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Physiology and Biochemistry

Effects of Watersoaking on Response to Xanthomonas vesicatoria in Pepper Leaves. A. A. Cook, Professor of Plant Pathology, Institute of Food and Agricultural Sciences, University of Florida, Gainesville, FL 32611; R. E. Stall, Professor of Plant Pathology, Institute of Food and Agricultural Sciences, University of Florida, Gainesville, FL 32611. Phytopathology 67:1101-1103. Accepted for publication 25 February 1977. Copyright 1977 The American Phytopathological Society, 3340 Pilot Knob Road, St. Paul, MN 55121. All rights reserved.. DOI: 10.1094/Phyto-67-1101.

Detached pepper leaves watersoaked after infiltration with Xanthomonas vesicatoria (XV) did not develop a hypersensitive response (HR). Bacterial concentration in the inoculum and multiplication in vivo during incubation resulted in bacterial populations in excess of the minimal concentration required to induce HR, but only a small increase in electrolyte leakage was detected after 24-36 hr of incubation. Typical development of HR began 2-3 hr after watersoaking was permitted to dissipate from leaves kept watersoaked for various periods ranging from 0-6 hr after inoculation. Patterns of bacterial multiplication and electrolyte leakage in detached leaves kept watersoaked for 72 hr after infiltration inoculation with either of two pathotypes of XV were similar to results from susceptible leaves left in situ after inoculation.

Additional keywords: Capsicum annuum, bacterial leaf spot of pepper, bacterial multiplication, electrolyte leakage.