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Effect of cyanogenic Pseudomonas aeruginosa on tomato bacterial wilt caused by Ralstonia solanacearum



Effect of cyanogenic Pseudomonas aeruginosa on tomato bacterial wilt caused by Ralstonia solanacearum



Phytopathology 93(6 Supplement): S53, June



Some strains of plant-associated Pseudomonas aeruginosa (Pa) were strong cyanogenic. The strong cyanogenic P. a. inhibited the growth of Ralstonia solanacearum (Rs) in a paired-plate system. The effect of cyanogenic P. a. on tomato bacterial wilt caused by R. s. was evaluated in a peat moss-containing pot system. The disease severities of tomato plants treated with a R. s. suspension added with strong cyanogenic P. a., were significantly greater than that of plants treated with a suspension containing only R. s. HCN bio-synthetic genes hcnABC of strong cyanogenic P. a. WFP11r had been cloned and transformed into non-cyanogenic P. putida YLFP44 by electroporation. The transformant Y44H1 which produced high quantities of HCN, also inhibited the R. s. in the paired-plate system. The disease severities of tomato plants treated with a R. s. suspension added with Y44H1, were also significantly greater than that of plants treated with a R. s. suspension added with non-cyanogenic Y44C1, a transformant with vector only. The results demonstrated that HCN play an important role for strong cyanogenic P. a. to increase the disease severity of tomato bacterial wilt caused by R. s.

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