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.