<abstract xmlns="http://www.w3.org/1999/xhtml"><p>Forest companies prefer a coppice system as a silvicultural strategy owing to its economic and sustainability advantages compared to developing new plantations for second rotations. However, studies aiming to determine the selection of superior genetic material for this management strategy are scarce. In this study, we evaluated five clonal tests of <italic>Eucalyptus</italic> spp. located in Itatinga and Angatuba, São Paulo State, Brazil, to determine the genetic correlations and control of productivity for regrowth management in two rotations. The volume (m<sup>3</sup>) and survival of the <italic>Eucalyptus</italic> spp. clonal tests were determined for the two rotations at 5.5 years of age. The experiments were carried out in a randomized block design with six replicates, five plants per plot, and unbalanced treatments. The heritability in the normal scale (<inline-formula><alternatives><inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="graphic/j_sg-2020-0002_eq_001.png"></inline-graphic><math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mrow><msubsup><mrow><mover><mi>h</mi><mo>^</mo></mover></mrow><mi>n</mi><mn>2</mn></msubsup></mrow></math><tex-math>\hat h_n^2</tex-math></alternatives></inline-formula>) for the survival ranged from 0.056 to 0.11, the heritability in the broad sense (<inline-formula><alternatives><inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="graphic/j_sg-2020-0002_eq_002.png"></inline-graphic><math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mrow><msubsup><mrow><mover><mi>h</mi><mo>^</mo></mover></mrow><mi>g</mi><mn>2</mn></msubsup></mrow></math><tex-math>\hat h_g^2</tex-math></alternatives></inline-formula>) ranged from 0.205 to 0.334, and the genotypic correlation was positive and high (0.71-0.86), and statistically significant to the genetic means for the two rotations. The ranking of the best clones in the second rotation was similar (76 %) to their ranking in the first selection. Thus, for the evaluated material, there was no need for the second measurement to obtain accurate selection when managing a coppice system.</p></abstract>

Forest companies prefer a coppice system as a silvicultural strategy owing to its economic and sustainability advantages compared to developing new plantations for second rotations. However, studies aiming to determine the selection of superior genetic material for this management strategy are scarce. In this study, we evaluated five clonal tests of Eucalyptus spp. located in Itatinga and Angatuba, São Paulo State, Brazil, to determine the genetic correlations and control of productivity for regrowth management in two rotations. The volume (m3) and survival of the Eucalyptus spp. clonal tests were determined for the two rotations at 5.5 years of age. The experiments were carried out in a randomized block design with six replicates, five plants per plot, and unbalanced treatments. The heritability in the normal scale (h^n2\hat h_n^2) for the survival ranged from 0.056 to 0.11, the heritability in the broad sense (h^g2\hat h_g^2) ranged from 0.205 to 0.334, and the genotypic correlation was positive and high (0.71-0.86), and statistically significant to the genetic means for the two rotations. The ranking of the best clones in the second rotation was similar (76 %) to their ranking in the first selection. Thus, for the evaluated material, there was no need for the second measurement to obtain accurate selection when managing a coppice system.

Genetic control of coppice regrowth in <italic>Eucalyptus</italic> spp.

Escola Superior de Agricultura “Luiz de Queiroz” ESALQ/USP

Silvae Genetica

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Genetic control of coppice regrowth in  spp.

Forest companies prefer a coppice system as a silvicultural strategy owing to its economic and sustainability advantages compared to developing new plantations...

Genetic control of coppice regrowth in Eucalyptus spp.

Publié en ligne: 04 févr. 2020

Pages: 6 - 12

DOI: https://doi.org/10.2478/sg-2020-0002

Mots clés
coppice, quantitative genetics, tree breeding, urograndis

© 2020 Marcos Rafael Amâncio et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Genetic control of coppice regrowth in Eucalyptus spp.

Publié en ligne: 04 févr. 2020

Pages: 6 - 12

DOI: https://doi.org/10.2478/sg-2020-0002

Mots cléscoppice, quantitative genetics, tree breeding, urograndis

© 2020 Marcos Rafael Amâncio et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Mots clés
coppice, quantitative genetics, tree breeding, urograndis