DEPENDENCE OF THE EXTENT AND DIRECTION OF AVERAGE STOMATAL RESPONSE IN ZEA-MAYS L AND PHASEOLUS-VULGARIS L ON THE FREQUENCY OF FLUCTUATIONS IN ENVIRONMENTAL STIMULI
DEPENDENCE OF THE EXTENT AND DIRECTION OF AVERAGE STOMATAL RESPONSE IN ZEA-MAYS L AND PHASEOLUS-VULGARIS L ON THE FREQUENCY OF FLUCTUATIONS IN ENVIRONMENTAL STIMULI
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DOI：
10.1104/pp.105.3.1007
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发表时间：
1994-07-01
期刊：
影响因子：
7.4
通讯作者：
WOODROW, IE
中科院分区：
文献类型：
--
作者：
CARDON, ZG;BERRY, JA;WOODROW, IE
以莱亚玉米和菜豆为材料，研究了气孔对波动光和CO2的响应。缓慢移动的气孔可以影响植物在光flourism，在动态云层覆盖下，在交替的大风和平静的空气条件下（这会影响植物冠层中叶片周围的CO2浓度和湿度），在自然CO2通风口，或在CO2控制不完善的生长室中的碳获得和水分损失。结果发现，在光和CO2的恒定振幅波动的频率显着影响的时间平均气孔导度在玉米和菜豆。在光振荡期间，平均气孔导度被驱动高于或低于在平均光水平下稳态时观察到的气孔导度，这取决于振荡的频率。振荡CO2下，平均气孔导度的偏离，观察到在稳定状态下的平均CO2水平也是频率依赖的两个物种。振荡停止后，光或CO2返回到稳定的中位数水平，气孔导度也恢复到一个稳定的状态，匹配之前的振荡开始。这项工作表明，光和CO2的波动，同样重要的是，它们的频率，可以在不稳定的环境条件下确定时间平均气孔导度的关键。
Stomatal responses to fluctuating light and CO2 were investigated in lea mays and Phaseolus vulgaris. Slow-moving stomata can affect carbon gain and water loss by plants during light flecks, under dynamic cloud cover, during alternating windy and calm air conditions (which influence CO2 concentrations and humidity immediately around leaves in plant canopies), at natural CO2 vents, or in growth chambers with imperfect CO2 control. It was found that the frequency of constant-amplitude fluctuations in light and CO2 dramatically affected the time-averaged stomatal conductance in both Zea and Phaseolus. During oscillations in light, average stomatal conductance was driven either above or below that observed at steady state at the average light level, depending on the frequency of the oscillations. Under oscillating CO2, the departure of average stomatal conductance away from that observed at steady state at the average CO2 level was also frequency dependent in both species. Upon cessation of oscillations and return of light or CO2 to the stable median level, stomatal conductance also returned to a steady state, matching that before oscillations were initiated. This work shows that fluctuations in light and CO2, and equally important, their frequency, can be critical in determining time-averaged stomatal conductance under unstable environmental conditions.