Molecular mapping of genomic regions underlying barley yellow dwarf tolerance in cultivated oat (Avena sativa L.)

Zhu, Shushuai; Kolb, F. L.; Kaeppler, Heidi F.

doi:10.1007/s00122-003-1198-z

Cited by 20 publications

(5 citation statements)

References 24 publications

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“…A broad and continuous distribution was observed for BYDV tolerance across the panel and is in agreement with previous work that shows host plant tolerance for BYDV is multigenic [ 24 – 26 , 46 ]. High heritabilities were observed which is consistent with recently observed heritability [ 27 ] but is higher than historical observations [ 25 ].…”

Section: Discussionsupporting

confidence: 90%

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Genome-Wide Association Mapping of Barley Yellow Dwarf Virus Tolerance in Spring Oat (Avena sativa L.)

et al. 2016

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Barley yellow dwarf viruses (BYDVs) are responsible for the disease barley yellow dwarf (BYD) and affect many cereals including oat (Avena sativa L.). Until recently, the molecular marker technology in oat has not allowed for many marker-trait association studies to determine the genetic mechanisms for tolerance. A genome-wide association study (GWAS) was performed on 428 spring oat lines using a recently developed high-density oat single nucleotide polymorphism (SNP) array as well as a SNP-based consensus map. Marker-trait associations were performed using a Q-K mixed model approach to control for population structure and relatedness. Six significant SNP-trait associations representing two QTL were found on chromosomes 3C (Mrg17) and 18D (Mrg04). This is the first report of BYDV tolerance QTL on chromosome 3C (Mrg17) and 18D (Mrg04). Haplotypes using the two QTL were evaluated and distinct classes for tolerance were identified based on the number of favorable alleles. A large number of lines carrying both favorable alleles were observed in the panel.

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Section: Discussionsupporting

confidence: 90%

“…It is believed that two to four genes are responsible for BYDV tolerance in oats [ 24 ]. Four QTL (BYDq1, BYDq2, BYDq3 and BYDq4) for BYD tolerance were identified [ 25 ] and were found on linkage groups OM1, 5, 7 and 24. Several other chromosomal regions with BYDV tolerance QTL have been identified in other studies.…”

Section: Introductionmentioning

confidence: 99%

Genome-Wide Association Mapping of Barley Yellow Dwarf Virus Tolerance in Spring Oat (Avena sativa L.)

et al. 2016

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“…The studies by Jin et al (1998) and Barbosa-Neto et al (2000) respectively identified a further 20 and 5 chromosomal regions with linkage to BYD tolerance, and additional loci were identified by Zhu et al (2003) . Inability of the present study to map more than one locus and detection under only one environment may be related to the natural BYD infection used in phenotyping.…”

Section: Discussionmentioning

confidence: 98%

Population Structure and Genotype–Phenotype Associations in a Collection of Oat Landraces and Historic Cultivars

et al. 2016

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Population structure and genetic architecture of phenotypic traits in oat (Avena sativa L.) remain relatively under-researched compared to other small grain species. This study explores the historic context of current elite germplasm, including phenotypic and genetic characterization, with a particular focus on identifying under-utilized areas. A diverse panel of cultivated oat accessions was assembled from the USDA National Small Grains Collection to represent a gene pool relatively unaffected by twentieth century breeding activity and unlikely to have been included in recent molecular studies. The panel was genotyped using an oat iSelect 6K beadchip SNP array. The final dataset included 759 unique individuals and 2,715 polymorphic markers. Some population structure was apparent, with the first three principal components accounting for 38.8% of variation and 73% of individuals belonging to one of three clusters. One cluster with high genetic distinctness appears to have been largely overlooked in twentieth century breeding. Classification and phenotype data provided by the Germplasm Resources Information Network were evaluated for their relationship to population structure. Of the structuring variables evaluated, improvement status (cultivar or landrace) was relatively unimportant, indicating that landraces and cultivars included in the panel were all sampled from a similar underlying population. Instead, lemma color and region of origin showed the strongest explanatory power. An exploratory association mapping study of the panel using a subset of 2,588 mapped markers generated novel indications of genomic regions associated with awn frequency, kernels per spikelet, lemma color, and panicle type. Further results supported previous findings of loci associated with barley yellow dwarf virus tolerance, crown rust (caused by Puccinia coronata f. sp. avenae) resistance, days to anthesis, and growth habit (winter/spring). In addition, two novel loci were identified for crown rust resistance.

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“…Because this is against the common concept of tolerance used by both pathologists and evolutionary biologists, we will not further discuss these works. QTLs for tolerance have been identified in several plant-pathogen interactions (e.g., [ 87 , 88 , 89 , 102 , 103 ]). Interestingly, a common conclusion of these works is that a few genes determine tolerance, although their functions have not been characterized.…”

Section: Mechanistic Basis and Genetic Determinants Of Plant Tolermentioning

confidence: 99%

Tolerance to Plant Pathogens: Theory and Experimental Evidence

Pagán

García‐Arenal

2018

IJMS

111

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The two major mechanisms of plant defense against pathogens are resistance (the host’s ability to limit pathogen multiplication) and tolerance (the host’s ability to reduce the effect of infection on its fitness regardless of the level of pathogen multiplication). There is abundant literature on virtually every aspect of plant resistance to pathogens. Although tolerance to plant pathogens is comparatively less understood, studies on this plant defense strategy have led to major insights into its evolution, mechanistic basis and genetic determinants. This review aims at summarizing current theories and experimental evidence on the evolutionary causes and consequences of plant tolerance to pathogens, as well as the existing knowledge on the genetic determinants and mechanisms of tolerance. Our review reveals that (i) in plant-pathogen systems, resistance and tolerance generally coexist, i.e., are not mutually exclusive; (ii) evidence of tolerance polymorphisms is abundant regardless of the pathogen considered; (iii) tolerance is an efficient strategy to reduce the damage on the infected host; and (iv) there is no evidence that tolerance results in increased pathogen multiplication. Taken together, the work discussed in this review indicates that tolerance may be as important as resistance in determining the dynamics of plant-pathogen interactions. Several aspects of plant tolerance to pathogens that still remain unclear and which should be explored in the future, are also outlined.

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Molecular mapping of genomic regions underlying barley yellow dwarf tolerance in cultivated oat (Avena sativa L.)

Cited by 20 publications

References 24 publications

Genome-Wide Association Mapping of Barley Yellow Dwarf Virus Tolerance in Spring Oat (Avena sativa L.)

Genome-Wide Association Mapping of Barley Yellow Dwarf Virus Tolerance in Spring Oat (Avena sativa L.)

Population Structure and Genotype–Phenotype Associations in a Collection of Oat Landraces and Historic Cultivars

Tolerance to Plant Pathogens: Theory and Experimental Evidence

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