叶片水分亏缺对净二氧化碳同化的气孔和非气孔调节的影响
Effect of leaf water deficit on stomatal and nonstomatal regulation of net carbon dioxide assimilation.
作者信息
Mederski H J, Chen L H, Curry R B
机构信息
Departments of Agronomy and Agricultural Engineering, Ohio Agricultural Research and Development Center, Wooster, Ohio 44691.
出版信息
Plant Physiol. 1975 Apr;55(4):589-93. doi: 10.1104/pp.55.4.589.
Abstract
The effect of leaf water deficit on net CO(2) assimilation was studied under two conditions: in one, the stomata were allowed to contribute to the regulation of CO(2) assimilation; in the other, air was forced through the leaf at a constant rate to overcome the effects of change in stomatal resistance accompanying changes in leaf water deficit. When the stomata were allowed to regulate the gaseous diffusive resistance of the leaf, CO(2) assimilation decreased with increasing leaf water deficit. However, when air was forced through the leaf, the rate of assimilation was not inhibited by increasing leaf water deficit. The results indicate that the inhibition of net CO(2) assimilation with increasing leaf water deficit is a consequence of an increase in the diffusive resistance to gas exchange and not of a change in apparent mesophyll resistance.
摘要
在两种条件下研究了叶片水分亏缺对净二氧化碳同化的影响
一种条件下，气孔可参与调节二氧化碳同化；另一种条件下，以恒定速率强制空气通过叶片，以克服伴随叶片水分亏缺变化的气孔阻力变化的影响。当气孔能够调节叶片的气体扩散阻力时，随着叶片水分亏缺增加，二氧化碳同化减少。然而，当强制空气通过叶片时，同化速率并未因叶片水分亏缺增加而受到抑制。结果表明，随着叶片水分亏缺增加对净二氧化碳同化的抑制是气体交换扩散阻力增加的结果，而非叶肉表观阻力变化的结果。
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