Drought-inhibition of photosynthesis in C3 plants:: Stomatal and non-stomatal limitations revisited
Drought-inhibition of photosynthesis in C3 plants:: Stomatal and non-stomatal limitations revisited
复制标题
DOI：
10.1093/aob/mcf027
复制
发表时间：
2002-02-01
期刊：
影响因子：
4.2
通讯作者：
Medrano, H
中科院分区：
文献类型：
--
作者：
Flexas, J;Medrano, H
干旱是否限制了C-3植物通过气孔关闭或代谢损伤进行的光合CO2同化，这是一个长期存在的争议。由于光合作用对叶片水势和/或相对含水量（RWC）的响应在种间存在差异，比较不同研究的结果是困难的，RWC是评估干旱严重程度的最常用参数。因此，我们在不同的研究中用气孔导度(g)作为比较代谢过程的基础。其逻辑是，由于g和光合作用之间有很强的联系（可能是它们之间的共同调节），因此，在不同的物种和研究中，RWC或水势与光合速率和代谢变化之间的不同关系可以通过将它们与g联系起来而“正常化”。重新分析文献中的数据，使用光饱和g作为植物水分亏缺的参数，表明干旱诱导的不同光合子过程的抑制与g.二磷酸核酮糖（RuBP）和腺苷含量之间存在良好的对应关系三磷酸（ATP）在干旱发展早期减少，但仍相对较高(高于150 mmol H2O m（-2) s(-1)）。这表明RuBP再生和ATP合成受损。光化学和Rubisco活性的降低通常发生在较低的g (
There is a long-standing controversy as to whether drought limits photosynthetic CO2 assimilation through stomatal closure or by metabolic impairment in C-3 Plants. Comparing results from different studies is difficult due to interspecific differences in the response of photosynthesis to leaf water potential and/or relative water content (RWC), the most commonly used parameters to assess the severity of drought. Therefore, we have used stomatal conductance (g) as a basis for comparison of metabolic processes in different studies. The logic is that, as there is a strong link between g and photosynthesis (perhaps co-regulation between them), so different relationships between RWC or water potential and photosynthetic rate and changes in metabolism in different species and studies may be 'normalized' by relating them to g. Re-analysing data from the literature using light-saturated g as a parameter indicative of water deficits in plants shows that there is good correspondence between the onset of drought-induced inhibition of different photosynthetic sub-processes and g. Contents of ribulose bisphosphate (RuBP) and adenosine triphosphate (ATP) decrease early in drought development, at still relatively high g (higher than 150 mmol H2O m(-2) s(-1)). This suggests that RuBP regeneration and ATP synthesis are impaired. Decreased photochemistry and Rubisco activity typically occur at lower g (