Genetic and environmental stability analysis of peanut sucrose content.

Sucrose content of peanut seeds is an important quality indicator for edible peanuts. In this study, we analyzed the main gene plus multigene genetic model for sucrose content based on peanut recombinant inbred lines from continuous generation populations, and investigated the effects of environmental factors on sucrose content based on the investigation of phenotypic variation of different varieties in various geographical locations. The results revealed that 4 main genes plus additive-epistasis (4MG-AI) was the optimal model in all three generations of the RIL population. The heritabilities of the main genes ranged from 80.8% to 96.1%, indicating a high degree of heritability for peanut sucrose content. Among the four main genes, the 1st and the 2nd main gene explained the phenotypes 30%-52.2% and 25.1%-29.6%, respectively, while the third and fourth pairs of main effect genes explained the phenotypes at smaller rates. Based on the stability analysis of sucrose content of nine peanut materials, including Zhonghua 16, in five different environments, it was found that the coefficients of variation ranged from 17.39% to 39.08%, and that the stability of different materials varied. The environmental stability of sucrose content was varied across different varieties. This study showed that peanut sucrose content is a quantitative trait with high heritability, but it is also affected by environmental factors. The germplasms or varieties with high sucrose content and environmental stability were suggested to be further screened for genetic breeding and functional gene discovery in future breeding. [ABSTRACT FROM AUTHOR]