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This article in AJ

  1. Vol. 59 No. 5, p. 391-395
     
    Received: Jan 13, 1967
    Published: Sept, 1967


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doi:10.2134/agronj1967.00021962005900050002x

Effect of Root Temperature Variation on Growth and Transpiration of Cotton (Gossypium hirsutum L.) Seedlings1

  1. L. E. Nelson2

Abstract

Abstract

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.

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