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草业学报  2009 

拟鹅观草属与鹅观草属和披碱草属属间及种间杂种的细胞学研究

, PP. 86-93

Keywords: 种间杂交,属间杂交,染色体组分化,减数分裂,染色体配对

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Abstract:

为探讨在二倍体拟鹅观草属物种中St基因组的分化及其系统关系,本试验通过对3个二倍体拟鹅观草的种间杂种及黎巴嫩拟鹅观草和托瑞拟鹅观草与4个四倍体鹅观草属物种(StY)和3个披碱草属(StH,StYW)物种的属间杂种F1花粉母细胞减数分裂中期I染色体配对行为及繁育特性进行分析。结果表明,1)中东的拟鹅观草二倍体物种(黎巴嫩拟鹅观草和托瑞拟鹅观草)中St染色体组与来自北美的物种(穗状拟鹅观草)可能存在差异;2)St染色体组在鹅观草属物种中(StY)和在披碱草属物种中(StH,StYW)均存在一定程度的变异,具有一定程度的分化;3)St染色体组与Y染色体组具有一定程度的同源性,亲缘关系较近,而与H染色体组的关系较远。

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