Abstract: During 2009-2010, salt tolerance(ST) of 49 introgression line populations derived from Minghui 86 were evaluated according to performance of STrelated traits including percentage of survival plants, seed setting rate and grain weight per plant under 0.5% salinization (sea water+fresh water) over the whole growth stage. The results indicated that the populations differed in ST  even derived from the  same subspecies, indica or japonica. The introgression populations originated from japonica parents showed better ST than those originated from indica parents. The four populations with Shennong 265, Y134, Zaoxian 14 and Gayabyeo as donor parents had high percentage  of salttolerant lines, 10.04%, 6.98%, 11.83% and 7.9%, respectively. High reproducibility of  the results in the two years conformed the high reliability. The hybrids between the restorer lines with ST and Xieqingzao A were evaluated for heterosis under  conventional cultivation. Six elite combinations with better performance in panicle number per plant, spikelet number per panicle, 1000grain weight and grain yield per plant were selected from the progenies of Xieqingzao A/salttolerant restore lines under conventional cultivation. Field salt stress over whole growth stage  creat favorable conditions  for breeding of hybrid rice with ST and high yield potential.

Key words: rice, salt tolerance, restorer line, breeding

摘要： 2009-2010年在浙江省三门县沿海滩涂采用0.5%盐浓度海水进行全生育期灌溉的方法，以胁迫后植株存活率、单株结实率和单株粒重为指标对明恢86背景的49个回交导入系群体进行全生育期耐盐性评价。结果表明，不同群体的田间耐盐性存在很大差异，粳稻供体导入系群体的田间耐盐性总体好于籼稻供体的导入系群体，而且在同一亚种内不同供体品种的导入系群体的耐盐性差异明显。其中，沈农265、Y134、早籼14和Gayabyeo 为供体的4个导入系群体的耐盐株系的比率较高，分别为10.04%、6.98%、11.83%和7.9%。耐盐重复鉴定表明，大田全生育期耐盐性鉴定结果具有较高的可靠性。在常规栽培条件下对丰产性较好的耐盐恢复系与协青早A测交种进行鉴定，筛选出单株穗数、每穗总粒数和千粒重优势明显，单株产量比生产上对照组合显著增加的杂交组合6个。研究表明，利用大田全生育期盐胁迫筛选耐盐恢复系，不仅可以选育到在常规栽培条件下的高产组合，而且将为高产耐盐杂交新组合的选育创造有利条件。

关键词: 水稻, 耐盐性, 恢复系, 育种