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Published in Crop Sci 11:426-427 (1971)
© 1971 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Effect of Leaf Pubescence on Transpiration, Photosynthetic Rate and Seed Yield of Three Near-Isogenic Lines of Soybeans1

S. R. Ghorashy, J. W. Pendleton, R. L. Bernard and M. E. Bauer2

Apparent photosynthesis (AP), transpiration (TR) and seed yield were determined under field conditions for three near-isogenic lines (isolines) of ‘Clark’ soybeans (Glycine max (L.) Merr.) differing in pubescence. AP of fully expanded leaves near the top of the plant and TR of individual plants were measured during the flowering stage.

Seed yields artd AP rates were not affected by pubescence but the dense pubescent isoline had lower transpiration rates than the normal or glabrous isoline.

Key Words: Water use • Soybean trichomes

1 Joint contribution of the Department of Agronomy, University of Illinois, Urbana, Illinois, and the Plant Science Research Division, Agricultural Research. U.S. Dept. of Agriculture, as No. 674 of the U.S. Regional Soybean Laboratory. This research was supported in part by CSRS Grant 716-15-10, U.S. Department of Agriculture and the National Soybean Crop Improvement Council.

2 Research Assistant (now Assistant Professor of Crop Science, Pahlavi University, Shiraz, Iran); Professor of Agronomy, University of Illinois (now Professor of Agronomy, University of Wisconsin): Geneticist, Plant Science Research Division, Agricultural Research Service, U.S. Department of Agriculture; and Research Assistant (now Research Agronomist, Laboratory for Application of Remote Sensing, Purdue University, Lafayette, Indiana), respectively.

Received for publication November 9, 1970.




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