温度变化下银白杨叶片中线粒体呼吸对光合作用和异戊二烯释放的影响

Effects of Mitochrial Respiration on Photosynthesis and Emission of Isoprene under Various Temperatures in Leaves of Populus alba L.

温度的升高增加了银白杨叶片异戊二烯的释放水平;随着温度的升高,线粒体呼吸速率则有所下降。用线粒体呼吸途径的抑制剂处理叶片能够增加叶片异戊二烯的释放水平;然而,同样的处理对光系统Ⅱ叶绿素荧光参数并没有显著性的影响,并降低了叶片的光合速率。基于以上结果,本文认为在温度上升时,异戊二烯的释放可能并不依赖于光合作用,而线粒体呼吸的上游底物流向异戊二烯的合成路径可能促进了温度上升时异戊二烯释放的增加。

The level of isoprene emission in Populus alba increased with the increase of temperature, while mi- tochondrial respiration decreased. Under various temperature, the treatments of the chemical inhibitors of mito- chondrial respiration pathway further enhanced the isoprene emission in leaves. However, the same treatments had little effects on the photosystem II chlorophyll fluorescence, but decreased photosynthetic rate. Based on these above results, it was proposed that when the temperature rose, the isoprene emission could be independent on photosynthesis, and the biosynthetic pathway in which the upstream substrate of mitochondrial respiration flowed to the isoprene contributed to the increase of isoprene emission.