Resistances to Carbon Dioxide and Water Vapour Transfer in Leaves of Different Plant Species
Resistances to Carbon Dioxide and Water Vapour Transfer in Leaves of Different Plant Species
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DOI：
10.1111/j.1399-3054.1965.tb06917.x
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发表时间：
1965-07
影响因子：
6.4
通讯作者：
P. Holmgren;Paul G. Jarvis;Margaret S. Jarvis
中科院分区：
文献类型：
--
作者：
P. Holmgren;Paul G. Jarvis;Margaret S. Jarvis
本文研究了7种最大光合速率变化范围较大的木本或草本植物的光饱和净光合作用与天然二氧化碳浓度的关系。在大多数情况下，光合作用的速率是线性相关的环境中的二氧化碳浓度高达300 ppm，但在一些叶片的光饱和率低的净光合作用，化学过程的速率似乎也是有限的。当光合作用仅受从环境空气到叶绿体反应位点的二氧化碳转移速率的限制时，可以计算出二氧化碳转移的阻力。种间净光合速率的差异是由气孔阻力和叶肉阻力的差异引起的，但气孔阻力的差异远大于叶肉阻力的差异。种内最小气孔阻力的变异在某些情况下是相当大的，而叶肉阻力的变异一般较小。通过下口叶的近轴角质层吸收二氧化碳的光可以忽略不计或检测不到。角质层蒸腾，另一方面，明显不同，在某些情况下，在物种之间。强光可增加表皮对水蒸气传递的阻力，而将叶温从17 ℃提高到22 ℃则可降低表皮对水蒸气传递的阻力。
The factors limiting light-saturated net photosynthesis al natural carbon dioxide concentrations were examined in seven woody or herbaceous species possessing a wide range of maximum photosynthetic rates. In most cases the rate of photosynthesis was linearly related to the ambient carbon dioxide concentration up to 300 ppm, but in some leaves with a low light-saturated rate of net photosynthesis, the rates of chemical processes also seemed to be limiting. When photosynthesis was limited only by the rate of transfer of carbon dioxide from the ambient air to the reaction sites in the chloroplasts, the resistances to carbon dioxide transfer could be calculated. The differences among the species in net photosynthetic rates were caused by differences in both stomatal and mesophyll resistance but the variation in the stomatal resistance was considerably larger than the variation in the mesophyll resistance. Within the species the variation in the minimum stomatal resistance was rather large in some cases whereas the variation in the mesophyll resistance was generally small. Uptake of carbondioxide in light through the adaxial cuticle of hypostomatous leaves was negligible or undetectable. Cuticular transpiration, on the other hand, varied appreciably both among and, in some cases, within species. The cuticular resistance to water vapour transfer was increased by intense light and reduced by increasing the leaf temperature from 17 to 22 C.