陆地棉新型核雄性不育系21A的初步研究

Studies of New Genic Male Sterility Cotton Named "21A" in Upland Cotton(Gossypium hirsutum L.)

利用辐射诱变和回交育种成功培育出21A雄性不育系,经遗传分析和等位性测验发现,该不育性受1对隐性基因控制,它与国内发现的msc1、msc2、msc3、msc74个陆地棉隐性不育基因彼此是非等位基因;采用NCⅡ遗传交配设计,用21A不育系作母本,5个常规棉品种作父本,配制杂交组合,对10个组合的F1产量和品质性状的竞争优势和配合力进行分析,结果表明,该不育系杂种优势明显,一般配合力高,易于筛选优良的杂交组合,在生产优质杂交种方面具有很大的利用价值。

Utilization of male sterility in heterosis has a good developmental prospect.In this study,the male sterility of 21A has been observed successfully by induced mutation breeding and back cross breeding.Genetic and allelic tests for 21A male-sterile line were made and the results showed that the male sterility in 21A was controlled by a pair of single-recessive gene and its male-sterility was in none-allelic to msc1,msc2,msc3 and msc7 discovered in P.R.China.Crosses were made by NCⅡ,using 21A male sterility line as female parent and five normal cultivars as male parent,to analyze competitive heterosis and combining ability of F1 hybrids.The results indicated that 21A male sterile line showed obvious heterosis and general combining ability（GCA）.It is easy to observe better cross combinations and product hybrid seeds using 21A male sterile line.