Fock H, Schaub H, Hilgenberg W, Egle K
Botanisches Institut der Universität Frankfurt a. M., Frankfurt a.M, Deutschland.
Planta. 1969 Mar;86(1):77-83. doi: 10.1007/BF00385306.
Carbon dioxide and oxygen gas exchange of illuminated Amaranthus and Phaseolus leaves was measured from 0-600 ppm of CO2 in an open system.At low oxygen concentration (2% O2) the ratio of CO2 uptake to O2 evolution came close to 1.At high oxygen partial pressure (42% O2) the O2 compensation point of an Amaranthus leaf was increased and oxygen evolution was depressed. Accordingly the CO2/O2 quotients were variable; the lowest value of 1,9 differed significantly from 1,0.The oxygen and carbon dioxide compensation points of a Phaseolus leaf were increased at high oxygen concentration (42% O2) and oxygen evolution as well as carbon dioxide uptake were reduced. Therefore the ratios CO2 over O2 varied and differed greatly from 1,0.It was concluded that the nature of photosynthates is regulated by the gas composition around the leaves.
在开放系统中，测定了光照下苋菜和菜豆叶片在0 - 600 ppm二氧化碳浓度范围内的二氧化碳和氧气气体交换情况。在低氧浓度（2% O₂）下，二氧化碳吸收量与氧气释放量的比值接近1。在高氧分压（42% O₂）下，苋菜叶片的氧气补偿点升高，氧气释放受到抑制。因此，二氧化碳/氧气商数是可变的；最低值1.9与1.0有显著差异。菜豆叶片的氧气和二氧化碳补偿点在高氧浓度（42% O₂）下升高，氧气释放以及二氧化碳吸收均减少。所以，二氧化碳与氧气的比值变化，且与1.0有很大差异。得出的结论是，光合产物的性质受叶片周围气体成分的调节。
