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摘要:Linkage disequilibrium(LD) in the Chinese apricot(Prunus armeniaca L.)genome was analysed using 56 simple sequence repeat markers for 52 Chinese cultivars from two main eco-geographical populations from North China and Xinjiang regions(northwest of China).All the 56 SSR markers were detected621 alleles in the north China population and 391 alleles in Xinjiang population.The average gene diversity of the north China population was 0.71,and was0.647 in Xinjiang population.Polymorphism information content(PIC) in the north China ranged from 0.114(BPPCT006) to 0.911(CPPCT017) with an average of 0.686,and ranged from 0.09(CPPCT029) to 0.891(CPPCT030) in Xinjiang population with a mean of 0.622.Across the whole genome,the average LD coefficient r2 value was 0.0854 in the North China population and 0.0972 in the Xinjiang population.LD decayed rapidly with genetic distance of 0.19 cM in the North China populations and 4.02 cM in Xinjiang population at level of r2=0.1.For linkage groups,averaged r2 value ranged from 0.0575 of LG8 to 0.01001 of LG7 with a mean genetic distance of 9.22 cM in the North China population,and ranged from 0.0704 of LG3 to 0.1243 of LG8 with a mean genetic distance of8.36 cM in Xinjiang population.The low level of LD may be attributed to:1) a high recombination rate,2) the rich genetic diversity of the Chinese apricot centre of origin,or 3) the low allele frequency caused by a large number of rare alleles.Based on the extent of LD in Chinese apricot,a high density of markers for genome-wide association analysis or a candidate gene approach using markers targeted to only a few genes are the preferred approaches for association mapping.
会议名称:

XVI International Symposium on Apricot Breeding and Culture and XV Chinese National Symposium on Plum and Apricot

会议时间:

2015-06-29

会议地点:

Shenyang, China

  • 专辑:

    农业科技

  • 专题:

    园艺

  • 分类号:

    S662.2

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