Chinese Bulletin of Botany ›› 2007, Vol. 24 ›› Issue (02): 154-160.

• 研究论文 • Previous Articles     Next Articles

Response of Photosynthesis Function of Salt Cress and Arabidopsis to NaCl Salt Stress

Xin Zhao, Yuxia Wu, Mingui Zhao, Jianxin He   

  1. 1 Shapotou Station, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences,Lanzhou 730000, China;2 Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China;3 Life School of Lanzhou University, Lanzhou 730000, China
  • Received:2006-06-09 Revised:2006-10-04 Online:2007-03-01 Published:2007-03-01
  • Contact: Xin Zhao

Abstract: This paper covers study of the response of photosynthetic function of salt cress (Ghellungiella halophila) and Arabidopsis seedlings in NaCl salt stress. The ratios of Chl a/Chl b and Car/Chl increased in salt-cress seedlings with increasing salt concentration level but were significantly higher in salt cress than in Arabidopsis. The photosynthetic rate (Pn) did not decline in salt cress seedling leaves, and Pn was enhanced at lower NaCl concentrations, but the Pn, Gs and Ci values were decreased in Arabidopsis leaves with increasing salt concentration; the stoma factor is the main reason for Arabidopsis leaves inhibiting photosynthesis function with salt stress. A concentration of 50-200 mmol.L-1 of salt stress greatly reduced the capacity of light energy and chloroplasts, electron transport rate of PSII, efficiency of primary conversion of light energy and the coefficient of photochemical fluorescence quenching (qP) in Arabidopsis leaves. The concentration also blocked the process of transforming light energy to chemical energy in photosynthesis function and led to decreased capacity of oxygen evolution and carbon assimilation. But salt cress leaves can overcome these restrictions, and the photosynthesis function was not destroyed seriously.