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Published in Agron J 59:391-395 (1967)
© 1967 American Society of Agronomy
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Effect of Root Temperature Variation on Growth and Transpiration of Cotton (Gossypium hirsutum L.) Seedlings1

L. E. Nelson2

The roots of 2-day old cotton seedlings growing in nutrient solution were subjected to 24, 18, and 12 C for 4 days and then grown an additional 7.5 days at 24 C. Air temperature was 27 C, the saturation deficits varied between 15 and 17 mb., and light intensity was 600 ft-c. Fresh weights, dry weights, leaf area, and water use decreased as root temperatures decreased. Little or no growth occurred at 12 C during the 4-day treatment period, but growth resumed after return to 24 C and the rate was the same as the 24 C treatment. The detrimental effect of a short period of low root temperature was apparently caused by a reduction in water uptake which in turn decreased leaf expansion.

Key Words: cotton • Gossypium hirsutum • chlorophyll content • cotton seedling growth • root growth • transpiration and water use

1 Joint contribution from the Agronomy Department, Mississippi Agricultural Experiment Station, State College, and the Soil Science Department, North Carolina Agricultural Experiment Station, Raleigh. Published with the approval of the Directors as Journal Contribution No. 1478 and Paper No. 2315 of the Journal Series, respectively. This is a report of research conducted while the author was on sabbatical leave at North Carolina State University, February 1-September 10, 1965.

2 Agronomist, Mississippi Agricultural Experiment Station.

Received for publication January 13, 1967.




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Copyright © 1967 by the American Society of Agronomy.