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模拟水、盐胁迫对沙棘幼苗PSII活力影响的对比研究

, PP. 649-654

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

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Abstract:

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(TRo/RC)和进入电子传递链的能量(ETo/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(Ψo=ETo/TRo和φE0=ETo/ABS)下降的更剧烈,导致效能指数PIABS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。

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