摘要： 为了阐明盐胁迫下水稻苗高的遗传特点,利用两个籼粳杂交的DH群体,在0.0 mmol/L NaCl胁迫下,采用数量性状主基因+多基因多世代联合分析方法对盐胁迫下水稻苗高遗传规律进行了分析.研究结果表明,水稻盐胁迫下的苗高受两对主效基因控制,两个DH群体的两对主基因分别表现为互补作用和累加作用,主基因的遗传力分别为28.56%和50.28%,微效多基因的遗传力为2.5%和29.9%,剩下的由环境决定.由两个DH群体主基因和多基因的遗传力表现和群体分离程度可知,DH-2群体更适合进行下一步耐盐基因的定位克隆.在选择遗传分析群体时,可以把群体亲本间的基因型差异和群体表现的极值范围作为一定的指示向导.

关键词: 水稻, 盐胁迫, 苗高, 遗传规律, DH群体, 主基因-多基因混合模型

Abstract: Two inter subspecific hybrid DH population under 0.40 mmol/L NaCl stress were used to analyze genetic trait of seedling height by using major genes plus polygenes mixed model.The result showed that,seedling height was controlled by two major gene expressing cumulative effect and complementation,multi-gene heritability was 28.56% and 50.28%,minor-polygene heritability was 42.54% and 29.94%,environment controlled the rest of that.DH-2 population was more suitable for gene locating and clone in the following step because of the manifestations of multi-gene heritability and minor-polygene heritability and the separation degree.Genotype difference between two parents and the range of extreme value can be used as selection criteria when choose population for genetic analysis.

Key words: Rice, Salt stress, Seedling height, Inheritance, DH population, Major genes plus polygenes mixed model

中图分类号: 

• S332.6

• Q311+.1