Impact of Teratosphaeria nubilosa over tree growth and survival of Eucalyptus globulus and Eucalyptus maidenii in Uruguay

Balmelli, Gustavo; Simeto, Sofía; Torres, Diego; Hirigoyen, Andrés; Castillo, A.; Altier, Nora; Pérez, Guillermo Alonso Castaño

doi:10.1007/s11056-016-9547-3

Cited by 8 publications

(5 citation statements)

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“…A total of 3,853 individuals presented high-quality phenotypic records in the data set and have been used for the analysis. For a more detailed description of the progeny trial and phenotypic data, see Balmelli et al (2016).…”

Section: Breeding Population and Phenotypingmentioning

confidence: 99%

Genomic breeding values’ prediction including populational selfing rate in an open-pollinated Eucalyptus globulus breeding population

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Balmelli

2022

Tree Genetics & Genomes

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In forest tree breeding programs, open-pollinated families are frequently used to estimate genetic parameters and evaluate genetic merit of individuals. However, the presence of selfing events not documented in the pedigree affects the estimation of these parameters. In this study, 194 open-pollinated families of Eucalyptus globulus Labill. trees were used to compare the precision of estimated genetic parameters and accuracies of predicted breeding values with the conventional pedigree-based model (ABLUP) and the pedigree-genomic single-step model (ssGBLUP). The available genetic information for pairwise parent-offspring allows us to estimate an actual populational selfing rate of 5.4%. For all the growth and disease resistance traits evaluated, the inclusion of selfing rate was effective in reducing the upward bias, between 7 and 30%, in heritability estimates. The predictive abilities for ssGBLUP models were always higher than those for ABLUP models. In both cases, a considerable reduction of predictive abilities was observed when relatedness between training and validation populations was removed. We proposed a straightforward approach for the estimation of the actual selfing rate in a breeding population. The incorporation of this parameter allows for more reliable estimation of genetic parameters. Furthermore, our results proved that ssGBLUP was effective for the accurate estimation of genetic parameters and to improve the prediction of breeding values in presence of selfing events, thus a valuable tool for genomic evaluations in Eucalyptus breeding programs.

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Section: Breeding Population and Phenotypingmentioning

confidence: 99%

Genomic breeding values’ prediction including populational selfing rate in an open-pollinated Eucalyptus globulus breeding population

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Aguilar

Balmelli

2022

Tree Genetics & Genomes

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“…The experimental design was a randomized complete block design, with 3 replicates and eight-tree row plots. When the trees were ~ 1 year old, there were several consecutive days of rain and high humidity, causing a severe infection of MLD ( Balmelli et al., 2016 ). Phenotypic responses to the natural infection were assessed at age 14 (coinciding with outbreak of MLD), 21 and 26 months.…”

Section: Methodsmentioning

confidence: 99%

Single-step genome-wide association study for susceptibility to Teratosphaeria nubilosa and precocity of vegetative phase change in Eucalyptus globulus

et al. 2023

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IntroductionMycosphaerella leaf disease (MLD) is one of the most prevalent foliar diseases of Eucalyptus globulus plantations around the world. Since resistance management strategies have not been effective in commercial plantations, breeding to develop more resistant genotypes is the most promising strategy. Available genomic information can be used to detect genomic regions associated with resistance to MLD, which could significantly speed up the process of genetic improvement.MethodsWe investigated the genetic basis of MLD resistance in a breeding population of E. globulus which was genotyped with the EUChip60K SNP array. Resistance to MLD was evaluated through resistance of the juvenile foliage, as defoliation and leaf spot severity, and through precocity of change to resistant adult foliage. Genome-wide association studies (GWAS) were carried out applying four Single-SNP models, a Genomic Best Linear Unbiased Prediction (GBLUP-GWAS) approach, and a Single-step genome-wide association study (ssGWAS).ResultsThe Single-SNP (model K) and GBLUP-GWAS models detected 13 and 16 SNP-trait associations in chromosomes 2, 3 y 11; whereas the ssGWAS detected 66 SNP-trait associations in the same chromosomes, and additional significant SNP-trait associations in chromosomes 5 to 9 for the precocity of phase change (proportion of adult foliage). For this trait, the two main regions in chromosomes 3 and 11 were identified for the three approaches. The SNPs identified in these regions were positioned near the key miRNA genes, miR156.5 and miR157.4, which have a main role in the regulation of the timing of vegetative change, and also in the response to environmental stresses in plants.DiscussionOur results demonstrated that ssGWAS was more powerful in detecting regions that affect resistance than conventional GWAS approaches. Additionally, the results suggest a polygenic genetic architecture for the heteroblastic transition in E. globulus and identified useful SNP markers for the development of marker-assisted selection strategies for resistance to MLD.

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“…This study was carried out using a progeny test of When the trees were ∼ 1 year old, there were several consecutive days of rain and high humidity, causing a severe infection of MLD 29 . Phenotypic responses to the natural infection were assessed at age 14 (coinciding with outbreak of MLD), 21 and 26 months.…”

Section: Population and Phenotypic Datamentioning

confidence: 99%

Single-step genome-wide association study for susceptibility toTeratosphaeria nubilosaand precocity of vegetative phase change inEucalyptus globulus

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Giorello

Silva

et al. 2022

Preprint

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Mycosphaerella leaf disease (MLD) is one of the most prevalent foliar diseases of E. globulus plantations around the world. Since resistance management strategies have not been effective in commercial plantations, breeding to develop more resistant genotypes is the most promising strategy. Available genomic information can be used to detect genomic regions associated with resistance to MLD, which could significantly speed up the process of genetic improvement. In this study, we investigated the genetic basis of MLD resistance in a breeding population of E. globulus which was genotyped with the EUChip60K SNP array. Resistance to MLD was evaluated for resistance of the juvenile foliage, as defoliation and leaf spot severity, and for precocity of change to resistant adult foliage. Genome-wide association studies (GWAS) were carried out applying four Single-SNP models, a Genomic Best Linear Unbiased Prediction (GBLUP-GWAS) approach, and a Single step genome-wide association study (ssGWAS). The Single-SNP and GBLUP- GWAS models detected 13 and 16 SNP-trait associations in chromosomes 2, 3 y 11; whereas the ssGWAS detected 66 SNP trait associations in the same chromosomes, and additional significant SNP-trait associations in chromosomes 5 to 9 for the precocity of phase change (proportion of adult foliage). For this trait, the two main regions in chromosomes 3 and 11 were identified for the three approaches. The SNPs identified in these regions were positioned near the key miRNA genes, miR156.5 and miR157.4, which have a main role in the regulation of the timing of vegetative change, and also in the response to environmental stresses in plants. Our results outlined that ssGWAS was more powerful in detecting regions that affect resistance than conventional GWAS approaches. Additionally, suggest a polygenic genetic architecture for the heteroblastic transition in E. globulus and identified useful SNP markers for the development of marker-assisted selection strategies for resistance.

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Impact of Teratosphaeria nubilosa over tree growth and survival of Eucalyptus globulus and Eucalyptus maidenii in Uruguay

Cited by 8 publications

References 53 publications

Genomic breeding values’ prediction including populational selfing rate in an open-pollinated Eucalyptus globulus breeding population

Genomic breeding values’ prediction including populational selfing rate in an open-pollinated Eucalyptus globulus breeding population

Single-step genome-wide association study for susceptibility to Teratosphaeria nubilosa and precocity of vegetative phase change in Eucalyptus globulus

Single-step genome-wide association study for susceptibility toTeratosphaeria nubilosaand precocity of vegetative phase change inEucalyptus globulus

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