Department of Biology, Queen's University, Kingston, Ontario K7L 3N6 Canada.
Plant Physiol. 1979 Sep;64(3):354-60. doi: 10.1104/pp.64.3.354.
The relationship between photosynthesis and photorespiration was determined in normal and 26 mutants of barley (Hordeum vulgare L. var. Himalaya). The rate of apparent photosynthesis ranged from 1 to 30 milligrams of CO(2) per square decimeter per hour. The variation in rate of photosynthesis was due, in some cases, to differences in chlorophyll content, in others to stomatal resistance, and in still others to unknown factors; but no single factor accounted for the variation. Photorespiratory activity, as determined by the (14)CO(2)/(12)CO(2) technique, CO(2) evolution into CO(2)-free air, and the response of photosynthesis to low and high O(2) concentrations, was positively and significantly correlated with photosynthesis. This supports the idea that the two processes are integrally and tightly coupled. There appears to be no competition between photosynthesis and photorespiration, and the probability of finding plants with high rates of photosynthesis and low rates of photorespiration measured under natural conditions, appears to be very low.
在正常条件下和 26 种大麦（Hordeum vulgare L. var. Himalaya）突变体中，测定了光合作用和光呼吸之间的关系。表观光合作用速率范围为每小时每平方分米 1 至 30 毫克 CO(2)。光合作用速率的变化，在某些情况下是由于叶绿素含量的差异，在其他情况下是由于气孔阻力，在其他情况下是由于未知因素；但没有一个单一的因素可以解释这种变化。通过 (14)CO(2)/(12)CO(2) 技术、CO(2) 向无 CO(2)空气中的释放以及光合作用对低氧和高氧浓度的反应来测定的光呼吸活性，与光合作用呈正相关且显著相关。这支持了这两个过程是整体和紧密耦合的观点。光合作用和光呼吸之间似乎没有竞争，而且在自然条件下，发现具有高光合作用速率和低光呼吸速率的植物的可能性似乎非常低。
