Identification of a candidate gene for a QTL for spikelet number per spike on wheat chromosome arm 7AL by high-resolution genetic mapping
| Autor: | Max Fraser, Eduard Akhunov, Andrew Katz, Noah DeWitt, Stephen Pearce, James A. Anderson, Yunfeng Xu, Justin D. Faris, Junli Zhang, Gina Brown-Guedira, Guihua Bai, Amanda R. Peters Haugrud, Jorge Dubcovsky, Saarah Kuzay, Zhenqi Su |
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| Rok vydání: | 2019 |
| Předmět: |
0106 biological sciences
Genetic Markers Candidate gene Genotype Genetic Linkage Quantitative Trait Loci Plant Development Locus (genetics) Quantitative trait locus Biology 01 natural sciences Polymorphism Single Nucleotide Chromosomes Plant Gene mapping Genetics Allele Common wheat Triticum Plant Proteins Haplotype food and beverages Chromosome Mapping General Medicine Phenotype Haplotypes Genetic marker Original Article Agronomy and Crop Science 010606 plant biology & botany Biotechnology |
| Zdroj: | TAG. Theoretical and Applied Genetics. Theoretische Und Angewandte Genetik |
| ISSN: | 1432-2242 |
| Popis: | Key message A high-resolution genetic map combined with haplotype analyses identified a wheat ortholog of rice gene APO1 as the best candidate gene for a 7AL locus affecting spikelet number per spike. Abstract A better understanding of the genes controlling differences in wheat grain yield components can accelerate the improvements required to satisfy future food demands. In this study, we identified a promising candidate gene underlying a quantitative trait locus (QTL) on wheat chromosome arm 7AL regulating spikelet number per spike (SNS). We used large heterogeneous inbred families ( > 10,000 plants) from two crosses to map the 7AL QTL to an 87-kb region (674,019,191–674,106,327 bp, RefSeq v1.0) containing two complete and two partial genes. In this region, we found three major haplotypes that were designated as H1, H2 and H3. The H2 haplotype contributed the high-SNS allele in both H1 × H2 and H2 × H3 segregating populations. The ancestral H3 haplotype is frequent in wild emmer (48%) but rare (~ 1%) in cultivated wheats. By contrast, the H1 and H2 haplotypes became predominant in modern cultivated durum and common wheat, respectively. Among the four candidate genes, only TraesCS7A02G481600 showed a non-synonymous polymorphism that differentiated H2 from the other two haplotypes. This gene, designated here as WHEAT ORTHOLOG OF APO1 (WAPO1), is an ortholog of the rice gene ABERRANT PANICLE ORGANIZATION 1 (APO1), which affects spikelet number. Taken together, the high-resolution genetic map, the association between polymorphisms in the different mapping populations with differences in SNS, and the known role of orthologous genes in other grass species suggest that WAPO-A1 is the most likely candidate gene for the 7AL SNS QTL among the four genes identified in the candidate gene region. Electronic supplementary material The online version of this article (10.1007/s00122-019-03382-5) contains supplementary material, which is available to authorized users. |
| Databáze: | OpenAIRE |
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