Analysis on Growth, Development and Cytology of Hybrid F_1 between (Elymus) canadensis and E. excelsus
YU Zhuo, WANG Xiao-juan, LIU Jie, MA Yan-hong(Agronomy College, Inner Mongolia Agricultural University,Hohhot 010019, China)
In order to investigate the fertility, cytogenetic basis and breeding potential for selecting and utilizing interspecific hybrid between (Elymus) canadensis and E. excelsus, the growth, fertility, cytogenetic characters etc. were analyzed with the methods of measuring fixed plants, staining pollen and (checking) chromosome slide etc. The results showed that the growth potentiality of hybrid F_1 was much stronger, hybrid F_1 was superior to its parents in growth rate and average plant height obviously, the plant type of F_1 tended to maternal parent (Elymus) canadensis, the ear was longer, ear type was in the middle of parents, the leaves were broader and (larger), the pollen fterility rate and seedset rate was 0; the hybrid F_1 is pentaploid (2n=5x=35), the average chromosome pairing configurations at metaphaseⅠin pollen mother cells is 5.79I+14.31Ⅱ+0.17Ⅲ, and there were bridge fragment and lagging chromosome at anaphaseⅠ, the chromosome irregular (behavior) of the pollen mother cell at meiosis was the main cause to result in hybrid F_1 infertility.