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OALib Journal期刊
ISSN: 2333-9721
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紫丁香叶片发育过程中花色素苷含量与叶绿素荧光和激发能分配的关系
DOI: 10.3969/j.issn.1000-2006.2014.01.011, PP. 59-64
Keywords: 紫丁香,花色素苷,叶绿素荧光,激发能
Abstract:
以紫丁香(syringaoblatalindl.)为试验材料,研究了叶片展开过程中花色素苷含量变化对叶绿素含量、叶绿素荧光特性和光合激发能分配的影响。结果表明:紫丁香叶片从幼叶伸出到叶片成熟的各生育阶段,花色素苷含量降低,而叶绿素含量增加,二者之间呈明显的负相关,叶片对光能的捕获和利用能力也随着花色素苷的降低而增强,但是,从叶片伸出到叶片展开,叶片最大光化学效率(fv/fm)没有明显变化。在紫丁香叶片伸出到扩展的进程中,花色素苷含量降低,psⅱ反应中心吸收的光能分配到失活psⅱ反应中心的热耗散量子产额(фnf)下降,以及依赖于叶黄素循环的量子产额(фnpq)下降。说明叶片叶龄越小,花色素苷含量越多,依赖于类囊体膜两侧质子梯度和叶黄素循环耗散的能量比例明显高于成熟叶片,而且psⅱ反应中心吸收光能分配到无活性反应中心的比例较大,这种光能的分配机制明显降低了幼叶中有活性psⅱ反应中心的压力,因此,花色素苷可防止幼叶光合机制受到过剩光能的破坏。
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