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Plant Physiology 48:69-72 (1971)
© 1971 American Society of Plant Biologists

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Articles

Detrimental Effect of Rust Infection on the Water Relations of Bean

J. M. Duniwaya,1

R. D. Durbinb

a Research School of Biological Sciences, Australian National University, Box 475, Canberra, A.C.T. 2601, Australia, b Pioneering Research Laboratory, Plant Science Research Division, Agricultural Research Service, United States Department of Agriculture, Department of Plant Pathology, University of Wisconsin, Madison, Wisconsin 53706

Bean plants (Phaseolus vulgaris L.) infected with the rust Uromyces phaseoli became unusually susceptible to drought as sporulation occurred. Under the conditions used (1,300 ft-c, 27 C, and 55% relative humidity) such plants wilted at soil water potentials greater than –1 bar, whereas healthy plants did not wilt until the soil water potential fell below –3.4 bars. Determinations of leaf water and osmotic potentials showed that an alteration in leaf osmotic potential was not responsible for the wilting of diseased plants. When diffusive resistance was measured as a function of decreasing leaf water content, the resistance of healthy leaves increased to 50 sec cm–1 by the time relative water content decreased to 70%, whereas the resistance of diseased leaves remained less than 8 sec cm–1 down to 50% relative water content. Apparently, water vapor loss through cuticle damaged by the sporulation process, together with the reduction in root to shoot ratio which occurs in diseased plants, upset the water economy of the diseased plant under mild drought conditions.

1 National Science Foundation Postdoctoral Fellow. Present address: Department of Plant Pathology, University of California, Davis, Calif. 95616.






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Copyright © 1971 by the American Society of Plant Biologists