Quantitative trait loci mapping for biomass yield traits in a Lolium inbred line derived F2 population
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Lolium perenne L. (perennial ryegrass) is the principle forage grass species in temperate agriculture. Improving biomass yield still remains one of the most important aims of current forage breeding programmes. A quantitative trait locus (QTL) study investigating biomass yield traits in perennial ryegrass was carried out in greenhouse and field environments. The study is based on an F2 population consisting of 360 individuals derived from two inbred grandparents where the F1 has a large biomass yield phenotype. For both experimental environments co-localized QTL for biomass yield traits including fresh and dry weight and dry matter were identified on linkage groups 2, 3 and 7. A major QTL for fresh and dry weight was identified on LG 3 which explained around 30% of the phenotypic variance in the field experiment. The findings of this study are discussed with regard for their potential in research and breeding.
KeywordsLolium perenne Perennial ryegrass Biomass QTL Fresh weight Dry weight
UCMA was financed by a Teagasc PhD Walsh Fellowship. The project was financed in part by the National Development Plan and by Teagasc core funding. We are grateful to several summer students, to the forage breeding group and the farm staff in Oak Park for help with field maintenance.
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