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This article in AJ

  1. Vol. 56 No. 4, p. 405-410
    Received: Jan 24, 1964

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Physiological Role in Regulating Transpiration Rate of the Cotton Plant1

  1. E. L. Skidmore and
  2. J. F. Stone2



A decrease in transpiration rate, which could not be explained on the basis of physical factors of the environment, was observed. Root impedance to water absorption and transmission was found to be approximately five times greater at the time of day when transpiration rate was greatly attenuated than at the time when transpiration was at a maximum. Transpiration rate was directly proportional to evaporative demand early in the day but later in the day when root: impedance was high, an inverse and less well denned relationship existed.

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