Linkage mapping and whole-genome predictions in canola (Brassica napus) subjected to differing temperature treatments

Koscielny, C. B.; Gardner, Stuart W.; Technow, Frank; Duncan, Robert

doi:10.1071/cp19387

Cited by 3 publications

(3 citation statements)

References 53 publications

(64 reference statements)

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“…The inclusion of genotype-by-environment interaction in the GBLUP model resulted in further, though slight, improvements in predictions. Koscielny et al ( 2020 ) confirmed these findings, demonstrating higher accuracy in whole-genome predictions within the stress treatment than within the control treatment for the majority of traits evaluated. It is therefore important, even in the genomics era, to link selected phenotypic or demographic models with the underlying processes of genomic variation.…”

Section: Genomic Selection In Crop Improvementmentioning

confidence: 76%

Genomics Armed With Diversity Leads the Way in Brassica Improvement in a Changing Global Environment

et al. 2021

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Meeting the needs of a growing world population in the face of imminent climate change is a challenge; breeding of vegetable and oilseed Brassica crops is part of the race in meeting these demands. Available genetic diversity constituting the foundation of breeding is essential in plant improvement. Elite varieties, land races, and crop wild species are important resources of useful variation and are available from existing genepools or genebanks. Conservation of diversity in genepools, genebanks, and even the wild is crucial in preventing the loss of variation for future breeding efforts. In addition, the identification of suitable parental lines and alleles is critical in ensuring the development of resilient Brassica crops. During the past two decades, an increasing number of high-quality nuclear and organellar Brassica genomes have been assembled. Whole-genome re-sequencing and the development of pan-genomes are overcoming the limitations of the single reference genome and provide the basis for further exploration. Genomic and complementary omic tools such as microarrays, transcriptomics, epigenetics, and reverse genetics facilitate the study of crop evolution, breeding histories, and the discovery of loci associated with highly sought-after agronomic traits. Furthermore, in genomic selection, predicted breeding values based on phenotype and genome-wide marker scores allow the preselection of promising genotypes, enhancing genetic gains and substantially quickening the breeding cycle. It is clear that genomics, armed with diversity, is set to lead the way in Brassica improvement; however, a multidisciplinary plant breeding approach that includes phenotype = genotype × environment × management interaction will ultimately ensure the selection of resilient Brassica varieties ready for climate change.

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Section: Genomic Selection In Crop Improvementmentioning

confidence: 76%

Genomics Armed With Diversity Leads the Way in Brassica Improvement in a Changing Global Environment

et al. 2021

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“…Even a short period of high temperature stress at flowering can have a negative impact on seed quality parameters. However, the heat sensitivity of canola has been reported at 29.5 °C, 30 °C, 35 °C, and 31 °C 24 – 26 . These studies have reported a yield loss in canola due to high temperature stress at sensitive crop stages causing a decrease of 15–20% 27 , 55% 26 , and 38% 1 .…”

Section: Introductionmentioning

confidence: 99%

“…However, the heat sensitivity of canola has been reported at 29.5 °C, 30 °C, 35 °C, and 31 °C 24 – 26 . These studies have reported a yield loss in canola due to high temperature stress at sensitive crop stages causing a decrease of 15–20% 27 , 55% 26 , and 38% 1 . High temperature stress generally affects the quantity and quality of canola 28 .…”

Section: Introductionmentioning

confidence: 99%

Thiourea improves yield and quality traits of Brassica napus L. by upregulating the antioxidant defense system under high temperature stress

Ahmad,

Waraich,

Zulfiqar

et al. 2024

Sci Rep

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High temperature stress influences plant growth, seed yield, and fatty acid contents by causing oxidative damage. This study investigated the potential of thiourea (TU) to mitigate oxidative stress and restoring seed oil content and quality in canola. The study thoroughly examined three main factors: (i) growth conditions—control and high temperature stress (35 °C); (ii) TU supplementation (1000 mg/L)—including variations like having no TU, water application at the seedling stage, TU application at seedling stage (BBCH Scale-39), water spray at anthesis stage, and TU application at anthesis stage (BBCH Scale-60); (iii) and two canola genotypes, 45S42 and Hiola-401, were studied separately. High temperature stress reduced growth and tissue water content, as plant height and relative water contents were decreased by 26 and 36% in 45S42 and 27 and 42% Hiola-401, respectively, resulting in a substantial decrease in seed yield per plant by 36 and 38% in 45S42 and Hiola-401. Seed oil content and quality parameters were also negatively affected by high temperature stress as seed oil content was reduced by 32 and 35% in 45S42 and Hiola-401. High-temperature stress increased the plant stress indicators like malondialdehyde, H2O2 content, and electrolyte leakage; these indicators were increased in both canola genotypes as compared to control. Interestingly, TU supplementation restored plant performance, enhancing height, relative water content, foliar chlorophyll (SPAD value), and seed yield per plant by 21, 15, 30, and 28% in 45S42; 19, 13, 26, and 21% in Hiola-401, respectively, under high temperature stress as compared to control. In addition, seed quality, seed oil content, linoleic acid, and linolenic acid were improved by 16, 14, and 22% in 45S42, and 16, 11, and 23% in Hiola-401, as compared to control. The most significant improvements in canola seed yield per plant were observed when TU was applied at the anthesis stage. Additionally, the research highlighted that canola genotype 45S42 responded better to TU applications and exhibited greater resilience against high temperature stress compared to genotype Hiola-401. This interesting study revealed that TU supplementation, particularly at the anthesis stage, improved high temperature stress tolerance, seed oil content, and fatty acid profile in two canola genotypes.

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Exploring the gene pool ofBrassica napusby genomics‐based approaches

Jing

Snowdon

et al. 2021

Plant Biotechnology Journal

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Summary De novo allopolyploidization in Brassica provides a very successful model for reconstructing polyploid genomes using progenitor species and relatives to broaden crop gene pools and understand genome evolution after polyploidy, interspecific hybridization and exotic introgression. B. napus (AACC), the major cultivated rapeseed species and the third largest oilseed crop in the world, is a young Brassica species with a limited genetic base resulting from its short history of domestication, cultivation, and intensive selection during breeding for target economic traits. However, the gene pool of B. napus has been significantly enriched in recent decades that has been benefit from worldwide effects by the successful introduction of abundant subgenomic variation and novel genomic variation via intraspecific, interspecific and intergeneric crosses. An important question in this respect is how to utilize such variation to breed crops adapted to the changing global climate. Here, we review the genetic diversity, genome structure, and population‐level differentiation of the B. napus gene pool in relation to known exotic introgressions from various species of the Brassicaceae, especially those elucidated by recent genome‐sequencing projects. We also summarize progress in gene cloning, trait‐marker associations, gene editing, molecular marker‐assisted selection and genome‐wide prediction, and describe the challenges and opportunities of these techniques as molecular platforms to exploit novel genomic variation and their value in the rapeseed gene pool. Future progress will accelerate the creation and manipulation of genetic diversity with genomic‐based improvement, as well as provide novel insights into the neo‐domestication of polyploid crops with novel genetic diversity from reconstructed genomes.

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Linkage mapping and whole-genome predictions in canola (Brassica napus) subjected to differing temperature treatments

Cited by 3 publications

References 53 publications

Genomics Armed With Diversity Leads the Way in Brassica Improvement in a Changing Global Environment

Genomics Armed With Diversity Leads the Way in Brassica Improvement in a Changing Global Environment

Thiourea improves yield and quality traits of Brassica napus L. by upregulating the antioxidant defense system under high temperature stress

Exploring the gene pool ofBrassica napusby genomics‐based approaches

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