Genetic Analysis of Agronomic Characters in F2 Population of Sorghum bicolor

doi:10.7668/hbnxb.201751155

Abstract

Abstract: The quantitative genetic analysis of the agronomic traits of the sorghum F₂ population was carried out to determine the optimal genetic model of each trait and to master its genetic laws, which provided a reference for the agronomic traits in the field breeding genetic stability. F₂ populations derived from grain sorghum variety Xinliang 52 and Meiyin-20 were used as material, of which 6 agronomic traits were analyzed through major gene plus polygene mixed genetic model for quantitative traits. The results showed that among the six agronomic traits, the plant height, the length of the stalk, the number of main stems, and the average stem length were in accordance with the quantitative genetic model, which were controlled by major genes, while the spike length and flag sheath length were not controlled by major genes but inherited by micro genes. The plant height was well fit into Model B_1, i.e. The mixed genetic model of additivity-dominance-epistasis, which was controlled by two major genes, and the heritability of major genes was 88.65%; the ear handle length and main stem numbers was coincidence with the Model A_1, i.e. The additive-dominant hybrid genetic model for master-gene control, and the heritability rates were 61.58% and 68.94%, respectively; the average internode length was fit with Model A_4, i.e. The negative fully dominant genetic model, and the heritability rate was 49.24%. The genetic rate of the main gene of plant height, ear handle length and main stem numbers were higher than the other indices, indicating that the three traits were less affected by the environment in the inheritance of the offspring, the inheritance was relatively stable and could be directly selected in the early generation of breeding, while the heritability of the average internode length was lower, indicating that this trait was genetically unstable in the offspring, and was affected by the environment, which need to be selected in the high generation of breeding.

Key words: Sorghum bicolor, Agronomic traits, Major-multi-gene genetic analysis, Heritability

CLC Number:

S514.03

BAI Xiaoqian, YU Pengpai, LI Yanling, GAO Jianming, PEI Zhongyou, LUO Feng, SUN Shoujun. Genetic Analysis of Agronomic Characters in F₂ Population of Sorghum bicolor[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2019, 34(1): 107-114. doi: 10.7668/hbnxb.201751155.

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References

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