摘要： 从83份黄淮海地区代表性材料中按根系类型选取28份，在苗期以株高、叶龄、根干质量和茎叶干质量隶属函数的平均值为指标进行2年耐旱性重复鉴定，从中筛选出晋豆14强耐旱型材料。比根干质量、比总根长、比根体积与耐旱隶属函数值均呈极显著正相关，可作为耐旱性的根系性状指标。利用科丰1号×南农1138-2衍生的RIL群体为材料，对耐旱相关根系性状采用主基因+多基因混合遗传模型分离分析法进行遗传分析。结果表明，该两亲本间比根干质量、比总根长、比根体积的遗传均为两对主基因加多基因模型，后两者主基因间有连锁(重组率4.30%，1.93%)；主基因遗传率为62.26%～91.81%，多基因遗传率为2.99%～24.75%；耐旱相关根系性状各主要由1对主基因控制，另1对效应较小，三性状的改良均着重在主基因加性效应。

关键词: 大豆, 耐旱性, 根系性状, 遗传, 数量性状分离分析

Abstract: Twenty eight accessions of soybean (Glycine max (L.) Merr.) selected from 83 ones from Huanghuaihai were tested in two years for their tolerance to drought by using the mean membership index value averaged over those of plant height, leaves number, dry root weight and dry stem and leaf weight. One most tolerant accessions (Rank 1) was identified. There existed very significant correlations between drought tolerance and relative values of dry root weight, total root length, and root volume (per plant dry weight basis), respectively, which could be used as root indicators of drought tolerance. The RIL population derived from Kefeng 1 × Nannong 1138-2 was used to analyze the inheritance of the three relative root traits by using the segregation analysis of quantitative trait under the major gene plus polygene mixed inheritance model. The results showed that between the two parents, the relative values of dry root weight, total root length and root volume were respectively controlled by two major genes (linked together for the latter two traits, recombination value being 4.30% and 1.93%, respectively) plus polygenes with their major gene heritability values 62.26%-91.81% and polygene heritability values 2.99%-24.75%, indicating that major gene, especially the one with large effect, accounted for a major part of the genetic variation between the two parents. major gene additive effect could be intensified for improving all of them.

Key words: Soybean (Glycine max (L) Merr.), Drought tolerance, Root trait, Inheritance, Segregation analysis of quantitative trait

中图分类号: 

• S565.101