The latitudinal and altitudinal variations in the biochemical mechanisms of temperature dependence of photosynthesis within Fallopia japonica
The latitudinal and altitudinal variations in the biochemical mechanisms of temperature dependence of photosynthesis within Fallopia japonica
复制标题
日本输卵管光合作用温度依赖性生化机制的纬度和海拔变化
DOI：
10.1016/j.envexpbot.2020.104248
复制
发表时间：
2021
影响因子：
5.7
通讯作者：
Hikosaka Kouki
中科院分区：
文献类型：
--
作者：
Machino Satoshi;Nagano Soichiro;Hikosaka Kouki
光饱和光合速率的温度依赖性在种间和种内都存在较大的变异，这可能与对生境环境的适应有关。由于高纬度和高海拔都有较低的栖息地温度，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。以高纬低纬（广崎）、高纬低纬（富士）和低纬低纬（东京）3个生境的3种生态型日本番荔枝（Fallopia japonica）为试材，在2种生长温度下，测定了其光合作用及叶肉导度等生理生化性状的温度依赖性。光合作用及相关性状的温度依赖性在不同生态型间存在差异，但在低温下生长时富士和东京的差异不显著。模拟分析表明，Rubisco活性的温度依赖性和叶绿体中CO2浓度对光合作用温度依赖性的变化有较大贡献。结果表明，高海拔和高纬度生境下的两种生态类型的光合作用都具有温度依赖性，对低温条件具有适应性，但高海拔和高纬度生境下的适应机制并不完全相同。
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 ofFallopia japonicacollected 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 CO2concentration 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.