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Genetic Diversity and Core Collection Evaluations in Common Wheat Germplasm from the Northwestern Spring Wheat Region in China

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Abstract

Fluorescence microsatellite markers were employed to reveal genetic diversity of 340 wheat accessions consisting of 229 landraces and 111 modern varieties from the Northwest Spring Wheat Region in China. The 340 accessions were chosen as candidate core collections for wheat germplasm in this region. A core collection representing the genetic diversity of these accessions was identified based on a cluster dendrogram of 78 SSR loci. A total of 967 alleles were detected with a mean of 13.6 alleles (5–32) per locus. Mean PIC was 0.64, ranged from 0.05 to 0.91. All loci were distributed relatively evenly in the A, B and D wheat genomes. Mean genetic richness of A, B and D genomes for both landraces and modern varieties was B > A > D. However, mean genetic diversity indices of landraces changed to B > D > A. As a whole, genetic diversity of the landraces was considerably higher than that of the modern varieties. The big difference of genetic diversity indices in the three genomes suggested that breeding has exerted greater selection pressure in the D than the A or B genomes in this region. Changes of allelic proportions represented in the proposed core collection at different sampling scales suggested that the sampling percentage of the core collection in the Northwest Spring Wheat Region should be greater than 4% of the base collection to ensure that more than 70% of the variation is represented by the core collection.

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Authors and Affiliations

  1. Key Laboratory of Crop Germplasm & Biotechnology, MOA, Institute of Crop Germplasm Resources, Chinese Academy of Agricultural Sciences, Beijing, 100081, China

    C. Y. Hao, X. Y. Zhang, L. F. Wang, Y. S. Dong & J. Z. Jia

  2. Gansu Agricultural University, Lanzhou, 730070, China

    X. W. Shang

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  1. C. Y. Hao
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  2. X. Y. Zhang
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  3. L. F. Wang
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  4. Y. S. Dong
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  5. X. W. Shang
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  6. J. Z. Jia
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Correspondence to X. Y. Zhang.

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Hao, C.Y., Zhang, X.Y., Wang, L.F. et al. Genetic Diversity and Core Collection Evaluations in Common Wheat Germplasm from the Northwestern Spring Wheat Region in China. Mol Breeding 17, 69–77 (2006). https://doi.org/10.1007/s11032-005-2453-6

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  • DOI: https://doi.org/10.1007/s11032-005-2453-6

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