摘要
本研究选用抗寒性存在差异的假俭草品种E142和E022为亲本配制杂交组合,获得了杂种F1群体;利用电解质渗透法对F1群体及其亲本进行抗寒性鉴定,利用植物主基因+多基因遗传分离分析方法分析假俭草抗寒性遗传特征。结果表明,1)杂种F1群体不同单株间的抗寒变异较大,变异范围为-9.63^-1.45℃,变异系数为-29.27%。2)F1群体的抗寒性呈连续的混合正态分布,符合植物主基因+多基因遗传模型。3)假俭草的抗寒性状最适遗传模型为B-1,即抗寒性状受2对主基因加性-显性-上位性控制,主基因的遗传率为91.28%。本研究明确了假俭草抗寒性状的遗传规律,为假俭草抗寒育种提供了科学依据,也为假俭草抗寒育种创造了材料。
F1 hybrids between two cultivars（E142 and E022） with different cold tolerance were produced.A total of 83 true hybrids,together with their parents,were tested for cold tolerance using an electrolyte leakage（EL） assay based on LT50.The inheritance of cold tolerance in the F1 population was analyzed using the Major Genes and Polygenes Genetic Analysis method.1） The variation of cold tolerance in the F1 population was high,with the LT50 ranging from-9.63 to-1.45℃ and the coefficient variation was-29.27%;2） The frequency distribution of cold tolerance in F1 populations showed a continuous mixed normal distribution pattern,a diagnostic of major genes and polygene inheritance models;3） The best genetic model for cold tolerance of this population was model B-1,namely that this character was controlled by two major genes with additive-dominant-epistatic effects,and the heritability of the major genes was 91.28%.These results not only provided useful information but also basic materials for genetic improvement of cold tolerance in Eremochloa ophiuroides.
出处
《草业学报》
CSCD
北大核心
2011年第2期290-294,共5页
Acta Prataculturae Sinica
基金
国家自然科学基金(30670200)
广西林业科学院基金项目(林科200807号)资助
关键词
假俭草
抗寒性
F1群体
遗传分析
Eremochloa ophiuroides
cold tolerance
F1 population
genetic analysis
