氧气对沙漠植物光合作用和碳代谢的影响。
Oxygen effects on photosynthesis and C metabolism in desert plants.
作者信息
Glacoleva T A, Zalensky O V
机构信息
Laboratory of Photosynthesis, Komarov Botanical Institute, The USSR Academy of Sciences, Leningrad, USSR.
出版信息
Plant Physiol. 1978 Aug;62(2):204-9. doi: 10.1104/pp.62.2.204.
The effect of 1% and 21% O(2) upon (14)CO(2) assimilation by desert plants exposed for 10 to 90 seconds has been studied. The plants studied can be divided into three groups with respect to O(2). The C(3) plants display the usual Warburg effect. No changes could be observed in the intensity of photosynthesis as a function of O(2) content in another group of plants (showing signs of Crassulacean acid metabolism). In still another group of plants (C(4) plants) the stimulating effect of O(2) on photosynthesis could be detected. In C(3) plants, O(2) inhibits the processing of carbon through the Calvin cycle intermediates. The involvement of carbon in the glycolate pathway fails to explain completely the inhibiting effect of O(2) on photosynthesis. It is assumed that O(2) inhibits the enzymes of the Calvin cycle. In C(4) plants O(2) stimulates the incorporation of (14)C into malate and aspartate. The incorporation of (14)C into the intermediates of the Calvin cycle in C(4) plants is inhibited much like that in typical C(3) plants.
研究了1%和21%的氧气对暴露10至90秒的沙漠植物吸收¹⁴CO₂的影响。就氧气而言，所研究的植物可分为三组。C₃植物表现出典型的瓦布格效应。在另一组植物（显示出景天酸代谢迹象）中，未观察到光合作用强度随氧气含量的变化。在又一组植物（C₄植物）中，可检测到氧气对光合作用的刺激作用。在C₃植物中，氧气抑制通过卡尔文循环中间产物的碳代谢过程。碳参与乙醇酸途径并不能完全解释氧气对光合作用的抑制作用。据推测，氧气抑制卡尔文循环的酶。在C₄植物中，氧气刺激¹⁴C掺入苹果酸和天冬氨酸。与典型的C₃植物一样，C₄植物中¹⁴C掺入卡尔文循环中间产物的过程受到抑制。
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