Studies on inducing parthenogenesis of some male sterile lines of alloplasmic 1BL/1RS wheat

The performance,the chromosome pairing and the parthenogenesis of the cross and backcross generations of 4 male sterile types of alloplasmic 1BL/1RS wheat with Ae.ventricosa,Ae.kotschyi,Ae.variabilis and Ae.bicornis cytoplasms and their identical nucleus background lines with different cytoplasms,the different nuclei background lines with same cytoplasms and the heterokaryon lines with alloplasm were systematically investigated.The results were as follows:(1) The homologous chromosome pairing in PMC at MI was reduced and the frequency of cell with univalent in male sterile lines was raised under special interaction of 1BL/1RS nuclei and different alien cytoplasmic.(2) Under special cytoplasmic background,it was directly ralated for the frequency of cell with univalent in special karyotype,higher or lower,and the frequency of inducing parthenogenesis.(3) It was obviously different that there were seriesy difference in the translocation segment of 1BL/1RS chromosome and in the genotype background besides 1BL/1RS translocation chromosome for parthenogenesis.(4) There were identical important role for the sterile lines and the different male parents of genotype in the parthenogenesis of different intergenerations,raised or reduced,of the cross and backcross.The frequency of parthenogenesis in progeny populations could be obviously raised or reduced electing suitable combinations of female and male parents.