粳稻材料空间诱变的研究

Study on Space Mutagenesis of Japonica Rice Material

【目的】利用空间诱变技术培育水稻新品种。【方法】2006年9月通过(实践八号)育种卫星搭载三个水稻品种干种子,经空间诱变处理后将种子在地面种植,考察了后代的遗传及变异情况。【结果】SP1代与对照差异不显著。SP2代群体的单株间主要农艺、经济性状出现了强烈的后代分离,变异频率高达4.09%。SP3代部分株系开始稳定。SP4代已经进入稳定状态,筛选出的突变株系最高增产幅度达到29.8%,抗病性明显提高。【结论】水稻干种子在空间条件下所产生的变异频率高,变异幅度大,并能够稳定的遗传于后代,有望选育出水稻新种质资源。

[Objective and Method]The study was conducted to reveal that the three dry seed varieties of rice were taken by breeding satellite in Sep. 2006 to be bred by mutagenesis , which were planted in the soil after space mutagenesis, then were tested by inheritance to observe the variation of later generations. [ Result ] The results showed that： the difference between SP1 and contrast was not remarkable; the characters of agronomy and economy between SP2 group appeared strong later generation difference; variation frequency was 4.09 % . The characters of SP3 and SP2 were similar to each other. SP4 was in the stable stage. The highest production increasing range of selected mutational plants reached 29.8%, and the disease resistance was improved significantly. [ Conclusion] It was proved by practice： the dry seeds of rice had high variation frequency, wide variation range and were able to inherit the variation to the later generations under the space condition and it was hoped to breed new seed resources.