关键词: 八倍体小偃麦, 天蓝偃麦草, 细胞遗传学, 减数分裂

Abstract: The intergeneric hybrid was obtained for the first time among Maicao 8th, Maicao 9th, Form 2nd of Octoploid Trititrigia and Agropyron glaucum. The seed-setting rate of crossing generation reached 31.49%, 39.28% and 10.41% respectively. Interstitial type of parents was showed on F_1 hybrid, the plants were very big and flourish, its ear length ranged from 20 cm to 30 cm, the number of spikelet from 25 to 30. The hybrid could survived without coverage during the winter in Harbin, because it was perennial plants and could resist the cold. After scrutinizing the meiosis of pollen mother cells in F_1 hybrids, the results were concluded as follows: the chromosomes were paired unusually, with high rate of univalent and appearing multibivalent. At F_1 PMC MI, the chromosome configurations were 9.5Ⅰ+16.98Ⅱ+0.27Ⅲ, 13.6Ⅰ+14.01Ⅱ+0.87Ⅲ and 11.2Ⅰ+16.8Ⅱ+0.08Ⅲ, respectively. The variable range of bivalent was 13 to 18, univalent was 11 to 17, and multivalent was 0.08 to 0.087, most of bivalents were bar shaped. We could speculate that part of homologous chromosome were in relationship and the others were non-homologous genomes, there was also relationship in some chromosome among homologous. Ph gene in chromosome of 5B of wheat may be inhibited by the chromosome E.

Key words: octoploid trititrigia, Agropyron glaucum, cytogenetics, meiosis