Identification of quantitative trait loci for seed traits and floral morphology in a field-grown Lolium perenne × Lolium multiflorum mapping population |
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| Authors: | R N Brown R E Barker S E Warnke L D Cooper L A Brilman M A Rouf Mian G Jung and S-C Sim |
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| Institution: | National Forage Seed Production Research Center, USDA-ARS, Corvallis, OR 97331, USA;;Seed Research Oregon, 27630 Llewellyn Rd., Corvallis, OR 97333, USA;;The Samuel Roberts Noble Foundation, Ardmore, OK, USA;;Department of Plant Pathology, University of Wisconsin, Madison, WI, USA;;Present address: Department of Plant Sciences, University of Rhode Island, Kingston, RI 02881, USA;;Present address: Grass Genomic Testing, Inc., Salem, OR 97302, USA;;Present address: Floral and Nursery Plants Research Unit, USDA-ARS, Beltsville, MD 20705, USA;;Present address: USDA-ARS, Wooster, OH 44691, USA;;Present address: The Ohio State University, OARDC 1680 Madison Ave. Wooster, OH 44691, USA;;Present address: Department of Plant, Soil and Insect Sciences, University of Massachusetts, Amherst, MA 01003, USA;;Present address: Department of Crop and Soil Sciences, Oregon State University, Corvallis, OR 97331, USA;;Corresponding author, E-mail: |
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| Abstract: | Lolium perenne L. (perennial ryegrass), and Lolium multiflorum Lam. (annual or Italian ryegrass), differ in several traits related to seed yield. Generally, L. multiflorum spikes are larger than L. perenne spikes, and have more spikelets, more florets per spikelet, larger seeds and awns. The greater number of spikelets and florets and larger seeds are associated with higher seed yield in L. multiflorum . Ryegrass ( Lolium sp.) cultivars are produced by seed multiplication and understanding the genetics of seed production traits would aid in plant improvement. A total of 30 QTL for seed production related traits were identified in this study. The QTLs were primarily located on linkage groups 2 and 4 which appear to be the most important for distinguishing L. multiflorum and L. perenne . These QTL will be used to develop molecular markers for marker-assisted breeding and screening of L. perenne seed lots to detect seed contamination with L. multiflorum . |
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| Keywords: | floral morphology genetic map Lolium QTL seed production |
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