong Kwon, C. Ryu, Jihyun F. Kim
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引用次数: 0

摘要

涉及程序性细胞死亡的主动植物免疫反应称为超敏反应(hypersensitive response, HR),是由微生物效应物通过III型分泌系统(T3SS)引起的。海洋细菌Hahella chejuensis含有两种与动物病原体相似的t3ss,但它能够在陆地植物Nicotiana benthamiana中引起hr样细胞死亡。细胞死亡与车菊T3SS-1基因的转录模式相似,由植物抗性的一般调节因子SGT1介导,并被抑制HR的植物病原体iii型分泌效应物AvrPto1抑制。因此,海洋细菌的iii型分泌效应物能够在其从未遇到过的陆地植物中诱导非宿主HR。这表明植物可能已经进化到能够应对外来病原体效应物带来的潜在威胁。我们的工作记录了一个特殊的非寄主HR案例,为研究植物非寄主抗性提供了一个扩展的视角。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A Marine Bacterium with Animal-Pathogen-Like Type III Secretion Elicits the Nonhost Hypersensitive Response in a Land Plant
Active plant immune response involving programmed cell death called the hypersensitive response (HR) is elicited by microbial effectors delivered through the type III secretion system (T3SS). The marine bacterium Hahella chejuensis contains two T3SSs that are similar to those of animal pathogens, but it was able to elicit HR-like cell death in the land plant Nicotiana benthamiana. The cell death was comparable with the transcriptional patterns of H. chejuensis T3SS-1 genes, was mediated by SGT1, a general regulator of plant resistance, and was suppressed by AvrPto1, a type III-secreted effector of a plant pathogen that inhibits HR. Thus, type III-secreted effectors of a marine bacterium are capable of inducing the nonhost HR in a land plant it has never encountered before. This suggests that plants may have evolved to cope with a potential threat posed by alien pathogen effectors. Our work documents an exceptional case of nonhost HR and provides an expanded perspective for studying plant nonhost resistance.
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