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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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樱属植物核型参数及种间亲缘关系分析
DOI: 10.3969/j.issn.1000-2006.2014.S1.006, PP. 25-29
Keywords: 樱属,核型参数,聚类分析,亲缘关系
Abstract:
统计了18份樱属植物的核型数据,借助dps软件用最大距离法进行聚类分析,探讨了属内系统结构和种间亲缘关系。结果表明:樱属染色体基数x=8,染色体数目有2n=16、2n=24以及2n=32;染色体类型有4种,正中部着丝点染色体(m),中部着丝点染色体(m),近中部着丝点染色体(sm),近端部着丝点染色体(st);随体常见,核型类型有2a、2b、1b3种;野生类群多为二倍体,栽培品种多倍化现象显著;大叶早樱(cerasussubhirtella)、‘十月樱’(c.subhirtella‘autumnalis’)、东京樱花(c.yedoensis)、山樱花(c.serrulata)聚为一类,支持黑果组(c.sect.sargentella)成立;二倍体酸樱桃(c.vulgaris)、甜樱桃(c.avium)聚为一类,支持芽鳞组(c.sect.cerasus)成立;虽然红山樱(c.jamasakura)与山樱花表型相似,但聚类结果显示二者遗传距离较远,前者与钟花樱(c.campanulata)遗传距离较近;本属栽培种类多倍化程度高于野生种类且有多个倍性,与其二倍体祖先表现出较远的遗传距离;聚类分析难以解释栽培种的起源。与传统的经典分类结果不同,矮生樱亚属(c.subg.microcerasus)与典型樱亚属(c.subg.cerasus)在聚类图上没有明显地分开。
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