Westar Summer Rape

Klassen, A. J.; Downey, R. K.; Capcara, J. J.

doi:10.4141/cjps87-068

Cited by 30 publications

(20 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In contrast, there was a remarkable negative correlation between the number of favourable allele at associated loci and the variances of EAC and GSC (Figure c,d), suggesting that EAC and GSC could be further reduced by accumulating favourable alleles, although they are both controlled by major QTLs coupled with several minor QTLs. This is consistent with the secondary domestication (Wang et al ., ), whereby ‘double‐low’ canola B. napus was selected following introgression of alleles from two well‐defined cultivar sources Liho (low EAC) and Bronowski (low GSC) (Fu and Gugel, ; Klassen et al ., ). Our results also suggest that selecting the favourable allele for each of the significant loci detected by GWAS may provide a straightforward means for breeding elite cultivars with robust lower EAC and GSC and higher SOC.…”

Section: Discussionmentioning

confidence: 97%

Dissection of the genetic architecture of three seed‐quality traits and consequences for breeding in Brassica napus

Wang

et al. 2018

Plant Biotechnology Journal

View full text Add to dashboard Cite

SummaryGenome‐wide association studies (GWASs) combining high‐throughput genome resequencing and phenotyping can accelerate the dissection of genetic architecture and identification of genes for plant complex traits. In this study, we developed a rapeseed genomic variation map consisting of 4 542 011 SNPs and 628 666 INDELs. GWAS was performed for three seed‐quality traits, including erucic acid content (EAC), glucosinolate content (GSC) and seed oil content (SOC) using 3.82 million polymorphisms in an association panel. Six, 49 and 17 loci were detected to be associated with EAC, GSC and SOC in multiple environments, respectively. The mean total contribution of these loci in each environment was 94.1% for EAC and 87.9% for GSC, notably higher than that for SOC (40.1%). A high correlation was observed between phenotypic variance and number of favourable alleles for associated loci, which will contribute to breeding improvement by pyramiding these loci. Furthermore, candidate genes were detected underlying associated loci, based on functional polymorphisms in gene regions where sequence variation was found to correlate with phenotypic variation. Our approach was validated by detection of well‐characterized FAE1 genes at each of two major loci for EAC on chromosomes A8 and C3, along with MYB28 genes at each of three major loci for GSC on chromosomes A9, C2 and C9. Four novel candidate genes were detected by correlation between GSC and SOC and observed sequence variation, respectively. This study provides insights into the genetic architecture of three seed‐quality traits, which would be useful for genetic improvement of B. napus.

show abstract

Section: Discussionmentioning

confidence: 97%

Dissection of the genetic architecture of three seed‐quality traits and consequences for breeding in Brassica napus

Wang

et al. 2018

Plant Biotechnology Journal

View full text Add to dashboard Cite

show abstract

“…Selections from backcrosses of Turret to sources of low erucic acid (Liho) and low glucosinolate (Bronowski) content culminated in the U of M releasing Tower in 1974, which heralded the beginning of canola quality (Downey et al 1975;Stefansson and Downey 1995). AAFC's first canola quality cultivar, Westar, was developed from backcross and pedigree selection involving Liho, Bronowski, and several cultivars and lines related to Argentine and released in 1982 (Klassen et al 1987). Since then, further reductions in erucic acid and glucosinolates have been made in B. napus canola cultivars by both public and private breeding programs, and more recent breeding efforts have been shifting to improve seed yield through hybridization for maximizing heterosis (Downey and Rimmer 1993).…”

mentioning

confidence: 99%

Genetic diversity of Canadian elite summer rape (Brassica napus L.) cultivars from the pre- to post-canola quality era

Fu¹,

Gugel²

2010

Can. J. Plant Sci.

