Abstract: The parents Jiucaiqing and IR26 as well as their F₁ , F₂ generations were used to analyze the inheritance of salt tolerance in rice landrace Jiucaiqing from Taihu Lake region. Two indexes, the salinity tolerance rating (STR) and Na⁺/K⁺ in root of the plants derived from the tillering-line were used for salt tolerance evaluation. Under 0.8% NaCl stress, there existed a significant difference between parents, over-parent heterosis in F₁ and continuity in F₂ population in the STR and Na⁺/K⁺ in root. The STR and Na⁺/K⁺ in root w ere both primarily controlled by two pairs of major genes with concomitant of subordinate effects from polygenes. The major gene heritability of the STR was only 16.10%, while that of the Na⁺/K⁺ in root was as high as 50. 78%. The total heritability of major plus polygenes of each index was above 70%.

Key words: rice, salt tolerance, inheritance, gene

摘要： 为了研究太湖流域强耐盐粳稻地方品种韭菜青的苗期耐盐性遗传机理，配制了韭菜青/IR26籼粳杂交组合，在盐胁迫条件下，运用剥蘖分株法鉴定了P[sub]1[/sub]、P[sub]2[/sub]、F[sub]1[/sub]和F[sub]2[/sub]苗期的盐害级别和根系Na+/K+两个耐盐相关指标。结果表明，在0.8%的NaCl胁迫下，亲本的两个耐盐相关指标有明显的差异，F[sub]1[/sub]均表现出超亲优势，F[sub]2[/sub]呈正态混合分布。采用主基因多基因遗传模型进行遗传分析，发现韭菜青苗期的盐害级别和根系Na[sup]+[/sup]/K[sup]+[/sup]均由2对主效基因控制，并存在多基因修饰。盐害级别的主基因遗传率仅为16.10%，而根系Na[sup]+[/sup]/K[sup]+[/sup]的主基因遗传率高达50.78%，两个指标的主基因加多基因共同解释的遗传率都在70%以上。

关键词: 水稻, 耐盐性, 遗传, 基因