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Appl. Environ. Microbiol., Jan 1995, 393-396, Vol 61, No. 1
Copyright © 1995, American Society for Microbiology

Unusual Growth Phase and Oxygen Tension Regulation of Oxidative Stress Protection Enzymes, Catalase and Superoxide Dismutase, in the Phytopathogen Xanthomonas oryzae pv. oryzae

S Chamnongpol, S Mongkolsuk, P Vattanaviboon and M Fuangthong
Department of Biotechnology, Faculty of Science, Mahidol University, Bangkok 10400, and Laboratory of Biotechnology, Chulabhorn Research Institute, Lak Si, Bangkok 10210, Thailand

The enzymes catalase and superoxide dismutase play major roles in protecting phytopathogenic bacteria from oxidative stress. In Xanthomonas species, these enzymes are regulated by both growth phase and oxygen tension. The highest enzyme levels were detected within 1 h of growth. Continued growth resulted in a decline of both enzyme activities. High oxygen tension was an inducing signal for both enzyme activities. An 80,000-Da monofunctional catalase and a manganese superoxide dismutase were the major forms of the enzymes detected at different stages of growth. The unusual regulatory patterns are common among several Xanthomonas strains tested and may be advantageous to Xanthomonas species during the initial stage of plant-microorganism interactions.

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