THE RELATIONSHIP BETWEEN CO2 ASSIMILATION AND ELECTRON-TRANSPORT IN LEAVES
THE RELATIONSHIP BETWEEN CO2 ASSIMILATION AND ELECTRON-TRANSPORT IN LEAVES
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DOI：
10.1007/bf00033162
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发表时间：
1990-09-01
影响因子：
3.7
通讯作者：
BAKER, NR
中科院分区：
文献类型：
--
作者：
HARBINSON, J;GENTY, B;BAKER, NR
在使用光呼吸和非光呼吸条件的具有不同光合速率的豌豆（Pisum sativum（L））叶中，以及在光呼吸条件下的常春藤（Hedera helix（L））叶中，研究了光系统I（v φ I）和II（v φ II）的量子效率与CO2固定的量子产率（v φ CO2）之间的相互关系。结果表明，在光呼吸条件下，vphi CO2与vphi i和vphi II两者之间的关系是非线性和可变的。在这些情况下，.vphi.i和.vphi.II之间的关系主要保持线性。在非光呼吸条件下，由于库限制而具有低光合速率的叶在v φ I和v φ II之间表现出非线性关系，尽管v φ II和v φ CO2之间的关系保持线性，表明线性电子流和CO2固定之间的密切关系。在CO2补偿点处照射的叶也表现出v φ I和v φ II之间的非线性关系。这些结果表明，在空气中的线性电子流的叶片是代谢的主要能量来源。当线性电子传递产物的要求降低时，考虑了循环电子传递的作用。
The inter-relationships between the quantum efficiencies of photosystems I (.vphi.I) and II (.vphi.II) and the quantum yield of CO2 fixation (.vphi.CO2) were investigated in pea (Pisum sativum (L)) leaves with differing rates of photosynthesis using both photorespiratory and non-photorespiratory conditions, and in a leaf of Hedera helix (L) under photorespiratory conditions. The results indicate that under photorespiratory conditions the relationship between .vphi.CO2 and both .vphi.i and .vphi.II is non-linear and variable. The relationship between .vphi.i and .vphi.II under these circumstances remains predominantly linear. Under non-photorespiratory conditions, leaves with a low rate of photosynthesis due to sink limitation exhibit a non-linear relationship between .vphi.I and .vphi.II, though the relationship between .vphi.II and .vphi.CO2 remains linear suggesting a close relationship between linear electron flow and CO2 fixation. Leaves irradiated at the CO2 compensation point also exhibit a non-linear relationship between .vphi.I and .vphi.II. These results suggest that for leaves in air linear electron flow is the predominant source of energy for metabolism. The role of cyclic electron transport is considered when the requirement for the products of linear electron transport is depressed.