| 胡杨(Populus euphratica)异形叶叶绿素荧光动力学 |
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| 引用本文： | 刘晓晴,常宗强,马亚丽,吴雨霞.胡杨(Populus euphratica)异形叶叶绿素荧光动力学[J].中国沙漠,2014,34(3):704-711. |
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| 作者姓名： | 刘晓晴 常宗强 马亚丽 吴雨霞 |
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| 作者单位： | 1. 中国科学院寒区旱区环境与工程研究所 阿拉善荒漠生态水文试验研究站, 甘肃 兰州 730000;2. 兰州大学 生命科学学院/草地农业生态系统国家重点实验室, 甘肃 兰州 730000 |
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| 基金项目： | 国家自然科学基金项目(31370396,91025024);国家科技支撑计划项目(2012BAC08B05)资助 |
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| 摘 要： | 荒漠地区的胡杨(Populus euphratica)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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| 关 键 词： | 叶绿素荧光 季节变化 胡杨(Populus euphratica) 披针形叶 卵圆形叶 |
| 收稿时间： | 2013-12-12; |
Characteristics of the Fast Chlorophyll Fluorescence Induction Kinetics of Heteromorphic Leaves in Populus euphratica |
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| Liu Xiaoqing,Chang Zongqiang,Ma Yali,Wu Yuxia.Characteristics of the Fast Chlorophyll Fluorescence Induction Kinetics of Heteromorphic Leaves in Populus euphratica[J].Journal of Desert Research,2014,34(3):704-711. |
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| Authors: | Liu Xiaoqing Chang Zongqiang Ma Yali Wu Yuxia |
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| Institution: | 1. Alxa Desert Ecohydrological Experimental Research Station, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou, Lanzhou 730000, China;2. State Key Laboratory of Grassland Agro-ecosystems/School of Life College, Lanzhou University, Lanzhou 730000, China |
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| Abstract: | Populus euphratica has two typical types of heterophylly (lanceolate and dentate broad-ovate) leaves. The characteristics of acclimation in photochemistry, thermal energy dissipation and electron transport in heteromorphic leaves of Populus euphratica Oliver in the Egina desert region were studied by measuring the fast chlorophyll fluorescence induction curves (OJIP). The results indicated that the dentate broad-ovate leaves had the higher maximum photochemical efficiency of photosystem Ⅱ (PSⅡ) (Fv/Fm), potential activity of PSⅡ (Fv/Fo), vitality indices (PI), active reaction centers per cross-section (RC /CSo), electron transport flux per cross-section (ETo/CSo), the fluxes ratios (ΦPo,Ψo,ΦEo). However, the initial slope of fluorescence intensity (M0), fluorescence intensity at the J step (Vj), energy fluxes per reaction center (ABS /RC, ETo/RC, TRo/RC, DIo/RC), maximum quantum yield of non-photochemical deexcitation (ΦDo) of the dentate broad-ovate leaves were lower than the lanceolate leaves. The results showed that the dentate broad-ovate leaves had the more effective energy allocation strategy, so it was more tolerant to the extreme stressful environment. |
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| Keywords: | the fast chlorophyll fluorescence induction curves seasonal variation Populus euphraticar" target="_blank">Populus euphraticar')" href="#">Populus euphraticar lanceolate leaves broad-ovate leaves |
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