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Comparative mapping of the oat Dw6/dw6 dwarfing locus using NILs and association with vacuolar proton ATPase subunit H

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Abstract

Seven pairs of oat near-isogenic lines (NILs) (Kibite in Crop Sci 41:277–278, 2001) contrasting for the Dw6 dwarfing gene were used to test for correlation between tall/dwarf phenotype and polymorphic genotype using restriction fragment length polymorphism (RFLP) and other molecular markers selected from the Kanota × Ogle (K×O) (Wight et al. in Genome 46:28–47, 2003) and Terra × Marion (De Koeyer et al. in Theor Appl Genet 108:1285–1298, 2004) recombination maps. This strategy located the Dw6/dw6 locus to a small chromosomal region on K×O linkage group (LG) KO33, near or at a putative RFLP locus aco245z. Aco245z and other tightly linked flanking markers have potential for use in marker-assisted selection (MAS), and PCR-based markers were developed from several of these. RFLP genotyping of the Dw6 NILs indicated that 13 of the 14 individual lines were homogeneously maternal or paternal for a large genomic region near Dw6/dw6, an unexpected result for NILs. The cDNA clone aco245 codes for a vacuolar proton ATPase subunit H, a potential candidate gene for Dw6. Vacuolar proton ATPase enzymes have a central role in plant growth and development and a mutation in subunit C is responsible for the det3 dwarfing mutation in Arabidopsis thaliana (Schumacher et al. in Genes Dev 13:3259–3270, 1999). Aco245 affords the potential of designing highly precise diagnostic markers for MAS for Dw6. The Dw6 NILs have potential utility to investigate the role of vacuolar proton ATPases in growth and development in plants.

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Acknowledgments

The research was made possible by generous funding from Quaker Oats (a division of Pepsico), by QTG Canada, and by the Agriculture and Agri-Food Canada Matching Investment Initiative. We thank Drs. Andrzej Kilian and Eric Huttner of Diversity Arrays Pty. Ltd. for DArT genotyping. We appreciate the encouragement of Drs. Burrows, McElroy, and Tinker, and our oat colleagues at AAFC. We also wish to thank the anonymous journal reviewers for their insightful suggestions.

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Authors and Affiliations

  1. Eastern Cereal and Oilseed Research Centre, Agriculture and Agri-Food Canada, Central Experimental Farm, 960 Carling Ave., Ottawa, ON, K1A 0C6, Canada

    Stephen J. Molnar, Julie T. Chapados, Sivakala Satheeskumar, Charlene P. Wight, Bonnie Bancroft, Winson Orr & Doris E. Luckert

  2. Lacombe Research Centre, Agriculture and Agri-Food Canada, 6000 C and E Trail, Lacombe, AB, T4L 1W1, Canada

    Solomon Kibite

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  1. Stephen J. Molnar
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  2. Julie T. Chapados
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  3. Sivakala Satheeskumar
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  4. Charlene P. Wight
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  5. Bonnie Bancroft
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  6. Winson Orr
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  7. Doris E. Luckert
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  8. Solomon Kibite
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Correspondence to Stephen J. Molnar.

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Communicated by J. Snape.

S. Kibite: Deceased.

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Molnar, S.J., Chapados, J.T., Satheeskumar, S. et al. Comparative mapping of the oat Dw6/dw6 dwarfing locus using NILs and association with vacuolar proton ATPase subunit H. Theor Appl Genet 124, 1115–1125 (2012). https://doi.org/10.1007/s00122-011-1773-7

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  • DOI: https://doi.org/10.1007/s00122-011-1773-7

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