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A Comparative Study of Pseudomonas andropogonis, P. stizolobii, and P. alboprecipitans

1971; Phytopathological Society of Japan; Volume: 37; Issue: 4 Linguagem: Inglês

10.3186/jjphytopath.37.233

1882-0484

Masao GOTO, M. P. Starr,

Plant Pathogens and Fungal Diseases

Four isolates of Pseudomonas andropogonis, three of P. stizolobii, and five of P. alboprecipitans were studied comparatively. All the isolates of P. andropogonis and P. stizolobii are practically identical in cultural, physiological, and biochemical properties (except for one isolate of P. andropogonis which is different in respect to Kovacs' oxidase reaction). All isolates are pathogenic on the leaves of sorghum (producing typical red stripes) and bean (forming small brown spots). All cultures of P. andropogonis and one isolate of P. stizolobii could infect white clover, developing black spots on the leaves; the remaining strains are avirulent for this plant. Two isolates of P. stizolobii did not infect corn or clover. From these results, it is concluded that the two pathogens fall into a single species, and constitute pathotypes specialized with respect to host range. Thus, Pseudomonas andropogonis is recommended as the scientific name of the bacterium under consideration, with P. stizolobii as a later synonym.The isolates of P. alboprecipitans obtained in Japan from corn and teosinte are different from the above mentioned bacteria in such bacteriological properties as nitrate reduction, starch hydrolysis, oxidase reaction, hydrogen sulfide production, etc. They are also different in symptoms and virulence on corn and sorghum. Taking all these factors into account, we presently recommend retention of P. alboprecipitans as a species separate from P. andropogonis; perhaps further study of the nonfluorescent phytopathogenic pseudomonads would eventually provide a different taxonomic conclusion.