Evaluation of five strategies for obtaining a core subset from a large genetic resource collection of durum wheat
Evaluation of five strategies for obtaining a core subset from a large genetic resource collection of durum wheat
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DOI：
10.1007/bf01184915
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发表时间：
1993-11
影响因子：
5.4
通讯作者：
P. S. Zeuli;C. Qualset
中科院分区：
文献类型：
--
作者：
P. S. Zeuli;C. Qualset
通过指定称为核心样本的子样本，可以提高对大型植物遗传资源的利用。利用4个定性性状和8个定量性状，对从3000份硬粒小麦材料中筛选核心样品的5种策略进行了评价。以下每种策略都为核心样本生成了大约500个条目：随机的、随机系统的（根据条目进入集合的时间顺序）、按原产国分层、按原产国的对数频率分层、按规范变量分层。前三种策略产生了代表整个集合的样本，但其余两种策略产生了期望的效果，即在几个字符中，来自代表性较低的原产国的频率增加。分层的典型样本增加了表型方差。岩心样品的质量取决于良好的护照和评估数据来划分收集。多变量方法非常有用，但需要来自整个集合的大量数据。在缺乏某些特征评价数据的情况下，可以使用生态地理起源来选择有用的岩心样本。
The use of plant genetic resources contained in a large collection may be enhanced by specifying subsamples, called core samples. Five strategies for selecting a core sample from a collection of 3000 durum wheat accessions were applied and evaluated using four qualitative and eight quantitative spike characters. Each of the following strategies generated about 500 accessions for the core sample: random, random-systematic according to chronology of entry of the accessions into the collection, stratified by countryof-origin, stratified by log frequency by country-of-origin, and stratified by canonical variables. The first three strategies produced samples representative of the whole collection, but the remaining two produced the desired effect of increasing frequencies from less-represented countries-of-origin for several characters. The stratified canonical sample increased phenotypic variances. The quality of core samples is dependent upon good passport and evaluation data to partition the collection. The multivariate approach is extremely useful, but requires considerable data from the whole collection. Ecogeographic origin may be used in the absence of evaluation data on several characters to select useful core samples.