摘要： 首次完成了中国北部普通小麦第五部分同源群单体单价体错分裂方式的研究。结果发现在全部包括九个品种三条染色体的27个组合中，共发现了37个“取向模式”类型。根据这37个“取向模式”类型，可以把错分裂方式分为四个类型。1、一次包括一条染色单体的错分裂。2、一次包括两条染色单体的错分裂。3、二次包括两条染色单体的错分裂。4、三次包括两条染色单体的错分裂。它们之间的比例是65：13：5：1。

关键词: 普通小麦, 单体单价体, 错分裂方式

Abstract: At the first time,the study of misdivision pattern of homoeologous group 5monosomic univerlants from North Chinese common wheat(T.aestivum)was conducted.The results indicated that there were 37 orietation patterns in 27cobinations including nine cultivars and three chromosomes.According to analysis of 37 orientation patterns,four misdivision patterns were discovered.They were as follows:1.One-time misdivision event including one chromotid.2.One-time misdivision event including two chromotids.3.Two-time misdivision event including two chromotids.4.Three-time misdivision event including two chromotids.Their rotio was 65:13:5:1.

Key words: Common wheat, Monosomic univalent, Misdivision pattern