Hidden Effects of Seed Quality Breeding on Germination in Oilseed Rape (Brassica napus L.)
2018
Hatzig, Sarah | Breuer, Frank | Nesi, Nathalie | Ducournau, Sylvie | Wagner, Marie-Helene | Leckband, Gunhild | Abbadi, Amine | Snowdon, Rod | Justus-Liebig-Universität Gießen = Justus Liebig University (JLU) | KWS SAAT SE & Co.KGaA | Institut de Génétique, Environnement et Protection des Plantes (IGEPP) ; Institut National de la Recherche Agronomique (INRA)-Université de Rennes (UR)-AGROCAMPUS OUEST | GEVES Station nationale d'essais de semences ; Institut National de la Recherche Agronomique (INRA) | NPZ Innovation GmbH | ANR-10-KBBE-0002,CONVIGOUR,Analyse de la diversité génétique contrôlant la germination et la vigueur des graines chez le colza oléagineux pour stabiliser le rendement final(2010)
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Show more [+] Less [-]English. Intense selection for specific seed qualities in winter oilseed rape breeding has had an inadvertent negative influence on seed germination performance. In a panel of 215 diverse winter oilseed rape varieties spanning over 50 years of breeding progress in winter-type rapeseed, we found that low seed erucic acid content and reduced seed glucosinolate content were significantly related with prolonged germination time. Genome-wide association mapping revealed that this relationship is caused by linkage drag between important loci for seed quality and germination traits. One QTL for mean germination time on chromosome A09 co-localized with significant but minor QTL for both seed erucic acid and seed glucosinolate content. This suggested either potential pleiotropy or close linkage of minor factors influencing all three traits. Therefore, a reduction in germination performance may be due to inadvertent co-selection of genetic variants associated with 00 seed quality that have a negative influence on germination. Our results suggest that marker-assisted selection of positive alleles for mean germination time within the modern quality pool can help breeders to maintain maximal germination capacity in new 00-quality oilseed rape cultivars.
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