TY - JOUR
T1 - Small ad hoc versus large general training populations for genomewide selection in maize biparental crosses
AU - Brandariz, Sofía P.
AU - Bernardo, Rex
N1 - Publisher Copyright:
© 2018, Springer-Verlag GmbH Germany, part of Springer Nature.
PY - 2019/2/8
Y1 - 2019/2/8
N2 - Key message: For genomewide selection in each biparental population, it is better to use a smaller ad hoc training population than a single, large training population. Abstract: In genomewide selection, different types of training populations can be used for a biparental population made from homozygous parents (A and B). Our objective was to determine whether the response to selection (R) and predictive ability (r MP ) in an A/B population are higher with a large training population that is used for all biparental crosses, or with a smaller ad hoc training population highly related to the A/B population. We studied 969 biparental maize (Zea mays L.) populations phenotyped at four to 12 environments. Parent–offspring marker imputation was done for 2911 single nucleotide polymorphism loci. For 27 A/B populations, training populations were constructed by pooling: (1) all prior populations with A as one parent (A/*, where * is a related inbred) and with B as one parent (*/B) [general combining ability (GCA) model]; (2) A/* or */B crosses only; (3) all */* crosses (same background model, SB); and (4) all */*, A/*, and */B crosses (SB + GCA model). The SB model training population was 450–6000% as large as the GCA model training populations, but the mean coefficient of coancestry between the training population and A/B population was lower for the SB model (0.44) than for the GCA model (0.71). The GCA model had the highest R and r MP for all traits. For yield, R was 0.22 Mg ha −1 with the GCA model and 0.15 Mg ha −1 with the SB model. We concluded that it is best to use an ad hoc training population for each A/B population.
AB - Key message: For genomewide selection in each biparental population, it is better to use a smaller ad hoc training population than a single, large training population. Abstract: In genomewide selection, different types of training populations can be used for a biparental population made from homozygous parents (A and B). Our objective was to determine whether the response to selection (R) and predictive ability (r MP ) in an A/B population are higher with a large training population that is used for all biparental crosses, or with a smaller ad hoc training population highly related to the A/B population. We studied 969 biparental maize (Zea mays L.) populations phenotyped at four to 12 environments. Parent–offspring marker imputation was done for 2911 single nucleotide polymorphism loci. For 27 A/B populations, training populations were constructed by pooling: (1) all prior populations with A as one parent (A/*, where * is a related inbred) and with B as one parent (*/B) [general combining ability (GCA) model]; (2) A/* or */B crosses only; (3) all */* crosses (same background model, SB); and (4) all */*, A/*, and */B crosses (SB + GCA model). The SB model training population was 450–6000% as large as the GCA model training populations, but the mean coefficient of coancestry between the training population and A/B population was lower for the SB model (0.44) than for the GCA model (0.71). The GCA model had the highest R and r MP for all traits. For yield, R was 0.22 Mg ha −1 with the GCA model and 0.15 Mg ha −1 with the SB model. We concluded that it is best to use an ad hoc training population for each A/B population.
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U2 - 10.1007/s00122-018-3222-3
DO - 10.1007/s00122-018-3222-3
M3 - Article
C2 - 30390129
AN - SCOPUS:85055987073
SN - 0040-5752
VL - 132
SP - 347
EP - 353
JO - Theoretical and Applied Genetics
JF - Theoretical and Applied Genetics
IS - 2
ER -