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鹅观草与大鹅观草杂种的细胞遗传学及形态学研究
张新全; 杨俊良; 颜济; 郑有良; 伍碧华;   
1.四川农业大学草业科学系!四川雅安625014;2.四川农业大学小麦研究所!四川都江堰611830
摘要:
大鹅观草( Roegneria grandis Keng) 是分布于我国陕西的一种多年生四倍体植物。为了探索大鹅观草与鹅观草( Roegneria kamoji Ohwi) 间的物种生物学关系, 通过对其进行远缘杂交,幼胚离体培养, 合成了远缘杂种; 并对亲本及杂种F1 代花粉母细胞减数分裂中期Ⅰ染色体配对行为及形态学进行了研究。结果表明杂种F1 减数分裂染色体配对平均构型为: R- kamoji ×R-grandis10-26 Ⅰ+ 12-37 Ⅱ(c- 值= 0-74) , 大鹅观草与鹅观草所含的SY 染色体组间存在较大的同源性分化; 杂种穗部特征大多数介于双亲之间。
关键词:  大鹅观草  鹅观草  种间杂种  减数分裂  形态学  
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