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CHINESE JOURNAL OF OIL CROP SCIENCES ›› 2021, Vol. 43 ›› Issue (4): 590-.doi: 10.19802/j.issn.1007-9084.2020185

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Genetic analysis of sugar content in peanut kernel via mixed major gene plus polygene inheritance model in multi-generation combined population

  

  • Online:2021-08-28 Published:2021-08-27

Abstract:

Peanut(Arachis hypogaea L.)is an important oil and cash crop, cultivated worldwide. Sweetness is a highly heritable aspect of peanut flavor, and it is positively correlated with overall roasted peanut quality. Sweetness of peanut mainly comes from the content of sugar in peanut kernel, especially when the content of sugar is more than 6%. Therefore, increasing the sugar content in peanut kernel is the key to improving peanut flavor. However,up to now, the genetic analysis of sugar content in peanut kernel has not been reported. To investigate the genetic inheritance of sugar content in peanut, a mixed major gene plus polygene in-heritance model was employed to analyze in four generations(P1, P2, F1 and F2)of two cross combinations with high and low sugar content. The results showed that the genetic model E-0(MX2-ADI-AD), incorporating two additive – dominance – epitasis major genes plus an additive–dominance–epitasis polygene, was the best-fitting genetic model for sugar content in peanut kernel. The heritability of the major gene in the cross combinations with high sucrose content of peanut kernel as female parent was higher(84.96% and 83.00%), while the heritability of major gene was lower(69.52% and 60.32%)in the reverse cross combination with low sucrose content in peanut kernel; on the contrary, the heritability of polygene was lower in the orthogonal combination(14.87% and 16.75%)and higher in the reverse cross combination(3 23% and 39. 25% respectively, indicating that this trait has obvious maternal effect. These results suggested that the sugar content of peanut kernel was mainly controlled by major gene and should be selected in early populations. Therefore, our findings may provide important information for flavor quality modification of peanut and may lay the foundation for further QTL mapping.

Key words: sugar content, genetic analysis, major genes plus polygene, peanut

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