Genetic parameters of Eucalyptus clones for early selection in frost occurrence region [Estimativas de parâmetros genéticos para seleção precoce de clones de Eucalyptus para região com ocorrência de geadas]
De Moraes C.B.,Sao Paulo State University |
De Freitas T.C.M.,Sao Paulo State University |
Pieroni G.B.,Empresa Palmasola S.A. |
Zimback L.,If Instituto Florestal Do Estado Of Sao Paulo |
Mori E.S.,Sao Paulo State University
Scientia Forestalis/Forest Sciences | Year: 2014
Further to increase the wood yield, is important goal of forest tree breeding the adaptation of clones through diverse environment, especially for soil and climate. Perennial tree species such as eucalypts, have a long life cycle and the frosts can occur and to be their limiting source of cultivation. The aim of the study was to determine the genetic variability and the genetic correlations between selection ages of clones cultivated in the municipality of Palma Sola, SC, Brazil, where frosts are common in the winter. A clonal trial was set up in 2008 in Palma Sola, by statistical design of randomized complete blocks considering 29 clones, six replications, six plants per plot, and 3.0m x 3.0 m spacing. The silvicultural characters of total plant height, diameter of breast height (dbh), and wood volume were evaluated through 24, 36, 48, and 60 months old. The deviance analysis and estimates of genetic parameters were based on the REML / BLUP genetic statistical procedure. Significant differences were observed for all traits in the deviance analysis. High correlations and statistically significant between characters were observed, indicating that the early selection will provide significant gains. Part of the clones USP/IPEF 64, USP/IPEF 78, USP/IPEF 52, USP/IPEF 68, and USP/IPEF 74) are potential to be used into the breeding programs and in commercial stands into the studied frost regions.
De Lima I.L.,If Instituto Florestal Do Estado Of Sao Paulo |
Longui E.L.,If Instituto Florestal Do Estado Of Sao Paulo |
Zanon B.,If Instituto Florestal Do Estado Of Sao Paulo |
Florsheim S.M.B.,If Instituto Florestal Do Estado Of Sao Paulo |
And 2 more authors.
Scientia Forestalis/Forest Sciences | Year: 2015
We investigated the effect of diameter class on the wood anatomy and properties of 24-year-old Liquidambar styraciflua to determine the potential wood quality in three different diameter classes: large (33cm), medium (26.5cm), and small (22.4cm). We hypothesize that different diameter classes have wood variations with potential distinct qualities. Results showed the highest values of compression parallel to the grain, shear parallel to the grain and modulus of rupture in the small and medium classes. Radial variation showed an increase in vessel diameter, decrease in the frequency of vessels, and increase in the fiber length toward the bark. In contrast to other studies, longer fibers were found, possibly associated with climatic conditions. Density did not vary among the three classes, but it was more homogeneous in the large and medium classes, but not the small class. Stiffness was more homogeneous in the large and small classes.