View full text Add to dashboard Cite

. 2010. Genetic diversity of Canadian elite summer rape (Brassica napus L.) cultivars from the preto post-canola quality era. Can. J. Plant Sci. 90: 23Á33. The development of canola quality Brassica napus oilseed cultivars was a major achievement of Canadian public oilseed breeding programs. Simple sequence repeat (SSR) markers were applied to assess the genetic diversity of 300 plants representing one landrace introduced from Argentina in 1943, seven Canadian elite cultivars developed and released by Agriculture and Agri-Food Canada since 1954, and two European cultivars that were the source of the low erucic acid and low glucosinolate traits that define canola quality. Application of 22 SSR primer pairs from eight linkage groups detected 88 polymorphic alleles from 33 likely loci. The allelic frequencies in 300 samples ranged from 0.003 to 0.993 and averaged 0.388. The estimates of mean heterozygosity for these cultivars ranged from 0.055 to 0.203 and averaged 0.139. The most SSR variation was detected in the cultivars Argentine, Golden and Oro. A trend of decline in SSR variation was observed over the years of breeding effort. The proportion of total SSR variation residing among the cultivars was 51.4%; between high vs. low erucic acid cultivars 15% and between high vs. low glucosinolate cultivars 21.2%. Pairwise genetic differentiations among these cultivars ranged from 0.140 to 0.819 and averaged 0.500. Cluster analysis revealed that the genetic relationships of these cultivars were consistent with their known pedigrees. These findings are useful for broadening the genetic base of improved B. napus gene pools, selecting genetically diverse genotypes for hybrid combinations, and conserving summer rape germplasm. a`l'origine de la faible teneur en acide e´rucique et en glucosinolates qui de´finit la qualite´du canola. L'application de 22 paires d'amorces SSR issues de huit groupes de liaison a permis de de´tecter 88 alle`les polymorphes sur 33 locus probables. La fre´quence des alle`les dans 300 e´chantillons varie de 0,003 a`0,993, pour une moyenne de 0,388. L'he´te´rozygosite´des cultivars varie de 0,055 a`0,203, pour une moyenne de 0,139, selon les estimations. La plus forte variation des SSR a e´te´releve´e chez les cultivars argentins Golden et Oro. La variation des SSR a tendance a`s'atte´nuer au fil des ans, avec l'hybridation. La part de la variation totale des SSR qui subsiste dans les cultivars s'e´tablit a`51,4 %; elle e´tait de 15 % pour les varie´te´s a`forte et a`faible teneur en acide e´rucique et de 21,2 % pour les cultivars a`forte et a`faible teneur en glucosinolates. La diffe´renciation ge´ne´tique par paire entre cultivars varie de 0,140 a`0,819, pour une moyenne de 0,500. L'analyse typologique re´ve`le que les relations ge´ne´tiques entre cultivars sont cohe´rentes avec la ge´ne´alogie connue. Ces constatations permettront d'e´largir la base du fonds ge´ne´tique des espe`ces ame´liore´es de B. napus, de se´lectionner des ge´notypes diffe´rents en vue de cre´er de nouveaux hybrides et de p...

show abstract

“…3.2 Relevant background data 3.2.1 Choice of comparator As the spring oilseed rape variety Westar was the parental cultivar/line used in the development of GT73 oilseed rape, Westar was chosen as the non-modified cultivar in all studies for comparison (Klassen et al, 1987). The heterozygosity of the plant population that constitutes the cultivar Westar was estimated by Agriculture Canada to be in the range of 10-15%.…”

Section: Issues Raised By the Member Statesmentioning

confidence: 99%

Opinion of the Scientific Panel on genetically modified organisms [GMO] on a request from the Commission related to the Notification (Reference C/NL/98/11) for the placing on the market of herbicide-tolerant oilseed rape GT73, for import and processing, u

2004

EFSA Journal

View full text Add to dashboard Cite

Westar Summer Rape

Cited by 30 publications

References 0 publications

Dissection of the genetic architecture of three seed‐quality traits and consequences for breeding in Brassica napus

Dissection of the genetic architecture of three seed‐quality traits and consequences for breeding in Brassica napus

Genetic diversity of Canadian elite summer rape (Brassica napus L.) cultivars from the pre- to post-canola quality era

Opinion of the Scientific Panel on genetically modified organisms [GMO] on a request from the Commission related to the Notification (Reference C/NL/98/11) for the placing on the market of herbicide-tolerant oilseed rape GT73, for import and processing, u

Contact Info

Product

Resources

About