Genetic growth parameters and morphological traits of canker-resistant cypress clones selected for timber production

Nocetti, Michela; Rocca, Gianni Della; Berti, Stefano; Brunetti, Michele; Lonardo, V. Di; Danti, Roberto

doi:10.1007/s11295-015-0900-z

Cited by 9 publications

(7 citation statements)

References 13 publications

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“…Moya et al (2014) mentioned that heartwood formation is affected by variables such as DBH, age of the tree and total tree height. On the other hand, studies by Pâques and Charpentier (2015), Nocetti et al (2015) and Kennedy et al (2014) found that SWT varies slightly, and this variable is little affected by tree morphology (height or diameter), growing conditions or types of wood. Based on this theory, the authors expect that through statistical methods, it is possible to estimate the heartwood parameters at a specific height, considering SWT, diameter at a specific height and age of the tree.…”

Section: Introductionmentioning

confidence: 93%

Heartwood formation and prediction of heartwood parameters in Tectona grandis L.f. trees growing in forest plantations in Costa Rica

Fernández-Sólis

Berrocal

Moya³

2018

Bois for. trop.

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La présente étude vise à établir les variations du duramen (pourcentage, diamètre, rayon, volume) rapportées à la hauteur des arbres et à l’épaisseur de l’aubier, ainsi que l’âge de début de formation du duramen et sa hauteur maximale pour les arbres de l’essence Tectona grandis. Les résultats de l’échantillonnage de seize plantations réparties dans différentes zones du Costa Rica, âgées de 2 à 22 ans, montrent que l’aubier est plus épais entre 2 et 10 ans d’âge qu’entre 10 et 22 ans. La formation du duramen commence à la base des arbres âgés de 2 à 3 ans, mais il n’apparaît à hauteur de poitrine qu’à partir de 3 à 4 ans. Le duramen disparaît à une hauteur allant de 0 à 90 % de la hauteur totale selon l’âge de l’arbre. Enfin, des modèles statistiques prédictifs ont été développés pour l’épaisseur de l’aubier et pour le rayon, la hauteur maximale et le pourcentage du duramen, en se basant sur le modèle Y = K0 + K1*(épaisseur de l’aubier) + K2*(hauteur relative de l’échantillonnage) + K3*(diamètre à hauteur de poitrine) + K4*(âge de l’arbre). Ces modèles indiquent des coefficients de détermination de 70 %, 90 %, 95 %, 73 % et 31 %, respectivement.

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Section: Introductionmentioning

confidence: 93%

Heartwood formation and prediction of heartwood parameters in Tectona grandis L.f. trees growing in forest plantations in Costa Rica

Fernández-Sólis

Berrocal

Moya³

2018

Bois for. trop.

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“…The development of canker resistant genotypes with durable performance requires a solid knowledge of the variability of the host reaction against pathogen and the variations in the virulence among the different pathogen strains. That requires the artificial inoculations of seedlings with isolates of both populations of fungi responsible for cypress canker (i.e., S. cardinale and S. cupressi), and monitoring their response for 3-5 years, until cankers heals completely (Danti et al, 2006(Danti et al, , 2013bNocetti et al, 2015), which allow to confirm the response of plants to both species of Seiridium and to examine whether the genotypes that are resistant to one are resistant to the other and vice versa. The procedure should be applied under wide range of environments to confirm the stability of canker resistance under different climatic conditions.…”

Section: Spatial Variationmentioning

confidence: 99%

Genetic Variation for Economically Important Traits in Cupressus lusitanica in New Zealand

et al. 2021

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Increasing productivity and tolerance against cypress canker disease is an important goal in the Mexican white cypress breeding program in New Zealand, and screening has been in place since 1983. Cypress canker disease is caused by Seiridium cardinale and Seiridium cupressi, the current study presents the results of two progeny trials within the breeding program in the North Island of New Zealand. The trials were established as open-pollinated progeny tested and were assessed for diameter at breast height, branch size, canker severity score, malformation score, and stem straightness score and acceptability score. Heritability estimates were moderate ranging from 0.21 to 0.41 for diameter at breast height and from 0.14 to 0.31 for canker severity score. Stem form attributes showed heritability from 0.08 (malformation) to 0.38 (straightness). No trait showed any significant G × E interaction between investigated sites. This was supported by the very strong genetic correlations estimated between the traits recorded in Welcome Bay and Matata trials. Unfavourable genetic correlations ranging from 0.25 to 0.46 were found between diameter at breast height and canker severity score, indicating that the continued selection for genotypes with improved diameter at breast height would also increase susceptibility to cypress canker. Additionally, unfavourable genetic correlations ranging from 0.52 to 0.73 were found between branch size and diameter at breast height and should be considered in selection programs. The moderate heritability estimated for canker severity score indicates that breeding values for this trait could be predicted with acceptable accuracy and included in the breeding program for Cupressus lusitanica, enabling the identification of genotypes with tolerance to canker severity to be deployed to locations where cypress canker is present in New Zealand.

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“…For quantitative genetic analysis of clonally replicated genotypes, we used random effects (or variance component) models to analyse trait phenotypic variation across genotypes. As the error term of this model provided a measure of environmental (i.e., within-genotype) variation, this model structure could hence be used to partition phenotypic variation into its genetic and environmental components (Hill, 2010;Nocetti et al, 2015). Accordingly, random-effects models were fitted for each trait by restricted maximum likelihood (REML) and used to predict total genetic values for genotypes based on best linear unbiased predictors (BLUPs) (Piepho, Moehring, Melchinger, & Buechse, 2008).…”

Section: Genetic Evaluationmentioning

confidence: 99%

Capturing genetic variation in crop wild relatives: An evolutionary approach

Egan

Muola

Stenberg

2018

Evolutionary Applications

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Crop wild relatives (CWRs) offer novel genetic resources for crop improvement. To assist in the urgent need to collect and conserve CWR germplasm, we advance here the concept of an “evolutionary” approach. Central to this approach is the predictive use of spatial proxies of evolutionary processes (natural selection, gene flow and genetic drift) to locate and capture genetic variation. As a means to help validate this concept, we screened wild‐collected genotypes of woodland strawberry (Fragaria vesca) in a common garden. A quantitative genetic approach was then used to test the ability of two such proxies—mesoclimatic variation (a proxy of natural selection) and landscape isolation and geographic distance between populations (proxies of gene flow potential)—to predict spatial genetic variation in three quantitative traits (plant size, early season flower number and flower frost tolerance). Our results indicated a significant but variable effect of mesoclimatic conditions in structuring genetic variation in the wild, in addition to other undetermined regional scale processes. As a proxy of gene flow potential, landscape isolation was also a likely determinant of observed patterns—as opposed to, and regardless of, geographic distance between populations. We conclude that harnessing proxies of adaptive and nonadaptive evolutionary processes could provide a robust and valuable means to identify genetic variation in CWRs. We thus advocate wider use and development of this approach amongst researchers, breeders and practitioners, to expedite the capture and in situ conservation of genetic resources provided by crop wild relatives.

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Genetic growth parameters and morphological traits of canker-resistant cypress clones selected for timber production

Cited by 9 publications

References 13 publications

Heartwood formation and prediction of heartwood parameters in Tectona grandis L.f. trees growing in forest plantations in Costa Rica

Heartwood formation and prediction of heartwood parameters in Tectona grandis L.f. trees growing in forest plantations in Costa Rica

Genetic Variation for Economically Important Traits in Cupressus lusitanica in New Zealand

Capturing genetic variation in crop wild relatives: An evolutionary approach

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