模拟水、盐胁迫对沙棘幼苗PSII活力影响的对比研究

干旱区研究 ›› 2011, Vol. 28 ›› Issue (4): 649-654.

模拟水、盐胁迫对沙棘幼苗PSII活力影响的对比研究

李利¹, 吕湘芳¹, 潘响亮¹, 李宏², 陈宝军³

1. 中国科学院新疆生态与地理研究所, 新疆乌鲁木齐 830011;
2. 新疆林业科学院, 新疆乌鲁木齐 830000;
3. 新疆策勒县林业局, 新疆策勒 848300

收稿日期:2010-09-10 修回日期:2010-12-15 出版日期:2011-08-25 发布日期:2011-09-06
作者简介:李利(1969-),甘肃天水人,博士,副研究员,主要从事植物逆境生理方面的研究.E-mail:hillwll@163.com
基金资助:
国家重点基础研究发展计划项目(2006CB705809)资助

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

LI Li¹, LV Xiang-fang¹, PAN Xiang-liang¹, LI Hong², CHEN Bao-jun³

1. Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China;
2. Xinjiang Academy of Forestry, Urumqi 830000, China;
3. Qira County Forestry Bureau, Qira 848300, Xinjiang, China

Received:2010-09-10 Revised:2010-12-15 Published:2011-08-25 Online:2011-09-06

摘要/Abstract

摘要： 通过PEG-6000和NaCl模拟试验,研究了水分和盐分胁迫对沙棘幼苗叶片光系统II(PSII)活力的影响。结果显示:2种胁迫抑制了PSII受体侧的电子传递,减少进入电子传递链的能量流,抑制叶绿素的合成,但对单位面积反应中心密度影响不大。不同的胁迫对沙棘叶片PSII活力的影响程度不同:在NaCl胁迫下,单位反应中心吸收的能量(ABS/RC)、捕获的能量(TR_o/RC)和进入电子传递链的能量(ET_o/RC)均高于PEG胁迫,但是由于分配进入电子传递链的能量比率(Ψ_o=ET_o/TR_o 和φE₀=ET_o/ABS)下降的更剧烈,导致效能指数PI_ABS的显著降低,使得盐分胁迫比水分胁迫更强烈地抑制了PSII的活力,这显示了盐离子的毒害效应。

关键词: 沙棘(Hippophae rhamnoides), 水分胁迫, 盐分胁迫, PSII活力

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

中图分类号:

Q945.78

李利, 吕湘芳, 潘响亮, 李宏, 陈宝军. 模拟水、盐胁迫对沙棘幼苗PSII活力影响的对比研究[J]. 干旱区研究, 2011, 28(4): 649-654.

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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