水稻光温敏核不育系1161S的选育

Breeding of PTGMS Line 1161S in Rice

1161S是以培矮64S作母本与133S杂交,经4 a 8代的系谱选择和测交筛选育成的水稻光温敏核不育系,2006年2月通过湖南省农作物品种审定委员会审定。该不育系株叶形态好,群体不育性稳定,不育起点温度为23.5℃,开花集中,柱头外露率达87.8%。所配组合生育期适中,株叶形态好,米质较优,产量较高;其中两优1169(1161S/9311)、隆平602(1161S/蜀恢527)分别于2004和2006年通过江西省品种审定。

1161S, derived from the hybridization of two photoperiod- and thermo-sensitive genetic male sterile （PTGMS） lines, viz., Pei＇ai 64S （as the female） and 133S, and developed by way of pedigree selection and testcrosses through eight generations in four years, is a new PTGMS hne in rice. It has a good plant type and shows a stable male sterility in population with a low critical temperature at 23.5 %. It has a good flowering behavior with a high stigma exsertion rate （87.8 % ） and a relatively centralized daily blooming period. In February, 2006, it was certified by the Hunan Provincial Crop Variety Appraisal Committee. Most of the Fi hybrids derived from 1161S show good plant type, suitable maturity, high yield and good grain quality. Among them, Liangyou 1169 （1161S/9311） and Longping 602 （1161S/Shuhui 527） were registered and released by the Jiangxi Provincial Crop Variety Appraisal Committee in 2004 and 2006, respectively.