【摘要】 本文研究了禾本科小麦族鹅观草属的3个种:缘毛鹅观草（Roegneria pendulina Neuski 2n=4x=28）,纤毛鹅观草（R. ciliaris （Trin.） Nevski 2n=4x=28）和鹅观草（R. kamoji Ohwi 2n=6x=42）及其种间杂种的形态变异和染色体配对行为。各杂种F₁的减数分裂染色体配对数较高,但杂种高度不育。在杂种减数分裂中还观察到一定频率的多价体形成。以上结果充分表明该3种植物享有两个共同的基本染色体组,在S和Y染色体组之间发生过染色体相互易位,缘毛鹅观草的染色体组可拟定为S^PY^P。更多还原

【Abstract】 Morphological and cytological studies of three Roegneria species and theirartificial hybrids were carried out on R. pendulina Nevski (2n= 4x = 28) , R. ciliaris(Trin. ) Nevski (2n= 4x =28) and R. kamoji Ohwi (2n= 6 x = 42) . The F1 hybrids showed a comparatively high chromosome pairing in meiosis, but were almost completely sterile. A few amount of multivalents were also observed in the hybrids. These results indicate that the three independent species share two same basic genomes and they are very closely related. Reciprocal translocations probably occurred between the chromosomes of S and Y genomes. The genomes of R. pendulina could be designated as SpYn.更多还原