两系杂交粳稻N5088S／R187的选配与应用初报

Breeding of the Two-line Japonica Hybrid Pice N5088S/R187

两系杂交粳稻Ｎ５０８８Ｓ／Ｒ１８７于１９８９年选育成功。该组合具有产量优势明显、抗病性强、熟期适宜、米质优和易脱粒等特点。１９９３年试种示范面积１万亩，平均亩产４５０ｋｇ左右，高产田块亩产达５９０ｋｇ，该组合繁殖制种产量高，符合商品化生产的要求，预计在长江中下游地区具有良好的应用前景。

N5088S/R187,a new two-line japonica hybrid rice,was developed in 1989. N5088S,thematernal parent, was bred from the cross of Nongken 58S (the MS gene donor) and Nonghu 26(a japonicalater maturing variety) in 1986, and it was certified technically by the Science and Technology Committee ofHubei Province in 1992. The paternal parent R187 was selected from a variant plant of the japonica variety Su512. In the Hubei Rice Variety Regional Trials in 1992 and 1993. the combination of N5088S/R187,yielded6.75 t/ha averagely, which was 5.75%more than that of ckeck Ⅰ Eyi 105(variety) and 3.85%more thanthat of ckeck Ⅱ Weiyou 64 (hybrid),and ranked the first in yield performance. The multiplying yleld ofN5088S was about 4.5t/ha, and the yield in its hybrid seed production was generally more than 2. 25 t/ha.The combination moderately resists blast and bacterial blight and threshes easily. Its grain quality meets thestandards of the 2nd class grain quality issued by the chinese Ministry of Agriculture. In 1994,it is expectedthat the combination will be planted to 3333.3 hectares with its seed production area of 333.3 hectares.