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Published in Crop Sci 13:264-267 (1973)
© 1973 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Resistance to Water Flow in Vigna sinensis L. (Endl.) at High Rates of Transpiration1

James L. Hailey, Edward A. Hiler, Wayne R. Jordan and C. H. M. van Bavel2

Recent studies support conflicting views concerning the validity of using an Ohm's Law analogy to describe liquid water flow through plants during transpiration. The results of these studies are compared with a common base; however, complete interpretation is difficult because most of the data are in a range of transpiration rates less than could be expected in a normal field environment.

Results of experiments with southern peas [Vigna sinensis L. (Endl.)] are presented in which high rates of transpiration were attained. Plants were studied in both the vegetative and the reproductive stages. In all experiments a linear relation between leaf water potential and transpiration rate was evident. This implies that the plant resistance to flow was constant, and hence, that an Ohm's Law analogy is valid for the transpiration rate range studied. Effects of plant age on the resistance to flow are discussed.

Key Words: Transpiration rate • Leaf water potential • Ohm's Law analogy • Plant resistance • Liquid water flow • Environmental simulator

1 A contribution of the Texas Agricultural Experiment Station. Research supported by the University NUPLEX program.

2 Former Research Assistant (Present address: Soil Conservation Service, Brownwood. Texas) and Associate Professor, Department of Agricultural Engineering; Assistant Professor, Department of Plant Sciences; and Professor, Department of Soil and Crop Sciences, respectively.

Received for publication August 18, 1972.




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