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首页> 美国卫生研究院文献>Journal of Bacteriology >Plant and environmental sensory signals control the expression of hrp genes in Pseudomonas syringae pv. phaseolicola.
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Plant and environmental sensory signals control the expression of hrp genes in Pseudomonas syringae pv. phaseolicola.

机译：植物和环境的感觉信号控制着丁香假单胞菌PV中hrp基因的表达。菜豆。

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摘要

The hrp genes of Pseudomonas syringae pv. phaseolicola control the development of primary disease symptoms in bean plants and the elicitation of the hypersensitive response in resistant plants. We examined the expression of the seven operons located in the 22-kb hrp cluster (L. G. Rahme, M. N. Mindrinos, and N. J. Panopoulos, J. Bacteriol. 173:575-586, 1991) in planta and in vitro under different physiological and nutritional conditions by using chromosomally located hrp::inaZ reporter fusions. We show that (i) a plant signal(s) is specifically required for the induction of the seven hrp operons, during both compatible and incompatible interactions; (ii) hrpL and hrpRS are regulated by different mechanisms in planta and in vitro; and (iii) expression of individual hrp loci is differentially affected by pH, osmotic strength, and type of carbon source: hrpAB, hrpC, and hrpD were downregulated similarly by osmolarity, pH, and certain carbon sources; hrpE expression was affected strongly by pH and carbon substrate and slightly by osmolarity; and hrpF was not substantially affected by any of these factors. These findings suggest complex signaling mechanisms taking place during plant-pathogen interactions.
机译：丁香假单胞菌PV的hrp基因。菜豆控制豆类植物中原发病症状的发展以及抗性植物中超敏反应的诱发。我们检查了位于22kb hrp簇中的七个操纵子的表达（LG Rahme，MN Mindrinos和NJ Panopoulos，J。Bacteriol。173：575-586，1991）在不同生理和营养条件下在植物体内和体外的表达通过使用位于染色体上的hrp :: inaZ报告基因融合体。我们表明（i）在兼容和不兼容的相互作用中，诱导七个hrp操纵子特别需要一种植物信号； （ii）hrpL和hrpRS在植物体内和体外受不同机制的调控； （iii）单个hrp基因座的表达受pH，渗透强度和碳源类型的影响不同：渗透压，pH和某些碳源对hrpAB，hrpC和hrpD的表达也有类似的下调； pH和碳底物对hrpE表达的影响很大，而渗透压对hrpE表达的影响很小。而hrpF基本上不受任何这些因素的影响。这些发现表明在植物-病原体相互作用期间发生复杂的信号传导机制。

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