Abstract
Thousand grain weight (TGW) is one of the three crucial determinants of wheat (Triticum aestivum) grain yield. The identification of functional genes and development of closely linked markers are urgently needed for wheat yield improvements. In this study, quantitative trait locus (QTL) mapping for TGW was carried out using one RIL population in four environments. A total of 8 QTL controlling TGW were detected across four chromosomes. Of them, QGW4B.4-17 was confirmed as a major and stable QTL for TGW increases of 2.19–3.06 g and high PVE of 22.5–36.3% in three environments. It was located in an interval (Rht1-TaGW-4B) of 2 Mb in physical distance that contains the Rht1 locus. Three high-confidence (HC) genes were predicted as potential candidates according to their annotated functions and expression profiles. Furthermore, a cleaved amplified polymorphic sequence (CAPS) marker, TaGW-4B, was developed and verified in a panel of 205 wheat cultivars and showed a highly significant correlation with TGW, demonstrating high value for efficient marker-assisted selection. The study provided a basis for cloning the functional genes underlying the QTL and a practical and accurate marker for molecular breeding.
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Abbreviations
- CAPS:
-
Cleaved amplified polymorphic sequence
- GWAS:
-
Genome-wide association study
- TGW:
-
Thousand grain weight
- KL:
-
Kernel length
- KW:
-
Kernel width
- KT:
-
Kernel thickness
- MTAs:
-
Significant marker-trait associations
- PVE:
-
Phenotypic variation explained
- QTL:
-
Quantitative trait locus
- RIL:
-
Recombinant inbred line
- SNP:
-
Single-nucleotide polymorphism
- HC:
-
High-confidence
- EST:
-
Expressed sequence tag
- MAS:
-
Marker-assisted selection
- SSR:
-
Simple sequence repeat
- GY:
-
Grain yield
- AE:
-
Average environment
- A×E:
-
Additive-by-environment interactions
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Acknowledgments
The SNP analysis and the construction of the genetic maps were kindly conducted by Dr. Mingcheng Luo from the University of California, Davis, and by Dr. Jirui Wang of Sichuan Agricultural University.
Funding
This work was supported by the National Natural Science Foundation of China (31971936), the Science and Technology of Shandong project (2017GNC11105, 2019LZGC001-3, ZR2019ZD15 and 2019YQ028, 2017CXGC0308).
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Duan, X., Yu, H., Ma, W. et al. A major and stable QTL controlling wheat thousand grain weight: identification, characterization, and CAPS marker development. Mol Breeding 40, 68 (2020). https://doi.org/10.1007/s11032-020-01147-3
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DOI: https://doi.org/10.1007/s11032-020-01147-3