采用病区和高海拔双重加压选择法选育水稻低温敏核不育系福龙S2

Breeding of low-temperature sensitive genic male sterile Fulong S2 by means of blast resistance and high-altitude ecological pressure selection

以开花习性良好、早熟、临界温度低的田丰S-2作不育基因供体,与株叶形态好、迟熟、品质优、抗稻瘟病、耐寒性好、后期转色好,但开花习性较差的基本营养型中籼材料龙优2号杂交,采用病区抗性选择法+生态压力选择法+南北穿梭加代的育种方法,选育出两用核不育系福龙S2,于2006年11月通过福建省技术成果鉴定。该核不育系具有不育起点温度低(≤23.5℃)、不育性稳定、不育期长(>104 d)、基本营养型、熟期适中、中抗稻瘟病、配合力好、异交结实率高、可繁性好等特点。用福龙S2配组的杂交稻新组合表现出生育期适中、产量高、中抗稻瘟病、品质优等特点,具有较广阔的应用前景。

The newly bred Fulong S2,a low-temperature sensitive genic male sterile line rice,was developed by crossing Tianfeng S2 with Longyou-2 and by combined selection of blast resistance in blast area,eco-stress for stable sterility and shuttle breeding.Tianfeng S2（used as TGMS gene donor） has characteristics of early mature,good flowering and low-temperature sensitive genic male sterility.Longyou-2 is of high quality,good plant type,late mature,blast resistance and cold tolerance.The new breed was appraised by Fujian Science and Technology Department in 2006. It has good characteristics, such as low critical sterility-reducing temperature （≤23.5℃）, stable sterility, long and stable sterile duration （〉 104d）, basic vegetative growth type, moderate growth period, good blast resistance, good combining ability, high stigma exertion and out-crossing rate. These factors suggest that Fulong S2 could he suitable for developing new super hybrid rice of wide adaptability, good quality and high yield with practical applications.