Current Ideas on the Genetics and Regulation of the Synthesis of Phaseolotoxin in Pseudomonas Syringae PV. Phaseolicola

摘要: The bacterium Pseudomonas syringae pv. phaseolicola is the causal agent of “halo blight” disease beans (Phaseolus vulgaris L.). This shares wide evolutionary relatedness with savastonoi, and it was proposed that its taxonomic status be changed to P. savastanoi phaseolicola; however, this proposal has been rejected organism maintained within group66. attacks both foliage pods, a major problem in temperate areas world. Leaf symptoms appear several days after infection as small water-soaked spots on lower surface. At 7-10 infection, lesions greasy points infections. Pods can also infected brown or red spots.Seeds may become transmitted through seed. temperatures between 18°C 23°C high humidity, zone yellow-green tissue develop around initial site 3–8 days, giving rise what known chlorotic halo. In cases severe chlorosis systemic. fact, halo blight considered low-temperature epidemic potential greatest at ranging 22°C.