A quantitative trait locus analysis of seed production traits in perennial ryegrass (Lolium perenne L.)
DOI:
https://doi.org/10.33584/rps.12.2006.3039Abstract
A full-sib mapping population (n=188) from a cross between cultivars 'Grasslands Impact' and 'Grasslands Samson' was used to identify quantitative trait loci (QTL) controlling seed yield and component traits in perennial ryegrass. Thirteen traits, including seed yield per plant (SYP) and five seed yield components (number of spikes (SP), spikelets per spike (SS), florets per spikelet (FSP), seed weight (SW) and floret site utilisation (FSU)), seed yield per spike (SYH) and seven other seed yield-associated traits, were phenotypically assessed in a replicated spaced plant field experiment. Interval mapping identified 35 QTL for all traits but one, spanning all linkage groups (LG). Multiple QTL were detected for most traits. QTL for SYP and component traits, as well as some seed yield-associated traits, co-located to the same genomic regions on LG 1, 2 and 6. Markers associated with these regions, in particular, will form the basis for the on-going development of MAS tools for improvement of seed yield and quality in breeding programmes. Further development will require refinement of QTL positions and effects using multiple QTL mapping (MQM), and validation of QTL and associated markers in other genetic backgrounds and environments
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