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A mini core subset for capturing diversity and promoting utilization of chickpea genetic resources in crop improvement

机译：捕获多样性并促进鹰嘴豆遗传资源在作物改良中的利用的微型核心子集

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摘要

A core collection is a chosen subset of large germplasm collection that generally contains about 10% of the total accessions and represents the genetic variability of entire germplasm collection. The purpose of a core collection is to improve the use of genetic resources in crop improvement programs. In many crops the number of accessions contained in the genebank are several thousands, and a core subset consisting of 10% of total accessions would be an unwieldy proposition. In this article we have suggested a two-stage strategy to select a chickpea mini core subset consisting of only about 1% of the entire collection held in trust at ICRISAT’s genebank (16,991 accessions). This mini core subset still represents the diversity of the entire core collection. The first stage involves developing a representative core subset (about 10%) from the entire collection using all the available information on origin, geographical distribution, and characterization and evaluation data of accessions. The second stage involves evaluation of the core subset for various morphological, agronomic, and quality traits, and selecting a further subset of about 10% accessions from the core subset. At both stages standard clustering procedure was used to separate groups of similar accessions. A mini core subset consisting 211 accessions from 1,956 core subset accessions, using data on 22 morphological and agronomic traits, was selected. Newman- Keuls’ test for means, Levene’s test for variances, the chi-square test and Wilcoxon’s rank-sum non-parametric test for frequency distribution analysis for different traits indicated that the variation available in the core collection has been preserved in the mini core subset. The most important phenotypic correlations which may be under the control of coadapted gene complexes, were also preserved in the mini core. This mini core subset, due to its drastically reduced size, will prove to be a point of entry to proper exploitation of chickpea genetic resources.
机译：核心种质是大型种质种质的选定子集，通常包含约10％的总种质，代表整个种质种质的遗传变异性。核心收藏的目的是在作物改良计划中改进遗传资源的利用。在许多作物中，种质库中包含的种质数为数千种，而占总种质10％的核心子集将是一个笨拙的主张。在本文中，我们提出了一种分两阶段的策略，以选择一种鹰嘴豆微型核心子集，该子集仅占ICRISAT种质库中保管的全部收藏品的约1％（16,991份）。这个微型核心子集仍然代表着整个核心集合的多样性。第一阶段涉及使用所有有关原产地，地理分布以及种质特征和评估数据的可用信息，从整个馆藏中开发代表性的核心子集（约10％）。第二阶段包括评估核心子集的各种形态，农艺和品质性状，并从核心子集中选择另一个约10％的种质子集。在两个阶段，均使用标准的聚类程序来分离相似组的组。利用22种形态和农艺性状的数据，从1956个核心子集的材料中选出211个核心子集。纽曼-库尔斯的均值检验，莱文的方差检验，卡方检验和威尔科克森的秩和非参数检验（针对不同性状的频率分布分析）表明，核心系列中的可用变异已保存在迷你核心中子集。可能在共适应的基因复合物控制下的最重要的表型相关性也保留在微型核心中。由于其极大地减小了体积，这种微型核心子集将被证明是适当开发鹰嘴豆遗传资源的切入点。

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  • 来源
    《Theoretical and Applied Genetics》 |2001年第8期|1292-1298|共7页
  • 作者

    H. D. Upadhyaya; R. Ortiz;

  • 作者单位

    Genetic Resources and Enhancement Program International Crops Research Institute for the Semi-Arid Tropics (ICRISAT) P.O. Patancheru 502 324 Andhra Pradesh India Fax: +91-40-3241239 e-mail: R.Ortiz@CGIAR.ORG;

    Genetic Resources and Enhancement Program International Crops Research Institute for the Semi-Arid Tropics (ICRISAT) P.O. Patancheru 502 324 Andhra Pradesh India Fax: +91-40-3241239 e-mail: R.Ortiz@CGIAR.ORG;

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  • 关键词

    Keywords Agronomic traits; Chickpea; Diversity; Mini core subset; Morphological traits;

    机译：农艺性状;鹰嘴豆;多样性;小核心亚群;形态学性状;

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