论文部分内容阅读
利用3个籼稻温敏核雄性不育系与9个热带粳稻基因渗入恢复系组配27个杂交稻组合,对杂种优势和产量构成主要因素与亲本间的SSR和SSR RAPD分子遗传距离的关系进行偏相关分析,筛选强优势杂交稻组合。研究结果表明,在籼稻与热带粳稻渗入系的杂种后代中,多数组合的每穗实粒数、总粒数和穗长呈现正竞争优势;杂种比对照的产量竞争优势主要是依靠每穗结实粒数的增加。在产量构成要素中,每穗实粒数与亲本间的SSR和SSR RAPD分子遗传距离显著相关,而有效穗数和千粒重与之不显著相关,表明在籼稻与热带粳稻渗入系间的杂交稻组合中可以通过增加亲本间的遗传距离增加杂种的每穗粒数,提高杂种的产量优势。通过分子标记辅助选择获得的“桂118S×T511”和“T1S×R138”两个杂交水稻组合示范产量分别比对照特优63增16 3%和6 7%,其亲本间的SSR遗传距离分别为0 83和0 71,亲本间分子多态性分别达到51 4%和42 8%,表明适当应用分子标记辅助选择有助于选育强优势杂交水稻组合。
Using 27 indica thermo-sensitive genic male sterile lines and 9 tropical japonica introgression restorer lines, 27 hybrid rice combinations were used to study the relationship between the main factors of heterosis and yield components and the SSR and SSR RAPD genetic distance between parents Partial correlation analysis, screening strong hybrid rice combinations. The results showed that among the hybrid progenies of indica rice and tropical japonica rice introgression lines, the number of grains per panicle, the total number of grains per panicle and the spike length of most combinations showed a positive competitive advantage. The yield competitive advantages of hybrids were mainly depend on the grains per panicle Increase in number. Among the components of yield components, the number of grain per panicle was significantly related to the genetic distance of SSR and SSR RAPD between parents, but the effective panicle number and 1000-grain weight were not significantly correlated with each other, indicating that the hybrid rice combination between indica and tropical japonica rice Can increase the grain-per-spike number of hybrids by increasing the genetic distance between parents and improve the heterosis yield. The yield of two combinations of “Gui 118S × T511” and “T1S × R138” obtained by molecular marker-assisted selection increased by 16.3% and 67% respectively compared with that of the control. The SSR The genetic distances were 0 83 and 0 71, respectively. The molecular polymorphisms among the parents reached 51 4% and 42 8% respectively, indicating that proper selection of molecular marker-assisted selection could help to breed strong heterosis rice combinations.