Department of Biochemistry, Michigan State University, East Lansing, Michigan 48824.
Plant Physiol. 1976 Aug;58(2):143-6. doi: 10.1104/pp.58.2.143.
Some factors influencing dark respiration, photorespiration, and photosynthesis were examined for their effect on the CO(2) compensation point (70 mul/l) of detached soybean (Glycine max) leaf discs. A higher compensation point in young leaves decreased to the constant value after leaf expansion and maturation, but increased again during senescence. The compensation point was 40 to 50% higher in plants grown in the summer than in the winter. The compensation point and dark respiration increased with temperatures above 17 C. Below 17 C dark respiration continued to decrease, but the compensation point did not decrease further. Increasing light intensities did not affect the compensation point.The effect of selected chemicals on the compensation point were surveyed. Some buffer components did not greatly alter the compensation point but organic solvents lowered it. Potassium phosphate and pyrophosphate greatly increased it. Inhibitors of photosynthesis increased the compensation point. Hydroxypyridinemethanesulfonate and sodium bisulfite severely inhibited photosynthesis in soybean leaves, stimulated dark respiration, and increased the compensation point.
一些影响暗呼吸、光呼吸和光合作用的因素，其对离体大豆叶片 CO2 补偿点（70μl/L）的影响。幼叶的补偿点较高，在叶片展开和成熟后降低到恒定值，但在衰老过程中再次升高。在夏季生长的植物中，补偿点比冬季高 40%到 50%。补偿点和暗呼吸随温度高于 17°C 而增加。在 17°C 以下，暗呼吸继续下降，但补偿点不再进一步下降。增加光强不会影响补偿点。调查了选定化学物质对补偿点的影响。一些缓冲成分对补偿点影响不大，但有机溶剂会降低补偿点。磷酸钾和焦磷酸会大大增加补偿点。光合作用抑制剂会增加补偿点。羟基吡啶甲硫磺酸和亚硫酸氢钠严重抑制大豆叶片的光合作用，刺激暗呼吸，并增加补偿点。
