小黑麦减数分裂与群体整齐度,结实率的相互关系

在对10个不同类型小黑麦品种(系)花粉母细胞减数分裂分析的基础上,研究了减数分裂行为与群体整齐度(以杂株率表示)、结实率的相互关系,结果表明,小黑麦减数分裂行为异常现象较为普遍,出现频率为9.3%～59.0%;非主体Ⅱ价体花粉母细胞频率与杂株率、结实率分别呈极显著正相关和显著负相关,关系密切;不规则的非整倍体频率与杂株率、结实率无显著相关关系;杂株率与结实率之间呈显著负相关.因此,非主体Ⅱ价体频率可以作为检验品种优劣的一项重要指标,在育种实践中,对结实率这项农艺性状的选择,具有关键作用.

The Relationship Between the Meiosis of Pollen Mother Cell and Uniformity and Fruit-bearing Percentage of Triticale Population

On the base of analysis to the meiosis of pollen mother cell for ten different strains of triticale, the relationships between meiosis behaviour and uniformity of the population (represented by confounding rate) and / or the fruit-bearing percentage were studied. Results showed that the behaviour abnormality of the triticale meiosis appeared quite often and the frequeucy lay between 9.3%-59.0%.There existed higher significant positive correlatian between the non-staple bivalent pollen mother cell frcpuency and the confounding rate, but significant negative correlation between the former and the fruit-bearing percentage. There was no significant correlation between the irregular ancuploid frequency and the confounding rate and / or the fruit-bearing percentage; but significant negative correlation bctwwen confounding rate and fruit-bearing percentage. Therefore, the non-staple bivalent frequency may be an important criterion for evaluating the hybrid strains, which is of the key significance in breeding practice for such agronomic character as fruit-bearing rate.