水稻三系不育系赣香A的选育

Breeding of Rice Trilineage Sterile Line Ganxiang A

三系不育系赣香A是江西省农科院水稻所利用多个保持系亲本进行杂交和复交,育成了赣香B,再用金23A测交并连续回交转育的一个籼型不育系。经不同气候条件下的花粉镜检和套袋自交结实的调查,其典败99.12%,圆败0.55%,染败0.33%,无正常染色花粉粒,套袋自交结实率为0%,不育株率和不育度均达100%。赣香A开花习性较好,柱头外露率高（66%-78%）、繁殖制种产量高,可达3000-4500 kg/hm2;株高约76 cm,茎秆较粗、大穗大粒、配合力强;播始历期6477d,叶片12-13叶,感温性、早熟性遗传力强;对稻瘟病抗性好且较耐高温和低温,适应性广;后期落色好,不早衰。

Trilineage sterile line Ganxiang A is an indica sterile line, it is bred by Rice Research Institute, Jiangxi Academy of Agricultural Sciences through test cross and continuous backcross between Jin 23A and Ganxiang B which derived from the hybridization and compound - crossing among many maintenance lines. The investigations on Ganxiang A under different climate conditions show that the typical abortive rate of pollen is 99.12%, round abortive rate is 0.55%, strained abortive rate is 0.33%, there are no normal coloration pollens, the setting rate of selling in the bag is 0%, sterile plant rate and sterile degree all are 100%. Ganxiang A has good flowering habit, high exposed stigma rate （66% -78% ）, high seed yield （3000 -4500 kg/hm^2） in seed production, thick stem, large spike and grain, strong combining ability, strong inheritance in thermo- sensitivity and early maturing, strong resistance to rice blast, strong tolerance to high temperature and low temperature, wide adaptability, its plant has the height of about 76 cm and 12 -13 leaves, its duration from sowing to initial heading is 64 -77 days.