用籼、粳型两用核不育系与生产上推广的优良籼稻品种或具有某1～2个特异性状的种质进行广泛配组杂交,多代选择,以期育成新的两用核不育系。通过多年培育选择,已选出具有育性转换明显的两用核不育材料20份.其中从 K-7S/03的后代中选出的0821S,无论育性还是经济性状均已稳定.用自然光照(长日)和10小时定光处理,在高温条件下均表现不育。1991～1993年在自然条件下分期播种观察,从7月20日至9月17日为稳定的不育期,镜检花粉不育率均在99%以上,自然结实率0;9月17～19日起,逐步转为可育,其育性转换特性与其它温敏型两用核不育系相似,亦属温敏型两用核不育系.该不育系属早籼稻类型,全生育期比 W6154S 迟2～3天,5月下旬播种,播始天数60～63天,6月中旬播种,播始天数50多天,活动积温1700℃左右;株高70cm 左右,分蘖力中等,每穗颖花数90～104个,千粒重20.7g;稃尖无色,谷粒细长(长宽比3.1),胚乳半透明,无垩白,外观品质优良;开花习性好,柱头外露率53.6%;感光性弱,感温性强.经用4个籼稻品种分别与0821S、8902S、W6154S 测交,对其 F_1的产量性状观察,0821S 配的杂种千粒重较轻,但每穗总粒数明显高于其它二个核不育系配的杂种,其余产量性状与另二个核不育系配的后代无显著差异,但是,米粒外观品质明显优于8902S、W6154S 测交的杂一代,表现为米粒细长,无垩白或垩白极少,胚乳半透明,因此,初步认为0821S 在稻米品质性状上有良好的配合力,是一个有利用价值的优质籼型核不育系. The indica and japonica dual-purpose genic male sterile lines were used for extensive crossbreeding and multiple generations selection with excellent indica rice variety or some germplasm with 1-2 specific traits in order to breed new dual-purpose nuclear sterile system. Through years of cultivation options, 20 copies of fertile dual-use nuclear fertility material have been selected, of which 0821S, selected from the progeny of K-7S / 03, has been stable regardless of fertility or economic traits. Light (long day) and 10 hours fixed light treatment, the performance of infertility in high temperature conditions. From 1991 to 1993, it was staged seeding observation under natural conditions, from July 20 to September 17 was a stable period of sterile, pollen sterility of microscopic examination were above 99%, natural seeding rate 0; September 17 ~ On the 19th, it gradually turned into fertile, and its fertility conversion characteristics are similar to other thermo-sensitive dual-purpose nuclear sterile lines, which are also thermo-sensitive dual-purpose nuclear sterile lines. The growth period is 2 ~ 3 days later than that of W6154S, sowing in late May, the days of sowing are 60 ~ 63 days, the sowing is in mid June, the days of sowing are more than 50 days, the accumulated temperature is about 1700 ℃; Spikelets per spike 90 to 104, grain weight 20.7g; tip sharp colorless, slender grain (aspect ratio 3.1), endosperm translucent, non-chalky appearance of good quality; flowering habits, stigma exposed rate of 53.6 %; Sensitive to light, strong sense of temperature.Using four indica rice varieties and 0821S, 8902S, W6154S respectively, its F_1 yield traits observation, 0821S hybrids with 1000-grain weight lighter, but the total grain number per spike was significantly higher The other two sterile lines with hybrids, the other yield traits and other two sterile lines with no significant difference between the progenies, but the appearance of rice grain quality was significantly better than the 8902S, W6154S test Of the miscellaneous generation, the performance of rice slender, no chalky chalk or very few, endosperm translucent, therefore, initially thought 0821S in rice quality traits have good combining ability, is a valuable use of high quality indica type kernel Department of education.