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植物学报  2013 

国外甜瓜种质资源形态性状遗传多样性分析

DOI: 10.3724/SP.J.1259.2013.00042, PP. 42-51

Keywords: 聚类分析,国外甜瓜种质,遗传多样性,形态性状

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Abstract:

?对250份国外甜瓜(Cucumismelo)种质资源的19个形态性状多样性进行研究。结果表明,国外甜瓜种质资源具有丰富的形态多样性,平均遗传多样性指数为1.378。9个质量性状(果实形状、果皮底色、覆纹颜色、覆纹形状、网纹密度、网纹粗度、果肉颜色、果肉质地和种子颜色)和4个数量性状(单果鲜重、果肉厚度、可溶性固形物含量和种子千粒重)变异明显,其Shannon’s指数分别大于1.0和1.9。不同生态区间种质资源遗传多样性差异明显,多样性指数由高到低依次为:南亚(1.512)、东北欧(1.404)、西欧(1.372)、北美(1.340)和东亚(1.281)。通过聚类分析将所有甜瓜种质划分为四大组群,即南亚组群、东北欧组群、西欧北美组群和东亚北美组群。以印度为代表的南亚甜瓜种质形态多样性水平较高,支持了印度次生大陆为甜瓜起源中心的观点。

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