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CHINESE JOURNAL OF OIL CROP SCIENCES ›› 2021, Vol. 43 ›› Issue (4): 600-.doi: 10.19802/j.issn.1007-9084.2020251

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Genetic analysis of peanut quality traits based on a diallel cross design

  

  1. Henan Academy of Crops Molecular Breeding ,Henan Academy of Agricultral Science/Key Laboratory of Oil Crops in Huanghuaihai Plains, Ministry of Agriculture and Rural Affairs / Henan Provincial Key Laboratory for Oil Crops Improvement/Henan Biological Breeding Center Co., Ltd., Zhengzhou 450002, China
  • Online:2021-08-28 Published:2021-08-27

Abstract:

In order to improve the efficiency of selecting elite combinations, five parental lines were selected to make 20 cross combinations by Griffing complete diallel crossing design, and 10 quality traits including contents of oil, protein, sucrose and fatty acid compositions in peanut kernel were tested to assess the combining ability and genetic parameters. Analysis of combination ability showed that Yuhua 132(W191)with high general combination ability(GCA)was the optimal lines for selecting high oil, stearic acid, linoleic acid, arachidic acid and behenic acid; Jihuatian 1(JT1)with high GCA was the optimal lines for selecting protein and sucrose; and WT08-0937(DF15)with high GCA was the optimal lines for selecting oleic acid and eicosenoic acid. Analysis of regression Wragainst Vr indicated that inheritance of 7 quality traits conformed to the additive-dominant mode, and the inheritance was mainly additive effect, while the dominant effect was small and partial dominant, which included oil, palmitic acid, stearic acid, oleic acid , linoleic acid, arachidic acid and behenic acid. Principal component analysis(PCA)was carried out for 10 traits of all hybrids, and the cumulative contribution rate of the first two principal components(Dim1 and Dim2)reached 88.6%. The results of PCA revealed that the oil content was negatively correlated with protein and sucrose content, while the oil content was weakly correlated with unsaturated fatty acid content.This study provided a theoretical basis for parents and off-spring selection in peanut breeding.

Key words: peanut, quality traits, diallel cross design, combining ability, additive allelic effect, principal component analysis

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