黄淮海地区大豆品种苗期根系性状的遗传变异及与耐逆境胁迫的关系

从83份黄淮海地区代表性大豆地方品种和育成品种(系)中按根系类型选取32份,用以研究苗期根系性状的遗传特点、与地上部性状的相关以及与逆境胁迫的关系。大豆苗期一级侧根数、主根长、根干质量、总根长和根体积等性状,在品种间、各苗龄间均存在显著遗传变异;根系性状与整株干质量呈高度相关;根干质量、根总长和根体积的相对值与耐旱平均隶属函数值,一级侧根数、主根长、总根长、根体积、根干质量的相对值与耐铝毒平均隶属函数值呈极显著相关,且根系性状的相对值在品种间存在显著变异,可用做耐逆性选择的根系指标。

Genetic Variation of Root Traits at Seedling Stage and Their Relationship with Stress Tolerances in Soybean

Thirty two accessions of soybean(Glycine max(L.)Merr.)selected from 83 representative entries from Huang-huai-hai Region according to their root performance were used to study their genetic variation of root traits at seedling stage and their relationship with above-ground traits and tolerance to abiotic stresses.Dry root weight,total root length and root volume of accessions from Middle-Lower Chang-jiang Valleys with later maturity developed more quickly than those from Huang-huai-hai Valleys with earlier maturity.The correlations between these root traits and whole plant dry weight were pretty high,those between the mean membership index of drought tolerance and the relative values of total root length,root volume and dry root weight per plant were all significant at 0.01 level and so did for the correlations between mean membership index of aluminum toxin tolerance and the stressed to unstressed relative values of number of lateral roots,tap root length,total root length,root volume and dry root weight.These relative root traits had wide variation among accessions and could be used for identification of drought and aluminum tolerance.