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Hypoxic stress inhibits aerobic wound-induced resistance and activates hypoxic resistance to bacterial soft rot |
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| Authors: | Michael E Vayda Lyudmil S Antonov Z Yang William O Butler George H Lacy |
| Institution: | 1. Department of Biochemistry, University of Maine, 04469-0131, Orono, ME 2. University Center for Environmental and Hazardous Materials Studies, Department of Biology, Virginia Polytechnic Institute and State University, 24061-0415, Blacksburg, VA 3. Laboratory for Molecular Biology of Plant Stress, Department of Plant Pathology, Physiology and Weed Science, Virginia Polytechnic Institute and State University, 24061-0330, Blacksburg, VA 5. SIBIA, Inc., P.O. Box 85200, 92138-9216, San Diego, CA |
| Abstract: | Resistance to bacterial soft rot in potato tubers maintained aerobically was induced by wounding tubers 4 to 24 h prior to inoculation withErwinia carotovora subsp.carotovora. This wound-induced resistance phenomenon was blocked by hypoxic stress. An hypoxia-induced resistance mechanism also was detected: tubers acclimated to a hypoxic environment were resistant to rot when inoculated with aerobically grownE. c. subsp.carotovora and incubated in atmospheres made hypoxic by argon or nitrogen. With increased pretreatment, hypoxia-induced resistance approached the levels of resistance observed in tubers inoculated with aerobic-adapted bacteria and incubated aerobically. Hypoxia-adaptedE. c. subsp.carotovora overcame hypoxia-induced resistance. |
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