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Identification of QTL for crop timing and quality traits in an interspecific Petunia population

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Abstract

Genetic mapping in ornamental plant species has lagged behind crop plants from other sectors of agriculture. Here, we describe the generation of a genetic linkage map for the important herbaceous ornamental crop petunia and the identification of QTL for several key crop timing and quality traits, including plant development rate, days to flower and flower number. An F2 population derived from a cross between the progenitor species of cultivated petunia, P. integrifolia × P. axillaris, exhibited transgressive segregation for a broad panel of crop timing and quality traits. A genetic linkage map comprised of 75 simple sequence repeat and six cleaved amplified polymorphic sequence markers spanning 359.1 cM across seven linkage groups was developed and utilized to identify 24 QTL for ten crop timing and quality traits. These included QTL explaining 26.3, 25.9, 26.2 and 43 % of the observed phenotypic variation for flower length, branch number, internode length and the number of flower buds on the primary shoot, respectively. These data provide a foundation for understanding the genetic control of critical traits and identify molecular markers with potential utility to facilitate gene discovery in petunia.

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Acknowledgments

We thank Mike Olrich for technical assistance. This research was supported by the US Dept. of Agriculture (USDA) Specialty Crop Block Grant Program and the USDA Specialty Crop Research Initiative (award 2011-01508). R. M .W. and C. S. B. are supported in part by Michigan AgBioResearch and through USDA National Institute of Food and Agriculture, Hatch project numbers MICL02121 and MICL02265.

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Authors and Affiliations

  1. Department of Horticulture, Michigan State University, East Lansing, MI, 48824, USA

    Veronica A. Vallejo, Joseph Tychonievich, Wei-Kuang Lin, Lobsang Wangchu, Cornelius S. Barry & Ryan M. Warner

  2. College of Horticulture and Forestry, CAU, Pasighat, 791102, Arunachal Pradesh, India

    Lobsang Wangchu

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  1. Veronica A. Vallejo
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  2. Joseph Tychonievich
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  3. Wei-Kuang Lin
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  4. Lobsang Wangchu
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  5. Cornelius S. Barry
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  6. Ryan M. Warner
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Correspondence to Ryan M. Warner.

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Vallejo, V.A., Tychonievich, J., Lin, WK. et al. Identification of QTL for crop timing and quality traits in an interspecific Petunia population. Mol Breeding 35, 2 (2015). https://doi.org/10.1007/s11032-015-0218-4

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