摘要
采用６×６完全双列杂交设计分析了水稻苗期耐盐性遗传及配合力特性．２套４周龄秧苗分别用常规（对照）和常规加６０ｍｏｌ／ｍ３ＮａＣｌ营养液培养３周后分别考察ａ．死叶率等级、ｂ．相对生长量级别和ｃ．地上部Ｎａ＋含量３项指标．遗传分析表明：各指标的遗传变异中均以基因加性效应为主，ａ和ｃ还存在一定份量的非加性效应；环境效应皆显著且份量较大；指标ａ的遗传力相对较高．配合力分析表明：ａ和ｂ只有一般配合力（ＧＣＡ）显著；ｃ的ＧＣＡ和特殊配合力均显著，但以前者为主；ＧＣＡ与亲本耐盐力存在正相关．研究认为：杂交聚合耐盐基因是改良水稻耐性的基本途径；可根据亲本耐盐力初步估计其ＧＣＡ．
?Two sets of 4-wk-old seedlings from a 6×6 diallel crosses, developed from cv. Pokkali & 80-85 (tolerant), Xianchao & IR29725-25-22-3-3-3(moderately tolerant) and Dongguanbai & Peta (susceptable),were grown in normal (CK) and CK+60mol/m3NaCl culture solutions for 3 wk, respectively.Tolerance phenotypes were recorded by a.ranking of dead leaves,b.ranking of relative growth and c.shoot Na+ content,respectively.Genetic analysis showed predominant additive effect for a,b and c, significant dominant or non-additive effect for a & c, and larger environment effect for all indices. Combining ability analysis revealed significant general combining ability(GCA) effect for a and b,and both significant GCA and specific combining ability effect for c. Highly positive correlation between GCA and parental tolerance was observed.The results suggested that hybridization breeding based on favorable gene addition would be a basic method to enhance the resistance of rice to saline stress and that the parental GCA could roughly be estimated by the salt tolerance levels of varieties used.
出处
《华南农业大学学报》
CAS
CSCD
北大核心
1998年第2期31-35,共5页
Journal of South China Agricultural University
基金
广东省自然科学基金
关键词
水稻
耐盐性
双列杂交
遗传
配合力
Oryza sativa L.
salt tolerance
diallel cross
inheritance
combining ability
