Night-time warming increases photosynthetic capacity of sapling leaf of Cinna-(momum) burmanni grown with different nitrogen supplies
夜间变暖提高荫香叶片的光合能力(英文)

A study was conducted to examine the influence of night-time warming on leaf photosynthetic capacity of Cinnamomum burmanni under different levels of nitrogen supply. When daytime temperature was kept at 25C and the nighttime temperature raised from 18 to 20C, leaf photosynthetic rate of plants increased (p＜0. 05). Plants growing under high night-time temperature and treated with higher nitrogen supply had higher photosynthetic rate than those with lower nitrogen supply. The increments of light and dark respirations in leaves of plant growing under higher night-time temperature and treated with lower nitrogen supply were significant (p＜0.05) compared with those under lower night-time temperature. At both levels of nitrogen supply, the maximum rate of carboxylation catalyzed by Rubisco (V ) and the maximum rate of electron transport (Jmax) of leaf were stimulated when the plant grew under night-time warming (p＜0.05), and nitrogen intensified the increasing effect of night-time warming on V and J Night-time warming reduced specific leaf weight, but increased leaf nitrogen content based on dry weight (Nm), and no similar changes in leaf nitrogen content based on leaf area (Nα) were found. Therein, the future global climate change and night-time warming would be in favor of the enhancement of leaf photosynthetic capacity of the plants that have similar physiological characteristics in South China, and their effect together with higher nitrogen supply would significantly increase carbon fixation.