Genomewide Selection and Marker-Assisted Recurrent Selection in Doubled Haploid versus F2 Populations

被引:55
作者
Mayor, Patricio J. [1 ]
Bernardo, Rex [1 ]
机构
[1] Univ Minnesota, Dep Agron & Plant Genet, St Paul, MN 55108 USA
关键词
QUANTITATIVE TRAITS; MAIZE; QTL; EFFICIENCY; RESISTANCE; ACCURACY; BIAS; LINE;
D O I
10.2135/cropsci2008.10.0587
中图分类号
S3 [农学(农艺学)];
学科分类号
0901 ;
摘要
Molecular markers have been previously found useful for increasing genetic gain in maize (Zea mays L.). The use of doubled haploids (DHs) instead of F-2 plants (or, equivalently, F-3 families) may permit a better estimation of marker-trait associations. Our objective was to determine the usefulness of DH versus F-2 populations in marker-assisted recurrent selection (MARS) and genomewide selection. We simulated testcrosses from a DH population and an F-2 population from the same cross between two inbreds and studied genetic models defined by the number of quantitative trait loci (QTL) and trait heritability (H). Equal-time comparisons of selection response were between Cycle 3 with an F2 population and Cycle 2 with a DH population. For the genetic model of 100 QTL, H = 0.20 and a population size of N = 100, the ratio of response to selection in DH versus F-2 populations was R-DH:F2 = 109% for genomewide selection and 128% for MARS. For the genetic model of 20 QTL, H = 0.80 and N = 100 these values decreased to 99% for genomewide selection and 109% for MARS. Although genomewide selection was superior to MARS for a given type of population, the advantage of using DH instead of F-2 populations was greater in MARS than in genomewide selection. We concluded that DH populations are most useful in genomewide selection and MARS when many QTL control the trait, H is low, and N is small.
引用
收藏
页码:1719 / 1725
页数:7
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