Theoretical and Applied Genetics

, Volume 126, Issue 1, pp 13–22 | Cite as

Genomewide predictions from maize single-cross data

  • Jon M. Massman
  • Andres Gordillo
  • Robenzon E. Lorenzana
  • Rex Bernardo
Original Paper

Abstract

Maize (Zea mays L.) breeders evaluate many single-cross hybrids each year in multiple environments. Our objective was to determine the usefulness of genomewide predictions, based on marker effects from maize single-cross data, for identifying the best untested single crosses and the best inbreds within a biparental cross. We considered 479 experimental maize single crosses between 59 Iowa Stiff Stalk Synthetic (BSSS) inbreds and 44 non-BSSS inbreds. The single crosses were evaluated in multilocation experiments from 2001 to 2009 and the BSSS and non-BSSS inbreds had genotypic data for 669 single nucleotide polymorphism (SNP) markers. Single-cross performance was predicted by a previous best linear unbiased prediction (BLUP) approach that utilized marker-based relatedness and information on relatives, and from genomewide marker effects calculated by ridge-regression BLUP (RR-BLUP). With BLUP, the mean prediction accuracy (r MG) of single-cross performance was 0.87 for grain yield, 0.90 for grain moisture, 0.69 for stalk lodging, and 0.84 for root lodging. The BLUP and RR-BLUP models did not lead to r MG values that differed significantly. We then used the RR-BLUP model, developed from single-cross data, to predict the performance of testcrosses within 14 biparental populations. The r MG values within each testcross population were generally low and were often negative. These results were obtained despite the above-average level of linkage disequilibrium, i.e., r 2 between adjacent markers of 0.35 in the BSSS inbreds and 0.26 in the non-BSSS inbreds. Overall, our results suggested that genomewide marker effects estimated from maize single crosses are not advantageous (compared with BLUP) for predicting single-cross performance and have erratic usefulness for predicting testcross performance within a biparental cross.

Supplementary material

122_2012_1955_MOESM1_ESM.pdf (64 kb)
Supplementary material 1 (PDF 63 kb)

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Copyright information

© Springer-Verlag 2012

Authors and Affiliations

  • Jon M. Massman
    • 1
  • Andres Gordillo
    • 2
  • Robenzon E. Lorenzana
    • 2
  • Rex Bernardo
    • 1
  1. 1.Department of Agronomy and Plant GeneticsUniversity of MinnesotaSaint PaulUSA
  2. 2.AgReliant GeneticsWestfieldUSA

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