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不同施氮量烤烟氮素代谢差异及其对香气前体物形成的影响

DOI: 10.7668/hbnxb.2014.01.031, PP. 170-177

Keywords: 烤烟,氮代谢,类胡萝卜素,多酚

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Abstract:

为了探索烤烟品种氮素代谢差异对烟叶香气前体物形成的影响,运用大田施肥试验,测定了不同施氮水平下豫烟10号和中烟203成熟过程中的氮素代谢产物和相关酶活性的变化,同时测定了类胡萝卜素和多酚含量。结果表明,品种间GS、GDH等氮素代谢相关酶活性不同决定了氮素转化方式和转移规律,是导致基因型间氮素代谢差异的重要因素。类胡萝卜素和多酚含量与氮代谢产物和相关酶活性的相关性分析:在生长成熟前期类胡萝卜素含量与GS的相关系数达0.515*,在成熟后期与GS、GDH的相关系数分别达0.664**和0.645**;在整个成熟期多酚含量与NR的相关系数达到-0.524**。品种间比较说明烤烟成熟前期氮代谢旺盛有利于类胡萝卜素的形成,成熟后期氮代谢强度减弱有利于类胡萝卜素降解产物的形成;烤烟成熟期NR活性低,硝酸盐积累则多酚的形成受到抑制。

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