The Cassava Physiology Program, Centro Internacional de Agricultura Tropical (CIAT), Apartado Aereo, 6713, Cali, Colombia, SA.
Photosynth Res. 1984 Sep;5(3):235-42. doi: 10.1007/BF00030024.
Gas exchange measurements and leaf anatomy of 10 cassava cultivars were conducted to study the interrelationship between the relatively high photosynthetic rates and the factors limiting internal CO2 diffusion. The internal mesophyll surface area per unit leaf surface area (A(mes)/A) and the intracellular components of CO2 diffusion and fixation resistance (R(cell)CO2) were determined. Among the group of cultivars tested net CO2 exchange rates were 26±2.5 μmol CO2 m(-2) s(-1) in normal air and intense light and A(mes)/A ranged from 14 to 38. Estimated R(cell)CO2 ranged from 4300 to 13,000 s m(-1). The combined and compensating effects of A(mes)/A and R(cell)CO2 accounted for both the high net photosynthetic rates (Pn) and the lack of large differences in Pn among cultivars.
对 10 个木薯品种的气体交换测量和叶片解剖结构进行了研究，以探讨相对较高的光合速率与限制内部 CO2 扩散的因素之间的相互关系。测定了单位叶面积的内叶肉表面积（A(mes)/A）和 CO2 扩散和固定阻力的细胞内成分（R(cell)CO2）。在测试的品种组中，在正常空气和强光下的净 CO2 交换率为 26±2.5 μmol CO2 m(-2) s(-1)，A(mes)/A 范围为 14 到 38。估计的 R(cell)CO2 范围从 4300 到 13000 s m(-1)。A(mes)/A 和 R(cell)CO2 的综合和补偿作用解释了高净光合速率（Pn）和品种间 Pn 差异不大的原因。
