中籼2503的选育及其应用研究

中籼2503系安徽省农业科学院水稻研究所采用复合杂交和系谱选择法育成的优质中籼稻新品种,具有米质优异、产量较高、抗逆性较强、熟期适中和综合性状好的特点。米质达部颁一等食用稻品质标准;两年省区试,平均产量8 380.5 kg/hm2,较对照汕优63增产1.01%,一年省生产试验,平均产量8 418.0 kg/hm2,较对照汕优63增产8.29%;白叶枯抗性3~5级,稻瘟病抗性5~7级,抗性明显优于对照汕优63,抗倒性好。全生育期135~140 d,适宜在安徽省作一季中稻种植。适宜播期为4月下旬至5月上旬,基本苗100万~120万/hm2。

Study on the Breeding of Zhongxian 2503 and Its Application

A new medium indica hybrid rice variety with good quality,Zhongxian 2503 was bred by using composite cross and pedigree selection method by Rice Institute of Anhui Academy of Agricultural Sciences.It had the characteristics of excellent grain quality,higher yield,stronger stress-resistance,moderate maturation period and good comprehensive properties.Its grain quality reached the standards of the first-class edible rice issued by Ministry of Agriculture of China.In two-year provincial regional test,its average yield was 8 380.5 kg/hm2,which increased by 1.01% than that of Shanyou 63(CK).In one-year provincial production test,its average yield was 8 418.0 kg/hm2,which increased by 8.29% than that of Shanyou 63.It had resistance to Xanthomonas oryzae at the 3rd～5th grade and resistance to rice blast at the 5th～7th grade.Its resistance was obviously better than that of Shanyou 63(CK) and it had good lodging resistance.It had the whole growth period of 135～140 d and was suitable to be planted as one season medium rice in Anhui province.The suitable sowing date was from late April to early May and the basic seedling number was 1 000～1 200 thousand per hm2.