Premium
Quantitative trait locus analysis of seed germination, seedling vigour and seedling‐regulated hormones in Brassica napus
Author(s) -
Nguyen Tung C. T.,
Abrams Suzanne R.,
Friedt Wolfgang,
Snowdon Rod J.
Publication year - 2018
Publication title -
plant breeding
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.583
H-Index - 71
eISSN - 1439-0523
pISSN - 0179-9541
DOI - 10.1111/pbr.12576
Subject(s) - seedling , biology , quantitative trait locus , germination , brassica , agronomy , cultivar , horticulture , genetics , gene
Abstract Good germination and seedling vigour are major breeding targets in winter oilseed rape ( Brassica napus ), because seedling vigour and prewinter crop establishment are closely associated with postwinter growth and yield. Here, we identified quantitative trait loci ( QTL ) related to germination, seedling vigour and seedling‐regulated hormones in a doubled haploid ( DH ) mapping population from a cross between winter oilseed rape parents with high vigour (Express 617) and low vigour (1012‐98). By phenotyping in a climate‐controlled glasshouse, we identified a total of 13 QTL on nine chromosomes for germination and seedling‐related traits at 7 and 14 days after sowing ( DAS ), explaining up to 11.2% of the phenotypic variation for seedling vigour. Forty‐seven metabolic QTL on 15 chromosomes were identified for auxin, abscisic acid ( ABA ) and dihydrophaseic acid ( DPA ) at 5 and 12 DAS , explaining up to 49.4% of phenotypic variation in seedling hormone composition. Multitrait QTL hot spots contribute to our understanding of the genetics and metabolomics of germination and seeding vigour in B. napus , and represent potential targets to breed high‐vigour cultivars.