杂交水稻制种不育系穗上发芽特性

Characteristics of Pre-harvest Sprouting in Sterile Lines in Hybrid Rice Seeds Production

在杂交水稻制繁种生产中 ,经常发生穗发芽现象。本试验对以培矮 6 4 S、协青早 A、珍汕 97A、K17A等 7个不育系为母本 ,以中 930 8、明恢 6 3、中 2 0 70等 17个恢复系为父本 ,对杂交种子进行田间穗上发芽的测定、新收种子室内发芽试验及种子α-淀粉酶活性测定。结果表明 :不同杂交种子穗上发芽率和穗发芽指数具有显著差异 ;平均穗上发芽率和穗发芽指数较低的亲本 ,其 F1 代穗上发芽率和穗发芽指数的变异幅度明显比平均穗上发芽率和穗发芽指数较高的亲本要小 ;穗上发芽率和穗发芽指数与新收种子室内发芽率、发芽指数以及种子α-淀粉酶活性之间不存在相关性。

The phenomenon of pre harvest sprouting usually occurs in the production of F 1 and male sterile line seeds of hybrid rice. Percentage of pre harvest sprouting, laboratory germination of newly harvested seeds and α amylase activities of F 1 were investigated, hybridized grown seven sterile lines, PeiAi 64S, XieQingZao A, ZhenShan 97A, K17A, etc. with seventeen restorer lines, Zhong 9308, MingHui 63, Zhong 2070, etc. The results showed that significant differences in percentage and index of F 1 pre harvest sprouting were found among different hybrid combinations. Variation extent of percentage and index of grains sprouting of F 1 from the parents that had lower average percentage and lower index of pre harvest sprouting was smaller than that from the parents that had higher average percentage and higher index of pre harvest sprouting. No significant correlations were observed between the percentage or index of pre harvest sprouting and laboratory germination percentage or germination index or α amylase activity of newly harvested seeds.