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中国沙漠  2014 

胡杨（Populuseuphratica）异形叶叶绿素荧光动力学

DOI: 10.7522/j.issn.1000-694X.2014.00007

Keywords: 叶绿素荧光,季节变化,胡杨(Populuseuphratica),披针形叶,卵圆形叶

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Abstract:

荒漠地区的胡杨（Populuseuphratica）叶片为多态形，呈现出由披针形叶到锯齿卵圆形叶的规律性变化。为了研究胡杨异形叶的电子传递和光能吸收、分配和耗散对额济纳荒漠地区的适应特征，分别连续测定了生长季内胡杨两种典型叶片（披针形叶和锯齿卵圆形叶）的叶绿素荧光诱导动力学曲线。结果表明：（1）锯齿卵圆形叶的光系统Ⅱ（PSⅡ）原初光能转换效率（Fv/Fm）和PSⅡ的潜在活性（Fv/Fo）、光能利用参数（PI）高于披针形叶，QA的积累量（Vj）、QA还原的相对速率（Mo）小于披针形叶；（2）锯齿卵圆形叶的反应中心密度（RC/CSo）、单位横截面积上电子传递能量（ETo/CSo）高于披针形叶，单位横截面积上耗散的能量（DIo/CSo）以及单位反应中心上的能量流参数（ABS/RC、ETo/RC、TRo/RC、DIo/RC）低于披针形叶；（3）锯齿卵圆形叶用于光化学反应和电子传递的能量比例（ΦPo、Ψo、ΦEo）大于披针形叶，非光化学猝灭的最大量子产额（ΦDo）小于披针形叶。这说明，胡杨锯齿卵圆形叶相对披针形叶具有更有效的能量分配策略，对极端环境条件的适应性更强。

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