徐呈祥;徐锡增;

• 1:肇庆学院生命科学学院
• 2:南京林业大学森林资源与环境学院
• 3:金陵科技学院园艺学院

摘要(Abstract)：

为进一步揭示硅(Si)与金丝小枣(Ziziphus jujuba Mill.cv.Jinsixiaozao)耐盐性的关系,以金丝小枣品种2a生嫁接苗为试材,研究了NaCl胁迫下Si对其叶片中矿质元素相对含量的影响。X-射线能谱分析结果表明,与对照相比,盐胁迫下金丝小枣叶片各个组织的细胞中K、Na元素相对含量均显著升高,Cl元素相对含量小幅升高,Si、Ca、Mg元素相对含量在大多数组织的细胞中显著下降;K、Ca、Si元素与Na、Cl元素相对含量间的比值明显改变,其中K/Na在栅栏组织的细胞中显著下降,Ca/Na和Si/Na几乎在所有组织的细胞中均显著下降。与盐胁迫相比,盐胁迫下加Si,枣叶片大多数组织的细胞中Ca元素相对含量升高不明显,P元素相对含量变化很小,Mg元素相对含量持续降低,但Na、Cl、K、Si元素相对含量在枣叶细胞中均显著变化,其中在叶绿体主要分布的栅栏细胞中K元素相对含量升高的幅度与Na、Cl元素相对含量降低的幅度均超过28.0%,Si元素相对含量在除下表皮细胞以外的所有叶细胞中均成倍升高,同时,这几种元素相对含量间的比值也显著改变,尤以K/Na、Si/Na和Si/Cl显著增大最为突出。结果说明,Si影响盐胁迫下金丝小枣对矿质元素的选择性吸收与分配,改善盐胁迫下金丝小枣叶片中盐分离子的平衡及微域分布。

关键词(KeyWords)： 金丝小枣;NaCl胁迫;Si;微域分布;X-射线能谱

Abstract:

Keywords:

基金项目(Foundation): 江苏省教育厅自然科学研究计划(KJD06210063);; 江苏省博士后科研计划(0701039B);; 中国博士后科学基金(20070411057)

作者(Author): 徐呈祥;徐锡增;

Email:

DOI: 10.13925/j.cnki.gsxb.2010.03.004

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