Abstract
Key Message
Twelve major QTL in five optimal clusters and several epistatic QTL are identified for maize kernel size and weight, some with pleiotropic will be promising for fine-mapping and yield improvement.
Abstract
Kernel size and weight are important target traits in maize (Zea mays L.) breeding programs. Here, we report a set of quantitative trait loci (QTL) scattered through the genome and significantly controlled the performance of four kernel traits including length, width, thickness and weight. From the cross V671 (large kernel) × Mc (small kernel), 270 derived F2:3 families were used to identify QTL of maize kernel-size traits and kernel weight in five environments, using composite interval mapping (CIM) for single-environment analysis along with mixed linear model-based CIM for joint analysis. These two mapping strategies identified 55 and 28 QTL, respectively. Among them, 6 of 23 coincident were detected as interacting with environment. Single-environment analysis showed that 8 genetic regions on chromosomes 1, 2, 4, 5 and 9 clustered more than 60 % of the identified QTL. Twelve stable major QTLs accounting for over 10 % of phenotypic variation were included in five optimal clusters on the genetic region of bins 1.02–1.03, 1.04–1.06, 2.05–2.07, 4.07–4.08 and 9.03–9.04; the addition and partial dominance effects of significant QTL play an important role in controlling the development of maize kernel. These putative QTL may have great promising for further fine-mapping with more markers, and genetic improvement of maize kernel size and weight through marker-assisted breeding.
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Abbreviations
- KL:
-
20-Kernel length
- KW:
-
20-Kernel width
- KT:
-
20-Kernel thickness
- HKW:
-
100-Kernel weight
- CIM:
-
Composite interval mapping
- MCIM:
-
Mixed linear model-based composite interval mapping
- QTL:
-
Quantitative trait loci
- SSR:
-
Single sequence repeat
- MAS:
-
Marker-assisted selection
- QEI:
-
QTL × environment interaction
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Acknowledgments
This research was supported by the National Basic Research Program of China (973 Program) (2014CB138203) and the National High Technology Research and Development Program of China (863 Program) (2012AA101104), the National Nature Science Foundation of China (No. 91335205) and the Fundamental Research Funds for the Central University (No. 2013PY027).
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The authors declare that they have no conflict of interest.
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Communicated by Natalia de Leon.
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Supplementary Fig. S1 Frequency distribution of F2:3 families for maize kernel size and weight in five environments in 2011 and 2012.WH11, HG11 and ES11 represent Wuhan, Huanggang and Enshi in 2011, respectively; HG12 and ES12 represent Huanggang and Enshi in 2012, respectively. KL (20-kernel length), KW (20-kernel width) and KT (20-kernel thickness) are measured in the unit of millimeter (mm); and the unit of HKW (100-kernel weight) is gram (g).Parental trait values are indicated by arrows. Supplementary Fig. S2 Comparison between genetic (G) and physical (P) map constructed by SSR markers of each chromosome.CHR was the acronym of chromosome. Genetic coordinates are based on linkage map in this study. The physical positions are from http://www.maizegdb.org. The positions of same marker in genetic linkage map (G) and physical map (P) were connected with the brown-dashed lines. Several markers with discrepant order and position in genetic and physical map are underlined. The positions in genetic linkage map were measured in the unit of centiMorgan (cM); while the unit of marker positions in physical map was million base pairs (Mb) (PDF 633 kb)
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Liu, Y., Wang, L., Sun, C. et al. Genetic analysis and major QTL detection for maize kernel size and weight in multi-environments. Theor Appl Genet 127, 1019–1037 (2014). https://doi.org/10.1007/s00122-014-2276-0
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DOI: https://doi.org/10.1007/s00122-014-2276-0