Genetic Effects of Antioxidant Components in Red Rice and Its Interactions with Environment
[Objective]This study aims to dissect the genetic effects of total phenols,total flavonoids,procyanidins,and anthocyanins in red rice,to offer insights for cultivating high-nutrition red hybrid rice.[Methods]Forty-eight hybrid combinations were generated using eight red rice restorer lines as male parents and six sterile lines as female parents.Employing the additive-dominance genetic model(AD model)and statistical methods,the study analyzed the genetic effects,heterosis,genetic correlation of antioxidant components in red rice across diverse environmental conditions,and their interactions with the environment.[Results]Genetic main effects primarily control anthocyanins,procyanidins,total phenols,and total flavonoids.Procyanidins,total phenols,and total flavonoids exhibit high narrow-sense heritability,mainly governed by gene additive effects,enabling effective early-generation selection.Anthocyanins are predominantly influenced by dominant effects,suitable for medium and high generation selection.All four antioxidant components display positive correlations among phenotype,genetics,additive and dominance effects,as well as additive×environment and dominance×environment interactions,with high correlation coefficients.Procyanidins exhibit a small genotype×environment interaction effect,indicating good stability.Using procyanidins as a selection indicator effectively enhances the other three components,reduces workload,and improves breeding efficiency.Higher temperatures contribute to increased accumulation of antioxidant components in red rice hybrid offspring,enhancing population heterosis.Elevating the content of antioxidant components in sterile lines benefits the cultivation of offspring with higher antioxidant content.Restorer lines 18Rr174 and 18Rr175 effectively increase the contents of total phenols,total flavonoids,and procyanidins in offspring and are less influenced by the environment.[Conclusion]Utilizing the additive-dominance genetic model for quantitative traits could effectively predict parental genetic effects on antioxidant components.18Rr174 and 18Rr175 can be used to breed red rice with high antioxidant activity components.
red riceantioxidant compositiongenetic effectgenotype×environmental interaction effect
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