Abstract: Genetic analysis of plant architecture traits is crucial to the theories,methods and strategies of Sorghum breeding.The aim of this study is to clarify the genetic rules of plant architecture traits and gene functioning,and to provide a theoretical basis for the selection of these traits in the field.F₂ populations derived from grain Sorghum elite lines Yin-20 and XL52 were characterized 6 plant architecture traits including leaf angle,plant height,panicle length,average internode length,leaf length and leaf width,and genetic analysis was conducted using major gene plus polygene mixed genetic model for quantitative traits.The results showed that the inheritance of Sorghum leaf angle well fit into B_1 model,i.e.the mixed genetic model of additivity-dominance-epistasis,and the heritability of major genes was 70.15%;while plant height with the B_2 model,i.e.additivity-dominance,74.26%;panicle length with codominance B_6 model,58.67%;average internode length with A_1 model,i.e.additivity-dominance,68.69%;leaf length with B_1 model,47.92%;leaf width with B_6 model,i.e.complete dominance,61.60%.Among these traits,the leaf angle and plant height regarding as the main factors contributing to plant architecture showed high heritability,selection in early generation,easier to obtain ideal materials.

Key words: Sorghum, Plant architecture traits, Genetic analysis of major gene and polygene, Major genes heritability

CLC Number: 

• S514.03