Genetic improvement of forest tree species

Assis, Teotônio Francisco de; Resende, Marcos Deon Vilela de

doi:10.1590/s1984-70332011000500007

Cited by 23 publications

(19 citation statements)

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“…The advantages of genetic improvement strategies in the development of new cultivars and the maximization of plantlet production have been discussed for the main vegetable and tree species for which vegetative propagation is used (Assis & Resende, 2011;Bisognin, 2011). Forest improvement has been concentrated on exotic species, mainly on the genera Eucalyptus, Pinus, Acacia and Tectona.…”

Section: Introductionmentioning

confidence: 99%

“…Forest improvement has been concentrated on exotic species, mainly on the genera Eucalyptus, Pinus, Acacia and Tectona. Among these, genetic improvement strategies for vegetative propagation are relatively well defined for Eucalyptus (Assis & Resende, 2011). In native species, studies have shown the viability of vegetative propagation by mini-cutting of Anadenanthera macrocarpa (Dias et al, 2012), Araucaria angustifolia (Pires et al, 2015) and Cabralea canjerana (Gimenes et al, 2015); however, strategies of early selection have not yet been investigated.…”

Section: Introductionmentioning

confidence: 99%

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Early selection of Cabralea canjerana for propagation by mini-cutting

Burin

Bisognin

Lencina

et al. 2018

Pesq. agropec. bras.

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The objective of this work was to define an early selection strategy to identify Cabralea canjerana (Meliaceae) clones with high multiplication rate. A mini-garden of 109 clones of canjerana seedlings was established in a completely randomized design, in an acclimatized greenhouse. From seedlings, the mini-stumps and mini-cuttings were obtained. Mini-cuttings were collected at five different times, and the number of mini-cuttings per mini-stump, rooting percentage, and number of rooted mini-cuttings were quantified. The number of rooted mini-cuttings per mini-stump was the only trait that showed high correlation with the others. Five groups of clones based on the number of rooted mini-cuttings per mini-stump were separated using k-means clustering, and the genetic gain from selection and Pearson correlation were estimated. The selection of the two best groups in each evaluation period resulted in high genetic gains from selection for all evaluated traits. Early selection for the number of rooted mini-cuttings discarded 65% of the evaluated clones, which increases experimental precision in evaluations of traits associated with plantlet growth and quality. Early selection for the number of rooted mini-cuttings per mini-stump at different times allows the identification of Cabralea canjerana clones with high multiplication rate.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Early selection of Cabralea canjerana for propagation by mini-cutting

Burin

Bisognin

Lencina

et al. 2018

Pesq. agropec. bras.

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“…In Eucalyptus, species comparisons trials were carried out in early 1960s and 1970s to match species to suitable environments across the world (Assis & Resende, 2011). In more advanced cycles, rolling-front types of strategies were implemented.…”

Section: Introductionmentioning

confidence: 99%

“…Openpollinated breeding strategies are still common in some eucalyptus species, because it is difficult to produce seed from controlled breeding in some species such as Eucalyptus nitens (Hamilton, Joyce, Williams, Dutkowski, & Potts, 2008). In Brazil, reciprocal recurrent selection between divergent populations and intrapopulation recurrent selection are common (Assis & Resende, 2011). Taking advantage of rooting abilities, the selected hybrid progeny are cultivated by vegetative propagation techniques.…”

Section: Introductionmentioning

confidence: 99%

Acceleration of Forest and Fruit Tree Domestication by Genomic Selection

Isik¹,

Kumar²,

Martínez-García³

et al. 2015

Advances in Botanical Research

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“…Nos anos 2000, apesar de ter sido o período em que o reflorestamento mais cresceu, o efeito produtividade foi maior devido à introdução dos clones, aos avanços na mecanização e, também, ao déficit de reflorestamentos que existiu no final da década de 1990.Os programas de melhoramento genético também são essenciais para o aumento de produtividade, pois proporcionam a introdução de materiais superiores em termos de crescimento e qualidade da madeira, por serem mais adaptados às características edafoclimáticas da região na qual foram selecionados(CAMPINHOS, 1999).Em espécies florestais, de modo geral, as estratégias básicas de melhoramento podem ser resumidas em seleção de procedências e seleção individual dentro das Outras características essenciais na silvicultura industrial são: adaptação, forma da árvore, o número e a distribuição dos ramos, bifurcação e resistência a pragas, doenças, geadas, seca e vento. A adaptação climática refere-se principalmente à adaptação à precipitação e temperatura(ASSIS et al, 2011). Estudo realizado por Carvalho et al (2012), tem-se que, entre os anos de 1960 a 2007, o principal fator que explicou o crescimento da produção de celulose foi a produtividade.…”

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Avaliação do efeito da face de exposição solar sobre o crescimento de plantios comerciais de Eucalyptus sp na região sudoeste do estado de São Paulo

Gonçalves¹

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Evaluation of the effect of the aspect on the growth of commercial Eucalyptus sp plantations in the southwest region of the state of São Paulo The eucalyptus cultivation regions boast a large number of environmental variables in micro-regional level, as can easily be seen when studying the expressive differences between the productivity of each forest area. To evaluate an environment, however, it is necessary to identify specific segments within a landscape with regards to a forest property and within that landscape study to seek the understanding of the interactions that takes place in the process. This work contributes to a better understanding of the effect of the aspect on growth in commercial plantations of Eucalyptus. The methodological approach presented in this work takes into account the knowledge of the physical environment, based on physiography, for distinction of aspect on environments, in addition to showing the interaction of physiographic factors with biological factors to support the decision-making process. The sharp interaction genotype x environment present in many cultures leads to studies of adaptability to specific environments to become integral parts of forestry research programs. The differentiated response of genotypes to favorable and unfavorable environments can assist forest managers in the allocation of assertive genetic materials to maximize productivity. The airborne laser scanning, which is an early tool used in Brazil, is an active optical sensor that measures the distance to the target objects, was used to obtain the height of the trees. The study area is located in the southwestern region of the State of São Paulo in Brazil. Among the available processing metrics, it was used 90 percentiles in height to estimate the height of homogeneous commercial plantations of Eucalyptus. A variance analysis was devised considering a factorial design contemplating the aspect (North and South) and genetic material (commercial clones), besides the interaction between both to observe the effect of the exposure on the height growth of the settlement. To forests below four years of age, it was observed that the plantations of the South exposure grow less than the north exposure. For forests above five years, this difference between aspect continues, however, when the deployment of factorial interactions is done, it's observed that the genetic materials planted in the north exposure do not differ with each other, but the difference stands within forests in the South exposure.

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Genetic improvement of forest tree species

Abstract: -Brazilian forestry sector is considered one of the most developed in the world

Cited by 23 publications

References 1 publication

Early selection of Cabralea canjerana for propagation by mini-cutting

Early selection of Cabralea canjerana for propagation by mini-cutting

Acceleration of Forest and Fruit Tree Domestication by Genomic Selection

Avaliação do efeito da face de exposição solar sobre o crescimento de plantios comerciais de Eucalyptus sp na região sudoeste do estado de São Paulo

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