Bunce J A
Section of Ecology and Systematics, Cornell University, Ithaca, New York 14850.
Plant Physiol. 1977 Mar;59(3):348-50. doi: 10.1104/pp.59.3.348.
Mesophyll resistance to CO(2) uptake was calculated from gas exchange data on intact leaves of 12 species of woody plants. Plants studied were native to habitats ranging from streamsides to deserts. Gas exchange measurements were made at light saturation and constant temperature to eliminate possible effects of light and temperature on estimates of mesophyll resistance. Cuticular transpiration was measured and used in calculation of stomatal resistances from whole leaf transpiration rates. In all species examined, an increase in mesophyll resistance was observed as leaves dried. The increase in mesophyll resistance in all cases occurred at the same water potential as the initial decline in net photosynthesis, and was accompanied by an increase in stomatal resistance.
根据12种木本植物完整叶片的气体交换数据计算叶肉对二氧化碳吸收的阻力。所研究的植物原产于从溪边到沙漠的各种生境。在光饱和和恒温条件下进行气体交换测量,以消除光照和温度对叶肉阻力估计值的可能影响。测量角质层蒸腾作用,并用于根据全叶蒸腾速率计算气孔阻力。在所有被检查的物种中,随着叶片变干,叶肉阻力增加。在所有情况下,叶肉阻力的增加都发生在净光合作用开始下降时的相同水势下,并且伴随着气孔阻力的增加。