Karyotype Analysis of the Parents and Progeny from the Wide Cross T. timopheevii×Avena Fatua L. Var. Portugal

The karyotype of stable TP2 line from the wide cross T.timopheevii×Avena Fatua L.Var.Portugal was analyzed in order to understand its characteristics in the present study.The results showed that the number of female parent's chromosomes was 28,belonged to type 2A;male parent and the TP2 line's chromosomes were 42,belonged to type 2B;chromosome relative length was in the range of 2.59-7.19,chromosome length ratio was 2.78,and arm ratio ranged from 1.00 to 2.11.Medium point(M),metacentric(m) and submetacentric(sm) chromosomes were included in the TP2 line.Two pairs of satellites were found on the chromosomes 6 and 17,respectively.Its karyotype formula was 2n=6x=42=6M+24m(2SAT)+12sm(2SAT).Four pairs of chromosomes,which were consistent with those in Avena Fatua L.Var.Portugal,but absent in T.timopheevii existed in the TP2 line.