Abstract
Forage sorghum is an important raw material for winemaking and livestock feed. It has many excellent agronomic traits. Its genome-wide sequencing work has been completed. Molecular marker-assisted selection technology is widely used in sorghum breeding work. The number of genetic loci affecting the sorghum agronomic traits has been Be positioned. Tillering, as an important plant type trait, has an important influence on the physiological characteristics of sorghum, such as the tolerance, lodging resistance and light absorption efficiency. At present, considerable progress has been made in gene mapping of plant height, ear length, leaf morphology and other traits of forage sorghum. However, the progress of gene mapping for tillering is relatively slow due to the fact that tillering traits are easily affected by various factors. This study summarized the recent research progress of QTL mapping for tillering traits and other agronomic traits in sorghum, and proposed that some conserved sequences with high homology were retained during the evolution of different crop varieties, which proved that there was correlation between different traits of the same species. In sorghum breeding research, combining genetic engineering breeding with experimental statistics and quantitative genetics can better reveal the contribution of various factors to sorghum agronomic traits, improve breeding efficiency and reduce the loss of human and material resources.
Highlights
Sorghum (Sorghum bicolor (L.) Moench) is an important food crop in Asian and African countries
This study summarized the recent research progress of QTL mapping for tillering traits and other agronomic traits in sorghum, and proposed that some conserved sequences with high homology were retained during the evolution of different crop varieties, which proved that there was correlation between different traits of the same species
Tillering is affected by the interaction of genetic environment and it is difficult to make a clear explanation at the molecular level
Summary
Since the 1990s, the knowledge of sorghum genetics has made significant progress. A variety of genetic studies have been conducted on quality traits and important agronomic traits of grains by drawing population and genetic maps. 2.2.2 Interval mapping method Due to the shortcomings of the single-marker mapping method, Lander and Botstein proposed the interval mapping method in 1989 It is based on the genetic assumption that phenotypic variation is controlled by genetic effects and residual errors, and there is no interaction between genetic environment. 2.2.4 Compound interval mapping method based on mixed linear model (MCIM) This method is a method proposed by Zhu Jun in 1999 that includes additive effects, dominant effects and interaction effects with the environment This method takes the population mean and the main genetic effects of QTL as fixed effects, and takes environmental effects, QTL locus-environmental interaction effects, and molecular marker effects as random effects. It can overcome the failure of the above several QTL mapping methods to correctly analyze the interaction between genotype and environment and various genetic effects (Kao and Zeng, 1997)
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