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Articles

Effect of Environmental Factors on Cuticular Transpiration Resistance ¹

^a Division of Agricultural Meteorology, Volcani Institute of Agricultural Research, Rehovot, Israel

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.

¹ This work was supported in part by PL 480 Grant A10-SWC-29 from the United States Department of Agriculture. Contribution from the Volcani Institute of Agricultural Research, Bet Dagan, Israel. 1970 Series No. 1732-E.

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