Estimates of genetic parameters of wood traits for sawn timber production in Eucalyptus grandis

Santos, P. E. T. dos; Geraldi, Isaias Olívio; Garcia, José Nivaldo

doi:10.1590/s1415-47572004000400017

Cited by 30 publications

(17 citation statements)

References 12 publications

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“…Genetic variation in wood density due to provenances and/or families has also been reported in other tropical hardwood species at relatively young ages (e.g., Arnold et al, 2004;Dvorak et al, 1998;Lauridsen and Kjaer, 2002;Miranda et al, 2001;Santos et al, 2004;Sotelo Montes et al, 2006;Weber and Sotelo Montes, 2008).…”

Section: Variation Clines and Correlations In Wood Densitymentioning

confidence: 71%

Genetic variation in wood density and correlations with tree growth in Prosopis africana from Burkina Faso and Niger

Montes¹,

Weber²

2009

Ann. For. Sci.

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Abstract• Variation in wood basic density and its correlation with tree growth were investigated at 13 years in a provenance/progeny test of Prosopis africana in Niger. The test included progeny from 256 trees sampled from 24 provenances in the Sahelian ecozone of Burkina Faso and Niger.• Variation in wood density was significant due to provenances and families within provenances. Individual tree heritability was higher for wood density than for growth traits. Provenance means for wood density increased from the more humid to the drier parts of the sample region. Phenotypic correlations indicated that larger trees tended to have denser wood.• Clines suggest that natural populations of P. africana from the drier parts of the sample region have the genetic capacity to produce denser wood, compared with populations from the more humid parts of the region. Correlations and heritability estimates suggest that selection of faster-growing trees may produce a small gain in wood volume but little (if any) gain in density in the subsequent generation. Multi-location provenance/tests are needed to confirm this tentative conclusion. Mots-clés :Sahel / adaptation / conservation / amélioration des arbres Résumé -Variation génétique de la densité du bois et corrélations avec la croissance de l'arbre chez Prosopis africana provenant du Burkina Faso et du Niger.• La variation de la densité du bois et sa corrélation avec la croissance de l'arbre ont été étudiées à l'âge de 13 ans dans un essai de provenances/descendances de Prosopis africana au Niger. L'essai a inclus les descendances de 256 arbres mères provenant de 24 provenances de l'écozone sahélienne du Burkina Faso et du Niger.• La variation de la densité du bois a été significative en relation avec les provenances et les familles à l'intérieur des provenances. L'héritabilité a été plus élevée pour la densité que pour les caractères de croissance de l'arbre. La densité moyenne des provenances a augmenté des sites les plus humides aux sites les plus secs de la région échantillonnée. Les corrélations phénotypiques ont montré que les plus grands arbres ont eu tendance à avoir le bois le plus dense.• Les clines suggèrent que les populations naturelles de P. africana des sites les plus secs de la région échantillonnée ont la capacité génétique de produire du bois plus dense que les populations des sites les plus humides de la région. Les corrélations et les héritabilités estimées suggèrent que la sélection d'arbres à croissance rapide peut produire un faible gain en volume de bois et très peu de gain en densité du bois dans la génération suivante. Des essais de provenance/descendance dans plusieurs sites sont nécessaires pour confirmer cette conclusion provisoire.

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Section: Variation Clines and Correlations In Wood Densitymentioning

confidence: 71%

Genetic variation in wood density and correlations with tree growth in Prosopis africana from Burkina Faso and Niger

Montes¹,

Weber²

2009

Ann. For. Sci.

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“…Essas plantações têm sido ampliadas em muitos países, pela excelência das propriedades de sua madeira na fabricação de papel, particularmente papel para impressão (ROCHA et al, 2004), e pelo rápido crescimento das árvores. Esse sucesso é reflexo, em grande parte, da adaptabilidade do gênero a uma variedade de condições edafoclimáticas, crescimento rápido e versatilidade da utilidade de sua madeira para aplicações industriais (SANTOS et al, 2004).…”

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ESTIMATIVAS DE PARÂMETROS GENÉTICOS PARA CARACTERES QUANTITATIVOS EM PROGÊNIES DE POLINIZAÇÃO ABERTA DE Eucalyptus urophylla

