藻类的光合作用和光呼吸。
Photosynthesis and photorespiration in algae.
机构信息
Department of Biology, Queen's University, Kingston, Ontario K7L 3N6.
出版信息
Plant Physiol. 1977 May;59(5):936-40. doi: 10.1104/pp.59.5.936.
Abstract
The CO(2) exchange of several species of fresh water and marine algae was measured in the laboratory to determine whether photorespiration occurs in these organisms. The algae were positioned as thin layers on filter paper and the CO(2) exchange determined in an open gas exchange system. In either 21 or 1% O(2) there was little difference between (14)CO(2) and (12)CO(2) uptake. Apparent photosynthesis was the same in 2, 21, or 50% O(2). The compensation points of all algae were less than 10 mul 1(-1). CO(2) or (14)CO(2) evolution into CO(2)-free air in the light was always less than the corresponding evolution in darkness. These observations are inconsistent with the proposal that photorespiration exists in these algae.
摘要
为了确定光合作用是否发生在这些生物体中，我们在实验室中测量了几种淡水和海洋藻类的 CO(2)交换。将藻类放置在滤纸上的薄层中，并在开放的气体交换系统中确定 CO(2)交换。在 21%或 1%的 O(2)中，(14)CO(2)和(12)CO(2)的吸收几乎没有差异。在 2%、21%或 50%的 O(2)中，表观光合作用相同。所有藻类的补偿点都小于 10 μmol L(-1)。在光下，CO(2)或(14)CO(2)向无 CO(2)空气中的释放总是小于黑暗中的相应释放。这些观察结果与光合作用在这些藻类中存在的观点不一致。
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