优质杂交晚稻新组合龙优268的选育与应用

目的]介绍优质杂交晚稻新组合龙优268。方法]综述龙优268的选育过程、产量情况、主要特征特性、栽培技术要点和制种技术要点。结果]龙优268是由不育系龙A与恢复系R268选配而成的三系杂交水稻新组合,2007年4月通过广西区农作物品种审定(桂审稻2007035号)。该组合株型适中,平均全生育期115 d,穗大粒多,丰产性好,稻米品质符合部颁食用籼稻品种品质3级标准,苗叶瘟6~7级,穗瘟发病率9级,穗瘟损失率9级,稻瘟病抗性指数8.3~8.5,白叶枯病IV型5级,V型9级,2006年参加生产试验平均产量达7 620kg/hm2,比博优253增产2.5%。结论]龙优268适宜在广西桂南稻作区和桂中稻作区南部种植博优桂99的地区作晚稻种植。

Breeding and Application of New Late Hybrid Rice Combination Longyou 268 with High Quality

Objective] The objective of the study was to introduce the new late hybrid rice combination Longyou 268 with high quality.Method] The breeding process,yield performance,main characteristics,key points of cultivation and seed production techniques of Longyou 268 were summarized.Result] Longyou 268 was a new three-line hybrid rice combination with Long A as sterile line and R268 as restorer line and has been approved officially by Guangxi Region Crop Variety Authorization Committee in April 2007(Guishendao No.2007035).The plant type of this combination was moderate with average whole growth period of 115 d.It had a good productivity with big spike and many grains,and its quality was suitable to 3 grade of quality standard of edible hsien varieties proclaimed by the Ministry of Agriculture.Its leaf blast was 6-7 grade and its disease incidence of panicle blast was 9 grade,while its loss rate of panicle blast was 9 grade.Its resistance index of panicle blast was 8.3-8.5 grade,and that of bacterial blight IV,V type was 5 and 9 grade resp.Its average yield in production test in 2006 was 7 620 kg/hm2,increasing by 2.5% than that of Boyou 253.Conclusion] Longyou 268 was suitable to be planted as late-season rice in the southern of Guinan and Guizhong rice regions in Guangxi where Boyougui 99 was planted.