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摘要:Upland cotton(Gossypium hirsutum) is worldwide grown and renewable natural fiber source for the global textile industry and human life.Uncovering the genetic relationship of agronomic traits relating to fiber yield and quality is becoming important to cope with the increased demand of cotton fiber supply in both quantity and quality.Using an intraspecific population of 196 recombinant inbred lines(RILs) derived from a cross between 0-153,an elite cultivar harboring strong fiber strength genes and SGK9708,a cultivar with high yield and wide adaptability;we performed genome-wide genetic maps construction and QTL identification for traits relating to fiber yield and quality.Three separate linkage maps were constructed through SSR markers,SNP markers from CottonSNP63 K array and SNP markers from specific locus amplified fragment sequencing(SLAF-seq),respectively.The maps were named SSR-map,chip-map and SLAF-map,respectively.The SSR-map harbored 997 markers with a total genetic distance of 4,110 cM with an average distance of 5.2 cM between adjacent markers.A total of 165 QTLs of fiber quality traits were identified and 47 of them were estimated to be stable,which could be detected in at least three environments.Among the stable QTLs,14 were for fiber length,8 were for fiber strength,10 were for fiber elongation,5 were for fiber uniformity and 10 were for fiber micronaire.The chip-map harbored2,398 markers including 2,316 SNP markers and 77 SSR ones previously reported based on the same population.It spanned a total distance of2856.73 cM with an average marker interval of 1.20 cM.A total of 63 QTLs of fiber strength were identified and 15 of them were estimated to be stable.The SLAF-map harbored 5,521 SNP markers,which covered a total distance of 3259.37 cM with an average marker interval of 0.78 cM without gaps larger than 10 cM.A total of 146 QTLs of boll weight were identified and 16 of them were stable ones.Finally,the SSR-map,chip-map and SLAF-map were used as references;a high-density consensus genetic map was constructed by combining the above markers.The consensus map harbored 8,295 markers,spanned a total distance of 5056.96 cM,covering the whole genome of upland cotton,with an average marker interval of0.86 cM.Based the consensus high density map,the QTLs for fiber quality traits(fiber length,fiber strength,fiber micronaire,fiber elongation,and fiber uniformity) and the yield traits(boll weight,lint percentage,and seed index) were identified and their interactions dissected.These results could facilitate further studies including identification of the functioning genes and pyramiding breeding.
会议名称:

第七届国际作物科学大会

会议时间:

2016-08-14

会议地点:

中国北京

  • 专辑:

    农业科技

  • 专题:

    农作物

  • 分类号:

    S562

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