Quantitative genetic analysis of grain yield in an Australian Brassica napus doubled-haploid population
MetadataShow full item record
High yield is a major objective in canola-breeding programs. We analysed the genetic determinants controlling variation in grain yield in a doubled-haploid (DH) breeding population derived from a single BC1F1 plant from the cross Skipton/Ag-Spectrum//Skipton (designated as theSAgSpopulation).DHlines were evaluated for flowering time and yield in two replicated trials and exhibited significant genetic variation for both traits. Yield showed negative correlation with flowering time; lines that flowered earlier had higher yield than late-flowering lines.Agenetic linkage map comprising 7716 DArTseq markers was constructed for the SAgS population, and a ‘bin’ map based on 508 discrete single-position (non-cosegregating) marker loci was used for quantitative trait locus (QTL) analysis. We identified 20 QTLs (LOD 2) associated with variation in flowering time and grain yield. Two QTLs (Qy.wwai-A7/Qdtf.wwai-A7/Qfs.wwai-A7 and Qy.wwai-C3a/ Qfs.wwai-C3a) appeared repeatedly across experiments, accounting for 4.9–19%of the genotypic variation in flowering time and yield and were located on chromosomes A07 and C03. We identified 22 putative candidate genes for flowering time as well as grain yield, and all were located in a range of 935 bp to 2.97 Mb from markers underlying QTLs. This research provides useful information to be used for breeding high-yielding canola varieties by combining favourable alleles for early flowering and higher grain yield at loci on chromosomes A07, C03 and possibly on A06.
Showing items related by title, author, creator and subject.
Hybridisation-based target enrichment of phenology genes to dissect the genetic basis of yield and adaptation in barleyHill, C.; Angessa, T.; McFawn, L.; Wong, D.; Tibbits, J.; Zhang, X.; Forrest, K.; Moody, D.; Telfer, P.; Westcott, S.; Diepeveen, Dean; Xu, Y.; Tan, C.; Hayden, M.; Li, C. (2018)Plant Biotechnology Journal published by Society for Experimental Biology and The Association of Applied Biologists and John Wiley & Sons Ltd. Barley (Hordeum vulgare L.) is a major cereal grain widely used for livestock ...
Gene-set association and epistatic analyses reveal complex gene interaction networks affecting flowering time in a worldwide barley collectionHe, Tianhua; Hill, C.; Angessa, T.; Zhang, X.; Chen, Kefei; Moody, D.; Telfer, P.; Westcott, S.; Li, C. (2019)Single-marker genome-wide association studies (GWAS) have successfully detected associations between single nucleotide polymorphisms (SNPs) and agronomic traits such as flowering time and grain yield in barley. However, ...
Adaptation of Indian mustard (Brassica juncea L.) to short season dryland Mediterranean-type environments.Gunasekera, Chandra Padmini (2003)Indian mustard (Brassica juncea L.) has recently been identified as a potential and profitable alternative oilseed crop in the grain growing regions of Australia. To date, no research has been reported on adaptation of ...