Abstract The temperature dependence of the light-saturated rate of photosynthesis has large interspecific and intraspecific variations, which may be related to adaptation to the habitat environment. As both higher latitude and altitude have lower habitat temperature, we addressed the question of whether temperature adaptation is similar between high-latitude and high-altitude ecotypes. We raised three ecotypes of Fallopia japonica collected from high-latitude and low-altitude (Hirosaki), high-altitude and low-latitude (Fuji), and low-altitude and low-latitude (Tokyo) habitats at two growth temperatures, and determined the temperature dependence of photosynthesis and related biochemical and physical traits, including mesophyll conductance. Temperature dependence of photosynthesis and related traits differed among ecotypes, but the difference was not significant between Fuji and Tokyo when grown at a low-temperature. The simulation analysis suggested that the temperature dependence of Rubisco activity and the CO2 concentration in the chloroplasts had large contributions to the variation in the temperature dependence of photosynthesis. We conclude that both ecotypes from high-altitude and high-latitude habitats tend to have a temperature dependence of photosynthesis which is adaptive to low-temperature conditions, but the mechanisms to adapt to high-altitude are not necessarily the same as compared with those to high-latitude.

中文翻译：

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粳稻光合作用温度依赖性生化机制的纬度和海拔变化

摘要 光合作用光饱和速率的温度依赖性具有较大的种间和种内变异，这可能与对生境环境的适应有关。由于较高纬度和海拔较高的栖息地温度较低，我们解决了高纬度和高海拔生态型之间的温度适应是否相似的问题。我们从高纬度和低纬度（弘前）、高纬度和低纬度（富士）、低纬度和低纬度（东京）栖息地收集了三种生态型粳稻，在两种生长温度下进行饲养，并确定光合作用和相关生化和物理特性的温度依赖性，包括叶肉电导。光合作用和相关性状的温度依赖性因生态型而异，但在低温下生长时，富士和东京之间的差异并不显着。模拟分析表明，Rubisco 活性的温度依赖性和叶绿体中的 CO2 浓度对光合作用温度依赖性的变化有很大贡献。我们得出结论，来自高海拔和高纬度栖息地的生态型都倾向于具有适应低温条件的光合作用的温度依赖性，但适应高海拔的机制与适应低温条件的机制不一定相同。高纬度。模拟分析表明，Rubisco 活性的温度依赖性和叶绿体中的 CO2 浓度对光合作用温度依赖性的变化有很大贡献。我们得出结论，来自高海拔和高纬度栖息地的生态型都倾向于具有适应低温条件的光合作用的温度依赖性，但适应高海拔的机制与适应低温条件的机制不一定相同。高纬度。模拟分析表明，Rubisco 活性的温度依赖性和叶绿体中的 CO2 浓度对光合作用温度依赖性的变化有很大贡献。我们得出结论，来自高海拔和高纬度栖息地的生态型都倾向于具有适应低温条件的光合作用温度依赖性，但适应高海拔的机制与适应低海拔的机制不一定相同。高纬度。