RESISTANCE TO TRANSPIRATION OF SITES OF EVAPORATION WITHIN LEAF
RESISTANCE TO TRANSPIRATION OF SITES OF EVAPORATION WITHIN LEAF
复制标题
DOI：
10.1104/pp.61.6.1000
复制
发表时间：
1978-01-01
期刊：
影响因子：
7.4
通讯作者：
RASCHKE, K
中科院分区：
文献类型：
--
作者：
FARQUHAR, GD;RASCHKE, K
研究了棉花、苍耳和玉米叶片上、下表面的蒸腾速率与氦在叶片上扩散的速率。没有证据表明CO2浓度或蒸发速率对蒸发表面的水分流失阻力（叶肉壁对蒸腾的阻力）有影响，也没有证据表明肿胀组织中有任何显著的壁阻力。此外，还对易剥皮的Commelina communis和Tulipa generiana叶片进行了抗壁性试验。只有当叶肉组织的表皮从叶片上去除时，叶肉组织的蒸发量才会下降。显然，在与气孔行为研究相关的条件下，蒸发部位的水汽压等于饱和水汽压。
The rates of transpiration from the upper and lower surfaces of leaves of Gossypium hirsutum, Xanthium strumarium and Zea mays were compared with the rates at which helium diffused across those leaves. There was no evidence for effects of CO2 concentration or rate of evaporation on the resistance to water loss from the evaporating surface (resistance of the mesophyll wall to transpiration) and no evidence for any significant wall resistance in turgid tissues. The possible existence of a wall resistance was also tested in leaves of Commelina communis and Tulipa gesneriana whose epidermis could be easily peeled. Only when an epidermis was removed from a leaf, evaporation from the mesophyll tissue declined. Apparently, under conditions relevant to studies of stomatal behavior, the water vapor pressure at the sites of evaporation is equal to the saturation vapor pressure.