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Published in Crop Sci 12:733-735 (1972)
© 1972 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Stomatal Resistance, Net Photosynthesis, and Transpiration in PMA-Treated Sorghum: A Field Study1

J. W. Sij, E. T. Kanemasu and I. D. Teare2

Diffusion porometry and a field-chamber system were employed to study the effects of single applications of 90 to 720 µM phenylmercuric acetate (PMA) on stomatal resistance, photosynthesis, and transpiration in fieldgrown sorghum [Sorghum bicolor (L.) Moench]. To maintain increased stomatal resistance up to 20 days it was necessary to apply at least 360 µM PMA. Preliminary data showed that in short-term studies of 3 to 4 days post-treatment, photosynthesis was reduced (at least temporarily) more than was transpiration by PMA concentrations that produced prolonged effects on stomata. Diffusion porometry and field chambers can be used to test other antitranspirants applied to field-grown crops.

Key Words: Water-use efficiency • Antitranspirant • Infrared gas analyzer

1 Contribution no. 1237, Agronomy Department, Kansas Agricultural Experiment Station, Evapotranspiration Laboratory, Kansas State University, and contribution no. 88, Kansas Water Resources Research Institute, Manhattan, Kans. The U. S. Department of Interior, Office of Water Resources, provided partial support for this research.

2 Formerly Research Associate (presently Assistant Professor of Plant Physiology, Texas A&M University Agricultural Research and Extension Center, Route 5, Box 366, Beaumont, Texas 77706), Assistant Professor of Microclimatology, and Associate Professor of Plant Physiology, respectively, Kansas State University, Manhattan, Kans. 66506.

Received for publication January 17, 1972.




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