Abstract: Abstract The meiotic configurations at metaphasc I show often one chain or ring quadrivalent in hybrids between CV. Fengkang No. 13 and Beijing Red No. 1 , this indicates that the two chromosomes are involved in one reciprocal translocation. 21 monosomic plants of Beijing Red No. 1 were used as female parents in crosses with Fengkang No. 13. All monosomic families F1 PMCs at metaphase I were observed to analyze the chromosomal configuration. The meiotic behaviour of monosomic offspring shows different chromosome configurations depen-ding on whether the monosomic chromosome is or is not involved in a translocation. Configurations at metaphase I of monosomic 4B and 1D in F1PMCs exhibit 19 bivalcnts and 1 trivalent, without any univalent. Configurations at metaphase I of monosomic families F1 except mono-4B and 1D exhibit 18 bivalcnts, 1 Quadriva-lent and 1 univalent. The results obtained indicate clearly that the two chromoso-mes involved in this reciprocal translocation are 4B and 1D.

Key words: Common Wheat

摘要： 通过细胞学观察，在普通小麦栽培品种“丰抗13”和“京红1号”的杂交后代中，发现有多价体出现，这就表明有染色体易位发生。为进一步弄清究竟是哪条染色体发生了易位，我们采用单体测交方法，观察鉴定所有各单体系F1的花粉母细胞第一次减数分裂中期I(以下简称PMCs中I)染色体构型。从鉴定结果发现，凡2n＝42的F1PMCs中I出现19II＋1Ⅳ,而2n＝41的FlPMCs中I的染色体构型不同，单体与易位有关的两个单体系4B和1DFlPMCs中的I构型中有部分呈现为19个二价体加l个三价体，即19II十lII，没有单价体，而其余各单体系FlPMCs中I构型则表现为18个二价体，1个四价体和1个单价体，即18II＋1Ⅳ+1I。因此，可以肯定。“丰抗13”存在1个染色体易位，其有关染色体就是4B和1D

关键词: 普通小麦, 染色体构型, 染色体易位