Introduction to Marker-Assisted Selection in Wheat Breeding

Pandurangan, Sudhakar; Workman, Clare; Nilsen, Kirby T.; Kumar, Santosh

doi:10.1007/978-1-0716-1526-3_3

Cited by 10 publications

(6 citation statements)

References 221 publications

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“…Dissecting the genetic bases of complex traits in crop breeding is essential to carry out molecular-based approaches to improve cultivars. Numerous attempts have been previously done to identify QTLs and marker-trait associations linked to traits of interest to achieve marker-assisted selection (MAS) approaches and the introgression of alleles of commercial interest in improved genotypes (Pandurangan et al, 2022).…”

Section: Marker Trait Associationsmentioning

confidence: 99%

Uncovering the genetic basis for quality traits in the Mediterranean old wheat germplasm and phenotypic and genomic prediction assessment by cross-validation test

Yannam

Lopes²,

Guzmán³

et al. 2023

Front. Plant Sci.

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The release of new wheat varieties is based on two main characteristics, grain yield and quality, to meet the consumer’s demand. Identifying the genetic architecture for yield and key quality traits has wide attention for genetic improvement to meet the global requirement. In this sense, the use of landraces represents an impressive source of natural allelic variation. In this study, a genome-wide association analysis (GWAS) with PCA and kinship matrix was performed to detect QTLs in bread wheat for fifteen quality and agronomic traits using 170 diverse landraces from 24 Mediterranean countries in two years of field trials. A total of 53 QTL hotspots containing 165 significant marker-trait associations (MTAs) were located across the genome for quality and agronomical traits except for chromosome 2D. The major specific QTL hotspots for quality traits were QTL_3B.3 (13 MTAs with a mean PVE of 8.2%) and QTL_4A.3 (15 MTAs, mean PVE of 11.0%), and for yield-related traits were QTL_2B.1 (8 MTAs, mean PVE of 7.4%) and QTL_4B.2 (5 MTAs, mean PVE of 10.0%). A search for candidate genes (CG) identified 807 gene models within the QTL hotspots. Ten of these CGs were expressed specifically in grain supporting the role of identified QTLs in Landraces, associated to bread wheat quality traits and grain formation. A cross-validation approach within the collection was performed to calculate the accuracies of genomic prediction for quality and agronomical traits, ranging from -0.03 to 0.64 for quality and 0.46 to 0.65 for agronomic traits. In addition, five prediction equations using the phenotypic data were developed to predict bread loaf volume in landraces. The prediction ability varied from 0.67 to 0.82 depending on the complexity of the traits considered to predict loaf volume.

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Section: Marker Trait Associationsmentioning

confidence: 99%

Uncovering the genetic basis for quality traits in the Mediterranean old wheat germplasm and phenotypic and genomic prediction assessment by cross-validation test

Yannam

Lopes²,

Guzmán³

et al. 2023

Front. Plant Sci.

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“…SNPs and flanking sequences are found by library construction and sequencing or through the screening of readily available sequence databases [102]. Genotyping methods, including DNA chips, allele-specific PCR, and primer extension approaches based on SNPs, are particularly attractive for their high data throughput and for suitability for automation [103]. They are used for a wide range of purposes, including rapid identification of crop cultivars and construction of ultra-high-density genetic maps [103,104].…”

Section: Single Nucleotide Polymorphism (Snp) Markersmentioning

confidence: 99%

“…Genotyping methods, including DNA chips, allele-specific PCR, and primer extension approaches based on SNPs, are particularly attractive for their high data throughput and for suitability for automation [103]. They are used for a wide range of purposes, including rapid identification of crop cultivars and construction of ultra-high-density genetic maps [103,104]. SNPs markers have been used in wheat in identifying resistance genes for stripe rust Yr5, leaf rust Lr16, stem rust Sr6, the waxy starch gene Wx-D, and Karnal bunt resistance among others [105][106][107].…”

Section: Single Nucleotide Polymorphism (Snp) Markersmentioning

confidence: 99%

Past, Current and Future of Wheat Diseases in Kenya

Wanyera¹,

Wamalwa²

2022

Wheat

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Wheat (Triticum aestivum L.) is an important cereal and is among the crops that contribute significantly to food security in Kenya. However, wheat diseases are among the biotic factors that affect wheat production. Considerable progress has been made to control wheat diseases through host plant resistance breeding and chemical applications. Frequent changes in the pathogens population still present a major challenge to achieving durable resistance. Disease surveillance and monitoring of the pathogens have revealed the changes in virulence across the region, justifying the need to develop and deploy more efficient and sustainable strategies to manage the diseases. Understanding the genetic variability and composition of the diseases is important for variety release with appropriate resistance gene combinations for sustainable disease management. This review highlights the prevalence, distribution of wheat diseases, host plant resistance in the key wheat-growing regions of Kenya, and future prospects in Kenya.

