Study On Genetic Variation Of The Hybrid BC₁F₁ Between Elymus Dahuricus And Hordeum Brevisubulatum

The genetic variation of the Hybrid BC₁F₁ between Elymus dahuricus and Hordeum brevisubulatum were studied by means of morphology, biology,cytology and isozyme electrophoresis .The results were as follows:â‘ The morphological characteristics of hybrid F₁ between E. dahuricus and H. brevisubulatum tended toward parent E. dahuricus, the morphological characteristics of hybrid BC₁F₁ tended toward recurrent parent H. brevisubulatum and there were significant differences among backcross 1 (BC₁) lines.â‘¡The growing and developing period,growing dynamics,yield, tiller ability of the hybrid F₁ were in the middle of the parents, the morphological characteristics, growing days and regeneration were strong. The phenological period, yield,regeneration rate and tiller ability of E. dahuricus×H. brevisubulatum F₁ were stronger than H. brevisubulatum×E. dahuricus F₁. The hybrid F₁ was highly infertile.â‘¢The growth rhythm of BC₁ moved up at elongating stage.The growth dynamics between ( E. dahuricus×H. brevisubulatum )×H. brevisubulatum BC₁F₁ and (H. brevisubulatum×E. dahuricus )×H. brevisubulatum BC₁F₁ is basically consisitent,and majority tended toward recurrent parent H.brevisubulatum but slower than it.The fertilities of BC₁ were enhanced in different degree, There were significant differences among BC₁ lines in the biological and agronomic characters.â‘£The chromosome number of E. dahuricus×H. brevisubulatum F₁ and H. brevisubulatum×E. dahuricus F₁ was all 35. The BC₁ varied in chromosome number ranged from 28 to 33.⑤The zymogram of POD and EST of hybrid F₁ were the mutual suplementary isozymes of the parents or had hybrid bands,and there were phenomenon of losing bands. The zymogram of POD and EST of BC₁ were affected obviously by recurrent parent H. brevisubulatum.