Lec10TranspirationAndWaterStress

At 30c a leaf may transpire three times as fast as it

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Unformatted text preview: n • Temperature and humidity = vapor pressure deficit – Plants transpire more rapidly at higher temperatures because there is a greater VPD possible as the temperature rises. • At 30°C, a leaf may transpire three times as fast as it does at 20°C. Transpiration Environmental Factors that Affect the Rate of Transpiration • Wind – When there is no breeze, the air surrounding a leaf becomes increasingly humid thus reducing the rate of transpiration. – When a breeze is present, the humid air is carried away and replaced by drier air. • Water vapor diffusion rate increases so when it is open you lose more air when the wind is moving. http://www.botany.hawaii.edu/faculty/Webb/BOT470/ Transpiration Environmental Factors that Affect the Rate of Transpiration T Text • Soil water – A plant cannot continue to transpire rapidly if its water loss is not made up by replacement from the soil. • When absorption of water by the roots fails to keep up with the rate of transpiration, loss of turg...
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This document was uploaded on 01/17/2014.

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