Bunce James
Adaptive Cropping Systems Laboratory, USDA-ARS, Beltsville, MD 20705, USA.
Plants (Basel). 2022 Mar 29;11(7):908. doi: 10.3390/plants11070908.
CO is currently a growth-limiting resource for plants with C metabolism, and elevated CO also often reduces stomatal conductance, reducing plant water stress. Increased photosynthesis and improved water status might be expected to result in increased leaf size. It is therefore unexpected that leaf size is in some cases reduced in plants grown at elevated CO, and also unexpected that elevated CO applied only during darkness can increase leaf size. These experiments compared leaf size responses to day and/or night elevated CO in six cultivars of grown with either constant or varying temperature in controlled environment chambers. Diverse responses of leaf size to elevated CO were found among the cultivars, including increased leaf size with elevated CO applied only during darkness in some cultivars and temperature regimes. However, leaf size responses to elevated CO and cultivar differences in response were unrelated to differences in leaf water potential or turgor pressure.
对于具有C代谢的植物而言，CO₂目前是一种限制生长的资源，而CO₂浓度升高通常也会降低气孔导度，减轻植物的水分胁迫。光合作用增强和水分状况改善可能会导致叶片尺寸增大。因此，在CO₂浓度升高条件下生长的植物，其叶片尺寸在某些情况下会减小，这是出乎意料的；而且仅在黑暗期间施加升高的CO₂就能增加叶片尺寸，这也是出乎意料的。这些实验比较了在可控环境箱中，六个品种的植物在恒定或变化温度下，叶片尺寸对白天和/或夜间CO₂浓度升高的响应。在不同品种中发现了叶片尺寸对CO₂浓度升高的多种响应，包括在某些品种和温度条件下，仅在黑暗期间施加升高的CO₂时叶片尺寸增大。然而，叶片尺寸对CO₂浓度升高的响应以及品种间的响应差异与叶片水势或膨压的差异无关。
