模拟水、盐胁迫对沙棘幼苗PSII活力影响的对比研究

Abstract

Abstract: Effects of polyethylene Glycol (PEG-6000) and NaCl on PSII activity of Hippophae rhamnoides were investigated by an experiment carried out in greenhouse. Both NaCl and PEG exposure restricted the electron transfer in acceptor, resulted in a decrease of energy yield into electron transfer chain. The two stresses still caused the decrease of chlorophyll content, but had no effect to the density of active photosynthetic reaction centers (RC/CS_o). Compared with PEG treatment, NaCl exposure was higher in absorption flux, trapped energy flux and electron transport flux per excited reaction center (ABS/RC, TR_o/RC, ET_o/RC), but it had lower value in performance index (PI_ABS) due to the decrease in electron transport (φE_o), probability that a trapped exciton moves an electron into the electron transport chain beyond Q^-_A (Ψ_o). Our results suggested that NaCl inhibited more intensely the PSII activity than PEG, as had close relation with specific ion effect of NaCl.

Key words: Hippophae rhamnoides, water stress, salt stress, PSII activity

CLC Number:

Q945.78

LI Li, LV Xiang-fang, PAN Xiang-liang, LI Hong, CHEN Bao-jun. Comparative Study on Effects of NaCl and Polyethylene Glycol on PSII Activity of Hippophae rhamnoides[J]., 2011, 28(4): 649-654.

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Comparative Study on Effects of NaCl and Polyethylene Glycol on PSII Activity of Hippophae rhamnoides

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