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模拟干旱和盐分胁迫对沙枣幼苗PSⅡ活力的影响/Comparative Effects of NaCl and Polyethylene Glycol on PSⅡ Activity of Elaeagnus angustifolia[J]
Authors
LI Hong
LI Li
+6 more
PAN Xiang-liang
中国科学院新疆生态与地理研究所,乌鲁木齐,830011
新疆林业科学院,乌鲁木齐,830000
李利
李宏
潘响亮
Publication date
1 January 2011
Publisher
Abstract
通过PEG-6000和NaCl模拟实验研究了干旱和盐分胁迫对沙枣幼苗叶片光系统Ⅱ(PSⅡ)活力的影响.结果显示:PEG胁迫使沙枣幼苗叶片PSⅡ在300 μs时相对于FJ-Fo的可变荧光比值(Wk)升高,却降低了单位反应中心密度(RC/CSo)和最大量子产量(Fv/Fm),导致效能指数(PIABS)随水势降低而显著下降,阻碍了电子传递链中供体和受体侧的电子传递,也抑制了叶绿素的合成,从而全面抑制PSⅡ的活力;NaCl胁迫对沙枣叶片PSⅡ活力没有显著影响.比较两种处理等渗溶液下的结果发现,盐离子对沙枣叶片PSⅡ活力具有正效应,它抵消了渗透效应对沙枣叶片PSⅡ活力的抑制作用,这可能与盐离子进入叶片细胞,减轻了渗透胁迫有关
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Last time updated on 29/11/2016