Effect of Environmental Factors on Cuticular Transpiration Resistance

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Abstract
Measurements of the various diffusive resistances to water vapor transport within the leaves of sunflower plants (Helianthus annuus) growing in a controlled environment chamber, were used to calculate values of cuticular resistance under a range of environmental conditions. Cuticular resistance to water loss was found to be inversely related to the relative humidity of the surrounding air, and it is suggested that such a mechanism would form a useful adaptation to arid conditions, enabling plants to maintain a more favorable internal water balance.

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