籼稻二元不育系9730A及三交种的初步研究

Study on Triple Hybrid and an Indica Second Cytoplasm-genetic Male Sterile Lines(CMS)9730A

通过对所选育的籼稻二元不育系9730A的花粉育性、自交结实率、雌性育性、对“920”的敏感性、柱头外露情况、花时、雄性不育的可恢复性及三交种的抽穗整齐度、有效穗、株高、单株产量、结实率、主茎穗长、主茎叶长、穗粒等变异度的分析,对杂交水稻三交法育种的应用价值进行初步探讨。结果认为:通过引进具有不同优良品种特性的第二保持系,可以在保持所选育杂种品种主要农艺性状整齐一致的前提下,较大幅度地拓宽品种的遗传基础,改进雄性不育系的异交性能,从而为提高杂种种子生产水平、及时利用优良常规稻育种成果材料和综合实现杂交稻品种选育过程中的多抗、广适、高产、优质育种目标提供新的途径。

The application value of three way cross for hybrid rice breeding was studied by using an indica second cytoplasm-genetic male sterile lines（C MS）9730A. It was based on the analysis of the pollen fertility, self bred rate, female fertility, sensitivity to GA3, out rate of chapiter, bloom time, restoration of male sterile of 9730A, and the variation analysis of heading, plant height, effective panicles, grain yield per plant, seed set rate, panicle length of main culm, flag leaf length of main culm, spikelets per panicle of three cross hybrid. The results indicated that through using the second maintainer of male sterile lines which had different good agronomy characters, the cuhivars derived from the traditional breeding methods could be made a good use of the hybrid rice breeding program, and the second CMS lines with better floral characteristics could be obtained. With the second CMS lines , we could improve the yield level of the hybrid seeds production, and combine the various good agronomy characters to hybrid rice cuhivars with keeping their main agronomy traits in the same time.