Adaptability to elevated temperature and nitrogen addition is greater in a high-elevation population than in a low-elevation population of Hippophae rhamnoides

作者：Li, Yan; Zhao, Hongxia; Duan, Baoli; Korpelainen, Helena; Li, Chunyang^*

来源：Trees - Structure and Function, 2011, 25(6): 1073-1082.

DOI：10.1007/s00468-011-0582-6

• Antioxidant enzymes
• Chlorophyll pigments
• Gas exchange
• Growth responses
• Water use efficiency

Hippophae rhamnoides L. is a broadleaf deciduous woody shrub occurring in southwest China, where it has been widely used in ecological restoration. In this study we investigated growth and physiological responses of 2-year-old healthy seedlings to elevated temperature, nitrogen (N) addition and their combination in two contrasting populations from high and low elevations. In closed-top chamber experiments, two populations were subjected to two temperature conditions (ambient temperature and temperature elevated by 2.2 +/- 0.2 degrees C) and two N levels (0 and 25 g N m(-2) a(-1)). Compared with the control, increases in total leaf area (TLA), total chlorophyll content (TC), light-saturated photosynthetic rate (P-max), guaiacol peroxidase activity (POD), catalase activity (CAT) and carbon isotope composition (delta C-13) were greater in the high-elevation population than in the low-elevation population under elevated temperature. On the other hand, decreases in root and shoot biomass ratio (RS), TC, P-max, light saturation point (L-SP), light compensation point (L-CP), superoxide dismutase (SOD), POD, CAT and delta C-13 were lower in the high-elevation population than in the low-elevation population under N addition. Moreover, the combination of elevated temperature and N addition decreased RS, P-max, apparent quantum efficiency (Phi), SOD, POD and delta C-13 significantly more in the low-elevation population than in the high-elevation population. These results demonstrated that there are different adaptive strategies among H. rhamnoides populations, the high-elevation population exhibiting higher adaptability to elevated temperature and N addition than the low-elevation population.

• 出版日期2011-12
• 单位中国科学院; 中国科学院成都生物研究所