光呼吸测量中循环利用的评估。
An evaluation of the recycling in measurements of photorespiration.
作者信息
Gerbaud A, Andre M
机构信息
Laboratoire de Chimie Biologique et de Photophysiologie, INRA 78850 Thiverval-Grignon, France.
出版信息
Plant Physiol. 1987 Apr;83(4):933-7. doi: 10.1104/pp.83.4.933.
All measurements of photorespiration and gross photosynthesis in leaves, whether using isotopes or not, are underestimated because of the recycling of O(2) or CO(2). On the basis of a simple diffusion model, we propose a method for the calculation of the recycling and the corresponding underestimation of the measurements. This procedure can be applied when the stomatal resistance is known, and allows for a correction of certain results in the literature. It is found that measurements of the photorespiratory CO(2) release are usually underestimated by 20 to 100%, which sets the estimated rate of CO(2) photorespired at 30 to 50% of the net photosynthesis in C3 plants under normal conditions. In water stress studies, the correction of the photorespiration is still more important (1.5-3.3) because the stomata are closed more. Analysis of the diffusion of O(2) shows that its recycling is low and that the underestimation of photorespiration with (18)O(2) is negligible.
无论是否使用同位素，叶片中光呼吸和总光合作用的所有测量值都会因O₂或CO₂的循环利用而被低估。基于一个简单的扩散模型，我们提出了一种计算循环利用以及测量值相应低估程度的方法。当气孔阻力已知时，此程序即可应用，并能对文献中的某些结果进行校正。研究发现，光呼吸CO₂释放量的测量值通常被低估20%至100%，这使得在正常条件下C₃植物中光呼吸的CO₂估计速率为净光合作用的30%至50%。在水分胁迫研究中，光呼吸的校正更为重要（1.5 - 3.3倍），因为气孔关闭得更厉害。对O₂扩散的分析表明，其循环利用率较低，并且用¹⁸O₂测量时光呼吸的低估可忽略不计。
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