Souza¹,

Freitas²,

Moraes³

et al. 2011

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ResumoEucalyptus urophylla S. T. Blake destaca-se pelo potencial de utilização de sua madeira, plasticidade de adaptação a diferentes condições ambientais e por ser tolerante ao cancro. Entretanto, o melhoramento genético da espécie no Brasil depende da existência de variabilidade genética nas populações introduzidas. O objetivo deste estudo foi investigar a variação genética e estimar ganhos na seleção para caracteres quantitativos de uma população base de E. urophylla instalada em 1992 em Selvíria (MS). O teste de progênies foi instalado no delineamento experimental em Látice 8 x 8, quíntuplo, parcialmente balanceado, com 64 progênies provenientes da Estação Experimental de Anhembi (IPEF/ESALQ/USP). As parcelas continham oito árvores, no espaçamento de 3 x 3 m. Foram detectadas variações genéticas entre progênies para diâmetro à altura do peito (DAP), tipo de casca, forma e sobrevivência. As estimativas de herdabilidade, em nível de média, foram altas para DAP, tipo de casca e forma, variando de 0,50 a 0,85. A seleção pelo índice multiefeitos demonstrou que o número variável de plantas por progênie foi mais indicada para a maximização de ganhos genéticos (7,24%) e tamanho efetivo populacional (69,3). Esses resultados subsidiarão a transformação do teste em pomar de sementes por mudas e fornecimento de material para formação de pomar de sementes clonal. Palavras-chave: Ganhos na seleção; herdabilidade; melhoramento genético; variância genética. Abstract Estimates of genetic parameters for quantitative traits in open-pollinated families of Eucalyptus urophylla. Eucalyptus urophylla S. T.Blake is outstanding for valuable wood production potential, adaptation plasticity for different environmental conditions, and for tolerance to canker. However, genetic improvement of this specie in Brazil depends on the existence of genetic variability in the introduced populations. The objective of this study was to investigate the genetic variation and gains in quantitative traits in a population established in 1992 in Selvíria -MS. The progeny trial was established in a partially balanced, 8 x 8 lattice design, with 64 families, collected at Anhembi Experimental Station (IPEF/ESALQ/USP). Each plot was made up of eight trees planted in a 3 x 3 m spacing. Significant among families genetic variations were observed in diameter at breast height (DBH), bark type, stem form, and survival. Estimates of average family heritability were high for all traits, ranging from 0.50 to 0.85. The simulated selection by using multi-effect index showed that under a varying number of plants per family. This method is the most indicated to maximize genetic gains (7.24%) and the effective population size (69.3). These results are a useful support for the transformation of this test into a seedling seed orchard and to become a source of vegetative material to build a clonal seed orchard.

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“…Additionally, the adaptability to diverse soil and climate conditions, rapid growth and versatility of use of the wood for industrial purposes (Santos et al, 2004), also allow satisfaction of regular industrial supply.…”

Section: Introductionmentioning

confidence: 99%

“…The use of new genetic materials for genetic improvement programs can also minimize the negative effects caused by high levels of growth stresses in the production of cut wood (Santos et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

METHODS FOR ALLEVIATION AND REDUCTION OF THE EFFECTS OF GROWTH STRESSES IN Eucalyptus urophylla

2017

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-There are many species of the Eucalyptus genus presents high levels of the growth stress. These stresses are mechanical efforts generated during the tree growth to help maintaining the balance of the cup in response to environmental and silvicultural agents. The stresses are responsible for the cracks of tops and for the warp after unfolding. The objective of this study was to test five different methods to minimize the effects of growth stress on the production of Eucalyptus urophylla sawlogs. The boards produced were then evaluated and measured for cracking, arching, curvature and cupping. The treatment with herbicide presented the smallest medium indexes of cracking (16.63 cm) and of arching (0.23 mm.m -1 ), while the medium curvature was smaller than observed in boards unfolded in 72 hours after the reduction of the trees (0.88 mm.m -1 ). Unfolding after ten days of harvesting represented the less efficient technique in the cracking control, curvature and arching. The cupping was not observed during boards processing. The herbicide application was more efficient in the reduction of the effects of the growth tensions.Keywords: Unfold of the wood; Defects in wood; Sawmill. MÉTODOS DE ALÍVIO E REDUÇÃO DOS EFEITOS DE TENSÃO DE CRESCIMENTO EM Eucalyptus urophyllaRESUMO -São muitas as espécies do gênero Eucalyptus que apresentam altos níveis de tensões de crescimento. Essas tensões são esforços mecânicos gerados durante o crescimento da árvore que ajudam a manter o equilíbrio da copa, em resposta a agentes ambientais e silviculturais. As tensões de crescimento são responsáveis pelas rachaduras de topo e pelos empenamentos após o desdobro. O objetivo deste trabalho foi testar cinco técnicas para a redução dos efeitos da tensão de crescimento na produção de toras de Eucalyptus urophylla. Após a obtenção e desdobro das toras foram avaliados as rachaduras, o arqueamento, o encurvamento e o encanoamento. O tratamento com herbicida apresentou os menores índices médios de rachadura (16,63 cm) e de arqueamento (0,23 mm.m -1 ), enquanto o encurvamento médio foi menor observado em tábuas desdobradas em 72 horas após o abatimento das árvores (0,88 mm.m -1 ). O desdobro após dez dias ao abate representou a técnica menos eficiente no controle de rachadura, encurvamento e arqueamento. O encanoamento não foi observado durante o processamento das tábuas. A aplicação de herbicida foi a técnica mais eficiente na redução do efeito das tensões de crescimento.Palavras-chave: desdobro da madeira, defeitos na madeira, serraria.

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Estimates of genetic parameters of wood traits for sawn timber production in Eucalyptus grandis

Cited by 30 publications

References 12 publications

Genetic variation in wood density and correlations with tree growth in Prosopis africana from Burkina Faso and Niger

Genetic variation in wood density and correlations with tree growth in Prosopis africana from Burkina Faso and Niger

ESTIMATIVAS DE PARÂMETROS GENÉTICOS PARA CARACTERES QUANTITATIVOS EM PROGÊNIES DE POLINIZAÇÃO ABERTA DE Eucalyptus urophylla

METHODS FOR ALLEVIATION AND REDUCTION OF THE EFFECTS OF GROWTH STRESSES IN Eucalyptus urophylla

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