The Cytogenetical Studies of Male Sterile Line of Nian Type in Wheat

Hybridized wheat male sterile lines of identical nucleus 4 alien cytoplasms(Ae.kotschyi,Ae.variabilis,Ae.ventricoca,Ae.bicornis) and alien nuclei (224, 90-110) with a series of wheat varieties on produce.The chromosome mating behavior of F_1 at MI and AI was systematically investigated,and the relationship of the frequency of cells with abnormal chromosome at MI and AI and F_1 selfed seed set was analyzed.The results were as follows:①The F_1 selfed seed set of hybrids was negatively correlated to the frequency of cells with abnormal chromosome at MI and AI,but it is not prominent. The frequency of cells with univalent at MI was positively correlated to the frequency of cells with abnormal chromosome at AI, and it is significant. ②The effect of alien cytoplasms on chromosome mating is different because of the different genetic determinant of male parent. ③The fertility of hybrids F_1 concerns not only chromosome mating but also gene type and environment.