Understanding down-regulation of photosynthesis under water stress:: future prospects and searching for physiological tools for irrigation management
Understanding down-regulation of photosynthesis under water stress:: future prospects and searching for physiological tools for irrigation management
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DOI：
10.1111/j.1744-7348.2004.tb00343.x
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发表时间：
2004-01-01
影响因子：
2.6
通讯作者：
Medrano, H
中科院分区：
文献类型：
--
作者：
Flexas, J;Bota, J;Medrano, H
水分胁迫条件下的光合作用下调和/或抑制是干旱地区植物生长、存活和产量的决定因素。回顾了目前关于严重水分胁迫下导致光合作用完全抑制的代谢事件序列的知识。对已发表数据的分析表明，在水分胁迫条件下，Rubisco 在光合作用中发挥关键调节作用是不可能的。相比之下，其他卡尔文循环酶的可用数据很少，表明一些参与 RuBP 再生的酶可能发挥关键调节作用。没有足够的数据来确定光磷酸化的作用。强调了我们在这一领域的知识中的几个重要差距。最重要的是关于除 Rubisco 之外的光合酶在水分胁迫下的调节/抑制的数据显着缺乏。因此，迫切需要新的实验来提高我们目前对水分胁迫下光合作用下调的认识。第二个差距是缺乏对遭受不同阶段水分胁迫的植物灌溉后光合作用恢复的了解。为了将水分胁迫引起的生理下调与受控灌溉计划相匹配，这些知识是必要的。
Photosynthetic down-regulation and/or inhibition under water stress conditions are determinants for plant growth, survival and yield in drought-prone areas. Current knowledge about the sequence of metabolic events that leads to complete inhibition of photosynthesis under severe water stress is reviewed. An analysis of published data reveals that a key regulatory role for Rubisco in photosynthesis is improbable under water stress conditions. By contrast, the little data available for other Calvin cycle enzymes suggest the possibility of a key regulatory role for some enzymes involved in the regeneration of RuBP. There are insufficient data to determine the role of photophosphorylation.Several important gaps in our knowledge of this field are highlighted. The most important is the remarkable scarcity of data about the regulation/inhibition of photosynthetic enzymes other than Rubisco under water stress. Consequently, new experiments are urgently needed to improve our current understanding of photosynthetic down-regulation under water stress. A second gap is the lack of knowledge of photosynthetic recovery after irrigation of plants which have been subjected to different stages of water stress. This knowledge is necessary in order to match physiological down-regulation by water stress with controlled irrigation programmes.