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Effects of NaCl stress on photosynthesis characteristics and fast chlorophyll fluorescence induction dynamics of Pistacia chinensis  leaves.

LI Xu-xin1, LIU Bing-xiang1, GUO Zhi-tao2, CHANG Yue-xia1, HE Lei2, CHEN Fang2, LU Bing-she2,3   

  1. (1College of Forestry, Agricultural University of Hebei, Baoding 071001, Hebei, China; 2College of Landscape Architecture and Tourism, Agricultural University of Hebei, Baoding 071001, Hebei, China; 3Hebei Province Key Laboratory of Genetic Resource of Forest and Forest Protection, Baoding 071001, Hebei, China).
  • Online:2013-09-18 Published:2013-09-18

Abstract: By using fast chlorophyll fluorescence induction dynamics analysis technique (JIP-test), this paper studied the photosynthesis characteristics and fast chlorophyll fluorescence induction dynamics of 1-year old Pistacia chinensis  seedlings under the stress of NaCl at the concentrations 0% (CK), 0.15%, 0.3%, 0.45%, and 0.6%. With the increasing concentration of NaCl, the contents of Chl a, Chl b, and Chl (a+b) in the seedlings leaves decreased, the Chl a/b ratio decreased after an initial increase, and the carotenoid content increased. The net photosynthetic rate (Pn) and stomatal conductance (gs) decreased gradually with increasing NaCl concentration. The decrease of Pn was mainly attributed to the stomatal limitation when the NaCl concentration was lower than 0.3%, and to the nonstomatal limitation when the NaCl concentration was higher than 0.3%. The trapped energy flux per RC (TRo/CSo), electron transport flux per RC (ETo/CSo), density of RCs (RC/CSo), and yield or flux ratio (ψo or φEo) decreased, but the absorption flux per CS (ABS/CSo) and the K phase (Wk) and J phase (Vj) in the O-J-I-P chlorophyll fluorescence induction curves increased distinctly, indicating that NaCl stress damaged the leaf oxygenevolving complex (OEC), donor sides, and PSⅡ reaction centers. When the NaCl concentration reached 0.3%, the maximum photochemical efficiency (Fv/Fm) and performance index (PIABS) decreased 17.7% and 36.6%, respectively, as compared with the control.