Dialogues of root-colonizing biocontrol pseudomonads
Dialogues of root-colonizing biocontrol pseudomonads
复制标题
DOI：
10.1007/s10658-007-9157-1
复制
发表时间：
2007-11-01
影响因子：
1.8
通讯作者：
Haas, Dieter
中科院分区：
文献类型：
--
作者：
Dubuis, Christophe;Keel, Christoph;Haas, Dieter
在能够抑制由真菌病原体引起的根部疾病的生物防治剂中，定殖于根部的荧光假单胞菌受到特别关注，因为这些细菌的许多菌株在宿主植物中触发系统抗性并产生抗真菌化合物和胞外酶。一般而言，这些植物有益性状的表达受自诱导机制调节，并且当假单胞菌形成小菌落时可能发生在根上。本文详细综述了三大类抗生素化合物（2，4-二乙酰基间苯三酚，pyoluerexin和各种吩嗪化合物）都是在转录和转录后水平上作用的细胞群体密度依赖性自诱导控制下产生的。这种调节可以通过假单胞菌本身、其他微生物或根分泌物发出的各种化学信号来加强或减弱。通过Gac/Rsm信号转导途径刺激生防菌株荧光假单胞菌CHA 0中生防因子表达的信号是由许多不同的植物相关细菌合成的，这将在未来进行更详细的研究。
Among biocontrol agents that are able to suppress root diseases caused by fungal pathogens, root-colonizing fluorescent pseudomonads have received particular attention because many strains of these bacteria trigger systemic resistance in host plants and produce antifungal compounds and exoenzymes. In general, the expression of these plant-beneficial traits is regulated by autoinduction mechanisms and may occur on roots when the pseudomonads form microcolonies. Three major classes of antibiotic compounds reviewed here in detail (2,4-diacetylphloroglucinol, pyoluteorin and various phenazine compounds) are all produced under cell population density-dependent autoinduction control acting at transcriptional and post-transcriptional levels. This regulation can either be reinforced or attenuated by a variety of chemical signals emanating from the pseudomonads themselves, other microorganisms or root exudates. Signals stimulating biocontrol factor expression via the Gac/Rsm signal transduction pathway in the biocontrol strain Pseudomonas fluorescens CHA0 are synthesized by many different plant-associated bacteria, warranting a more detailed investigation in the future.