Abstract
Key message
Genetic dissection uncovered a major QTL QTKW.caas-4BS corresponding with a 483 kb deletion that included genes ZnF, EamA and Rht-B1. This deletion was associated with increased grain weight and semi-dwarf phenotype.
Abstract
Previous studies identified quantitative trait loci (QTL) for thousand kernel weight (TKW) in the region spanning the Rht-B1 locus in wheat (Triticum aestivum L.). We recently mapped a major QTL QTKW.caas-4BS for TKW spanning the Rht-B1 locus in a recombinant inbred line (RIL) population derived from Doumai/Shi 4185 using the wheat 90K array. The allele from Doumai at QTKW.caas-4BS significantly increased TKW and kernel number per spike, and conferred semi-dwarf trait, which was beneficial to improve grain yield without a penalty to lodging. To further dissect QTKW.caas-4BS, we firstly re-investigated the genotypes and phenotypes of the RILs and confirmed the QTL using cleaved amplified polymorphic sequence (CAPS) markers developed from flanking SNP markers IWA102 and IWB54814. The target sequences of the CAPS markers were used as queries to BLAST the wheat reference genome RefSeq v1.0 and hit an approximate 10.4 Mb genomic region. Based on genomic mining and SNP loci from the wheat 660K SNP array in the above genomic region, we developed eight new markers and narrowed QTKW.caas-4BS to a genetic interval of 1.5 cM. A 483 kb deletion in Doumai corresponded with QTKW.caas-4BS genetically, including three genes ZnF, EamA and Rht-B1. The other 15 genes with either differential expressions and/or sequence variations between parents were also potential candidate genes for QTKW.caas-4BS. The findings not only provide a toolkit for marker-assisted selection of QTKW.caas-4BS but also defined candidate genes for further functional analysis.
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Abbreviations
- CAPS:
-
Cleaved amplified polymorphic sequence
- CDS:
-
Coding sequence
- dCAPS:
-
Derived cleaved amplified polymorphic sequence
- GA:
-
Gibberellin acid
- GWAS:
-
Genome-wide association study
- ICIM:
-
Inclusive composite interval mapping
- KASP:
-
Kompetitive allele-specific PCR
- KNS:
-
Kernel number per spike
- LOD:
-
Logarithm of odds
- ORF:
-
Open reading frame
- PH:
-
Plant height
- qPCR:
-
Quantitative PCR
- QTL:
-
Quantitative trait locus
- RIL:
-
Recombinant inbred line
- SN:
-
Spike number per square meter
- SNP:
-
Single nucleotide polymorphism
- SSR:
-
Simple sequence repeat
- STS:
-
Sequence-tagged site
- TKW:
-
Thousand kernel weight
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Acknowledgements
The authors are grateful to Prof. R. A. McIntosh, Plant Breeding Institute, University of Sydney, for review of this manuscript. This work was funded by the National Key Research and Development Programs of China (2016YFD0101802), National Key Technology R & D Program of China (2014BAD01B05) and CAAS Science and Technology Innovation Program.
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Xu, D., Wen, W., Fu, L. et al. Genetic dissection of a major QTL for kernel weight spanning the Rht-B1 locus in bread wheat. Theor Appl Genet 132, 3191–3200 (2019). https://doi.org/10.1007/s00122-019-03418-w
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DOI: https://doi.org/10.1007/s00122-019-03418-w