Study On Agronomic Characters And Cytogenetics Of The Hybrid BC₁F₃ Between Elymus Dahuricus And Hordeum Brevisubulatum

The genetic variation of the hybrid BC₁F₃ between Elymus dahuricus and Hordeum brevisubulatum were studied by means of biology, cytology and isozyme electrophoresis. The results were as follows:â‘ The growing period, growth rate and regeneration of the hybrid BC₁F₃ tended toward recurrent parent H. brevisubulatum.â‘¡The fertilities of BC₁F₃ were recovered and enhanced in different degree.The rates of fertile pollen in YF₃-64 and YF₃-93 were 92.79% and 93.91% respectively, the natural seed setting rates under open pollination were 37.52% and 56.70% respectively.â‘¢Fourteen lines of BC₁F₃ generation were significantly different in grass output, e.g. YF₃-64,YF₃-74,YF₃-75,YF₃-83 showed higher grass outputs than parents,whose HPs were respectively 75.53%, 75.12%,65.27%and 66.16%, showing a remarkable heterosis; some others like PF₃-15, PF₃-52, YF₃-31 and YF₃-42 performed poorer in output than parents,their grass outputs were respectively 351.2,226.0, 371.9 and 341.6 g/clump.â‘£The drought resistance of the hybrid BC₁F₃ were in the middle of the parents. After comprehensive evaluation the order of drought resistance ability of 16 tested materials was :Elymus dahuricus > YF₃-23> YF₃-43> YF₃-44 =YF₃-53 >YF₃-64=YF₃-85> PF₃-52= YF₃-31> YF₃-93> YF₃-83> YF₃-75>YF₃-42> PF₃-15> YF₃-74> H. brevisubulatum.⑤The chromosome number of somatic cell in the hybrid BC₁F₃ was all 28,the same as recurrent parent H. brevisubulatu.â‘¥The zymogram of POD and EST of hybrid BC₁F₃ were the mutual suplementary isozymes of the parents and there were phenomenon of losing bands, some lines had hybrid bands in the zymogram of EST.The zymogram of BC₁F₃ were affected obviously by recurrent parent H. brevisubulatum.⑦YF₃-64, YF₃-74 and YF₃-83 had high heterosis, for the development of animal husbandry areas, YF₃-23, YF₃-43 and YF₃-44 has strong drought resistance can be used to improve the environment and developed artificial pasture . YF₃-64 had good performance both the yield and drought resistance, can be a new improved strain with high yield and better resistive to promote.