Crop Science Journal of Natural Resources and Life Sciences Education
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Published in Crop Sci 12:87-90 (1972)
© 1972 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Some Metabolic Phenomena of Kentucky Bluegrass Under High Temperature1

T. L. Watschke, R. E. Schmidt, E. W. Carson and R. E. Blaser2

Plugs of 10 Kentucky bluegrass (Poa pratensis L.) strains grown in a controlled environmental growth chamber for 4 weeks at 23 to 15 C, and these temperatures were shifted to 35 to 25 C for 4 additional weeks. Foliar production and carbohydrates were reduced rapidly at high temperatures. By the end of the 3rd week these reductions decreased as threshold carbohydrate levels were apparently approached. Photosynthesis differed among the strains at 35 C in normal air. Low oxygen concentrations inhibited photorespiration and caused nearly two-fold increases in net photosynthesis. Dark respiration, measured with CO2-free air, differed among the strains. Carbon dioxide compensation points were measured in a closed system and did not differ at 35 C. Bluegrasses with best growth at high temperatures generally had higher photosynthesis and lower respiration (both light and dark) than grasses with poor growth at high temperature. Management periods can influence tolerance; however, bluegrasses with genetically high photosynthetic efficiency should be selected for use in areas of high temperature stresses.

Key Words: Carbohydrates • Dark respiration • Plant growth • Photosynthesis • Compensation point

1 Contribution by the Department of Agronomy. Virginia Polytechnic Institute and State University, Blacksburg, Va. 24061. Part of a thesis submitted by the senior author in partial fulfillment of the requirements for the Ph.D. degree at Virginia Polytechnic Institute and State University.

2 Formerly NDEA Pre-doctoral Fellow (now Assistant Professor of Turfgrass Science, The Pennsylvania State University, University Park, Pennsylvania, 16802), Associate Professors, and Professor of Agronomy, respectively, Virginia Polytechnic Institute and State University, Blacksburg, Va. 24061.

Received for publication June 26, 1971.




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