Effect of boundary layer conductance on the response of stomata to humidity
作者:
J. A. BUNCE,
期刊:
Plant, Cell&Environment
(WILEY Available online 1985)
卷期:
Volume 8,
issue 1
页码: 55-57
ISSN:0140-7791
年代: 1985
DOI:10.1111/j.1365-3040.1985.tb01209.x
出版商: Blackwell Publishing Ltd
关键词: Glveine max;Abutilon theophrasti;Datura stramonium;wind;vapour pressure deficit;stomatal conductance
数据来源: WILEY
摘要:
Abstract.Leaf conductance responses to leaf to air water vapour partial pressure difference (VPD) have been measured at air speeds of 0.5 and 3.0 ms−1in single attached leaves of three species in order to test the hypothesis that leaf conductance response to VPD is controlled by evaporation from the outer surface of the epidermis, rather than by evaporation through stomata. Total conductance decreased linearly with increassing VPD at both air speeds, but was decreased 1.6 3.0 times as much as by a given incrase in VPD at high than at low air speed. depending on species. In all species the relationship between leaf conductance and the gradient for evaporation from the epidermis was the same at both values of boundary layer conductance, supporting the hypothesis that direct epidermal evaporation controls stomatal guard cell behaviour in responses of stomata to VPD in these specie
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