Genetic Analysis of Tiller-related Traits in Forage Sorghum
Tillering as an important agronomic trait of forage sorghum,is controlled by genes and environment,and has an important impact on the yield and quality of forage sorghum.In order to further explore the genetic mechanism of forage sorghum tillering and the effect of tillering on the morphology and yield of forage sorghum,this experiment took the variety'TS-185'with more tillers and the variety'Xinliang-52'with fewer tillers as the parents configuration crosses combine to obtain the F2 generation.The number of tillers,stem thickness,number of stem nodes,and morphological differences such as the leaf number of main stemand tillers,plant height,ear length,ear weight,and stem fresh weight were counted,and the relative difference of different traits between main stem and tiller were calculated,and the use of the main gene-polygene genetic model for genetic analysis.The results showed that plant height,number of leaves,ear length,ear weight,and stalk fresh weight all have extremely signif-icant positive correlations between the main stem and tiller.The four traits,the number of tillers,the relative dif-ference in plant height between main stem and tiller,the relative difference in ear length,and the relative differ-ence in ear weight,are consistent with the B-l model controlled by two pairs of major genes,that is,the addi-tive-dominant-epistatic mixed inheritance model.The generalized heritability rates are 36.43％,82.71％,63.07％and 85.06％,respectively.The latter three traits can be stably inherited in the offspring and can be selected in the early generation of breeding.The relative difference in stem thickness,number of stem nodes,number of main stem and tiller leaves,and relative difference in stalk fresh weight are shown in this experiment as the traits controlled by minor genes and controlled by non-major genes.This study has guiding significance for the genetic effects of forage sorghum tillers and the influence of tillers on the morphological differences of forage sorghum.
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