PRODUCTION AND CYTOGENETIC STUDY OF INTERGENERIC HYBRIDS BETWEEN Triticum aestivum AND Agropyron desertorum

摘要

Through embryo culture, intergeneric hybrids were produced between common wheat,Triticum aestivum cv. Chinese Spring （CS） （2n= 6x = 42, AABBDD） and crested wheatgrass,Agropyron desertorum （2n =4x =28, PPPP） for the first time. Their F₂ and BC₁ seeds havealso been successfully obtained by selfing and backcrossing with wheat in F₁ hybrids. Theseedlings of all F₁ hybrids tended to resemble their female parent, but they had more tillers,and their spike characteristics were between their parents. Average meiotic chromosomepairing at MI of F₁ hybrids was: 6.62Ⅰ+ 8.20RingⅡ+ 4.16RodⅡ+0.57Ⅲ+ 0.35Ⅳ+0.06Ⅴ+0.03Ⅵ. The successful experience of hybridization of common wheat with A. desertorum,the reason for the high level of chromosome pairing and self-fertility in the F₁ hybrids werediscussed. The F₂ and BC₁ seeds obtained in F₁ hybrids are of great importance to theory andpractice.