水稻不育系紫A的开花习性及异交结实性

为了掌握新选水稻三系不育系紫A的异交特性,对其开花习性及异交结实性进行了初步研究.结果表明:花时集中在9:30-16:00,11:30时达到开花高峰期,午前开花率占68.2%;颖花张颖角度变幅为20°～29.4°,开闭颖历时9.5 h;单穗开花高峰期为始花后的3～6 d;柱头较大且在施用九二〇情况下外露率高达79.88%,人工辅助授粉的情况下,紫A的异交结实率为73.69%,自然授粉的异交结实率仅为59.65%,变化幅度大且异交结实率受外界环境影响较大.

Flowering Habit and Out-cross Characteristics of Purple A, a Rice Male Sterile Line

In order to hold out-crossing characteristics of Purple A, a new rice male sterile line, The results from studying the flowering habit and out-cross characteristics of it, showed that its flowering time was from 9:30 Am to 16:00 Pm, the flowering peak was at 11:30, the forenoon flowering rate was 68.2%, the glume open angle varied from 20° to 29.4°, the glume opening and closing period lasted 9.5 h, the flowering peak period of single spike was 3～6 d after its first flowering, the stigma exsertion rate was up to 79.88% under applying Gibberellin (GA_3), the out-crossing setting rate was 73.69% under artificial supplementary pollination, the out-crossing setting rate was only 59.65% under natural pollination and its change range and out-crossing setting rate were affected by environmental factors.