三种鹅观草的生物系统学研究  

A biosystematic study on Roegneria dolichathera, R. pendulina and R. kamoji

作　　者：周永红[1] 

机构地区：[1]四川农业大学小麦研究所,四川都江堰市611830

出　　处：《草业学报》2000年第2期45-52,共8页Acta Prataculturae Sinica

摘　　要：通过对鹅观草属犬草组长芒鹅观草、缘毛鹅观草和鹅观草 3个种及其种间杂种的形态变异、染色体配对行为和繁育特性进行研究 ,探讨这 3个种的亲缘关系。 F1植株的外形趋于两亲本之间。在减数分裂过程中 ,亲本种染色体配对正常。杂种 F1的染色体配对数较高 ,平均构型 :R.p enduli-na× R.dolichathera为 0 .56 +13.72 ;R.dolichathera× R.kamoji为 7.58 +13.58 +0 .0 4 +0 .0 4 ,杂种高度不育。结果表明 :1)这 3个种是独立的生物学种 ,拥有两组相似的基本染色体组 St Y。 2 ) R.dolichathera与 R.pendulina的亲缘关系较它们分别与 R.In order to investigate the biosystematic relationships among Roegneria dolichathera, R. pendulina and R. kamoji , the morphological characters and the aspects of interspecific hybridization, chromosome pairing and fertility of the three species and their F 1 hybrids were carefully examined in this study. It was concluded from observation results that 1) the three species are strictly independent, they are valid biological species sharing two basic St and Y genomes; 2) R. dolichathera is more closely related to R. pendulina than either of them to R. kamoji.

关 键 词：鹅观草 染色体配对 染色体组 形态比较 

分 类 号：S543.2[农业科学—作物学]