Abstract
Abstract Objectively selecting genotypes using genomic predictions for multiple traits warrants more empirical research. This study investigated how deployment of genomic prediction within the Clemson sorghum [ Sorghum bicolor (L.) Moench] breeding program would help to develop hybrids adapted to the eastern United States. Note that 9 years (2016–2024) of data collected on 1790 F 1 hybrids for grain yield, anthracnose resistance, days to anthesis, plant height, and test weight were used to calculate best linear unbiased estimates. Hybrid phenotypic data, in conjunction with genotype data for 1835 parents (983 R‐lines and 852 B‐lines), were used to train and test genomic prediction models. A model with general combining ability (GCA) effects only and a second with GCA and specific combining ability effects were used to estimate the breeding value of new parents and specific hybrid combinations, respectively. Prediction accuracy ( r ) using three cross‐validation strategies found that mean accuracies were high for plant height and moderate for grain yield, anthracnose resistance, days to anthesis, and test weight. An independent culling method using genomic prediction values for plant height and anthracnose was implemented to retroactively select seed and pollinator parents for testcrossing and specific hybrid combinations of superior seed and pollinator parents. Genomic selection of new F 4:5 parents resulted in approximately half of the total families within each fertility pool having one or more progeny advance to testcrossing, thereby avoiding overrepresentation of just a few pedigrees at the testcross phenotyping stage. Meanwhile, removing hybrids predicted above a height threshold and with an unacceptable level of anthracnose resistance led to 514 retained hybrids that had a significantly higher observed grain yield than the mean yield of 381 discarded hybrids. This tandem genomic selection scheme can advance the regional adaptation of individual fertility pools to support sorghum hybrid development for the eastern United States.
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Claims 6
Claim · model-written summary
Mean genomic prediction accuracy was high for plant height in sorghum hybrids.
SorghumOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“mean accuracies were high for plant height”
t0“sorghum hybrid adaptation”
Claim · model-written summary
Mean genomic prediction accuracy was moderate for grain yield, anthracnose resistance and days to anthesis.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“mean accuracies were high for plant height and moderate for grain yield, anthracnose resistance, days to anthesis, and test weight”
t0“sorghum hybrid adaptation”
Claim · model-written summary
Mean genomic prediction accuracy was moderate for test weight.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“mean accuracies were high for plant height and moderate for grain yield, anthracnose resistance, days to anthesis, and test weight”
t0“sorghum hybrid adaptation”
Claim · model-written summary
Genomic selection of new F4:5 parents led to approximately half of the families within each fertility pool having one or more progeny advance to testcrossing.
- Outcome
- total families within each fertility pool having one or more progeny advance to testcrossinge1
- Value
- approximately halfe1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“approximately half of the total families within each fertility pool having one or more progeny advance to testcrossing”
t0“sorghum hybrid adaptation”
Claim · model-written summary
Removing hybrids predicted above a height threshold and with unacceptable anthracnose resistance retained 514 hybrids with significantly higher observed grain yield than the mean yield of 381 discarded hybrids.
- Outcome
- observed grain yielde1
- Direction
- highere1
- Value
- 514 retained hybridse1
- Comparator
- mean yield of 381 discarded hybridse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“514 retained hybrids that had a significantly higher observed grain yield than the mean yield of 381 discarded hybrids”
t0“sorghum hybrid adaptation”
Claim · model-written summary
The authors conclude that the tandem genomic selection scheme can advance regional adaptation of fertility pools for sorghum hybrid development in the eastern United States.
- Outcome
- advance the regional adaptation of individual fertility poolse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“This tandem genomic selection scheme can advance the regional adaptation of individual fertility pools to support sorghum hybrid development for the eastern United States”