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“…However, since 1996 (Knight et al, 2012 ; Slater et al, 2021 ), average yields have plateaued despite a fairly recent world record of wheat yields being achieved in the UK; for example, up to 16.5 t ha −1 from one field in 2015 (Hennessy, 2016 ). The lack of significant yield gain over 25 years has coincided with a period of revolutionary technological advances, including in wheat genetic mapping and marker-assisted breeding to increase yields, and select disease resistance and quality traits (Kuchel et al, 2007 ; Dhariwal and Randhawa, 2022 ; Pandurangan et al, 2022 ). Although some modern varieties have yield potentials approaching 20 t ha −1 under optimum conditions, most UK farmers, despite achieving amongst the highest yields in the world, are typically achieving <50% of these potentials.…”

Section: Introductionmentioning

confidence: 99%

Experimental evaluation of biological regeneration of arable soil: The effects of grass-clover leys and arbuscular mycorrhizal inoculants on wheat growth, yield, and shoot pathology

et al. 2022

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Wheat yields have plateaued in the UK over the last 25 years, during which time most arable land has been annually cropped continuously with short rotations dominated by cereals. Arable intensification has depleted soil organic matter and biology, including mycorrhizas, which are affected by tillage, herbicides, and crop genotype. Here, we test whether winter wheat yields, mycorrhization, and shoot health can be improved simply by adopting less intensive tillage and adding commercial mycorrhizal inoculum to long-term arable fields, or if 3-year grass-clover leys followed direct drilling is more effective for biological regeneration of soil with reduced N fertiliser. We report a trial of mycorrhization, ear pathology, and yield performance of the parents and four double haploid lines from the Avalon x Cadenza winter wheat population in a long-term arable field that is divided into replicated treatment plots. These plots comprised wheat lines grown using ploughing or disc cultivation for 3 years, half of which received annual additions of commercial arbuscular mycorrhizal (AM) inoculum, compared to 3-year mown grass-clover ley plots treated with glyphosate and direct-drilled. All plots annually received 35 kg of N ha−1 fertiliser without fungicides. The wheat lines did not differ in mycorrhization, which averaged only 34% and 40% of root length colonised (RLC) in the ploughed and disc-cultivated plots, respectively, and decreased with inoculation. In the ley, RLC increased to 52%. Two wheat lines were very susceptible to a sooty ear mould, which was lowest in the ley, and highest with disc cultivation. AM inoculation reduced ear infections by >50% in the susceptible lines. In the ley, yields ranged from 7.2 to 8.3 t ha−1, achieving 92 to 106% of UK average wheat yield in 2018 (7.8 t ha−1) but using only 25% of average N fertiliser. Yields with ploughing and disc cultivation averaged only 3.9 and 3.4 t ha−1, respectively, with AM inoculum reducing yields from 4.3 to 3.5 t ha−1 in ploughed plots, with no effect of disc cultivation. The findings reveal multiple benefits of reintegrating legume-rich leys into arable rotations as part of a strategy to regenerate soil quality and wheat crop health, reduce dependence on nitrogen fertilisers, enhance mycorrhization, and achieve good yields.

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Introduction to Marker-Assisted Selection in Wheat Breeding

Cited by 10 publications

References 221 publications

Uncovering the genetic basis for quality traits in the Mediterranean old wheat germplasm and phenotypic and genomic prediction assessment by cross-validation test

Uncovering the genetic basis for quality traits in the Mediterranean old wheat germplasm and phenotypic and genomic prediction assessment by cross-validation test

Past, Current and Future of Wheat Diseases in Kenya

Experimental evaluation of biological regeneration of arable soil: The effects of grass-clover leys and arbuscular mycorrhizal inoculants on wheat growth, yield, and shoot pathology

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