Provenance variation and genetic parameters of Eucalyptus viminalis in Argentina

Abstract

Genetic parameters for growth, stem straightness, pilodyn penetration, relative bark thickness and survival were estimated in a base-population of five open-pollinated provenance/progeny trials of Eucalyptus viminalis. The trials, located in northern, central and southern Buenos Aires Province, Argentina, comprised 148 open-pollinated families from 13 Australian native provenances and eight local Argentinean seedlots. The Australian native provenances come from a limited range of the natural distribution. Overall survival, based on the latest assessment of each trial, was 62.4%. Single-site analyses showed that statistically significant provenances differences (p<0.05) for at least one of the studied traits in three out of the five trials analyzed. The local land race performed inconsistently in this study. The average narrow-sense individual-tree heritability estimate b h 2 was 0.27 for diameter and 0.17 for total height. Values of b h 2 also increased with age. Pilodyn penetration, assessed at only one site, was more heritable b h 2 ¼ 0:32 than the average of growth traits. Estimated individual-tree heritabilities were moderate to low for stem straightness (average of 0.20) and relative bark thickness (0.16). The estimated additive genetic correlations r A ð Þ between diameter and height were consistently high and positive (rAaverage of 0.90). High additive genetic correlations were observed between growth variables and pilodyn penetration (rA average of 0.58). Relative bark thickness showed a negative correlation with diameter rA ¼ À0:39 ð Þ and height rA ¼ À0:51 ð Þ . The average estimated additive genetic correlation between sites was high for diameter (0.67). The implications of all these parameter estimates for genetic improvement of E. viminalis in Argentina are discussed.

Heritability of stem straightness and genetic correlations in Eucalyptus cladocalyx in the semi-arid region of Chile

“…There are conflicting studies on the impact the trait straightness can have on growth. For example, Cappa et al (2010) found non-significant genetic correlations for growth and straightness of Eucalyptus viminalis trees in The marginal posterior distributions of the estimated genetic correlation between environments are shown in Figure 2. The values of genetic correlation between locations were high and statistically different from zero, according to the Bayesian confidence intervals (p = 95%), indicating no genotype-environment interaction; because the values of genetic correlation were positive and relatively high, in other words, the best-performing trees of one location could maintain this superiority at another.…”

“…We used a bi-character model to calculate the additive genetic correlations between two different measured traits of the same individual as well as the genetic correlation between two locations, considering the measurements at the two locations as different characters (Cappa et al 2010). The model can be described as follows: (1 and 2); X 1 and X 2 represent the design matrices; β 1 and β 2 are the vectors of the parameters of location, block within location and population; Z 1 and Z 2 are the incidence matrices for additive effects; u 1 and u 2 the vectors of additive effects and ε 1 and ε 2 the error vectors.…”

“…This product is result of the selection of trees with improved growth traits (e.g., straightness), to produce poles for agriculture (Mora et al 2009, Bush et al 2011. In this sense, the genetic evaluation plays a key role in breeding for wood quality (Mahmood et al 2003, Cappa et al 2010, because the variability within a given population is the basis underlying genetic gains and a result of the expression of each particular genotype and its interaction with the environment. The conservation of the genetic diversity and heterozygosity in allogamous species such as Eucalyptus can maintain the possibility of permanent genetic gains over time (Danusevicius and Lindgren 2002).…”

Processing sawn wood from thinned, unpruned 17-year-oldEucalyptus dunniiin southern China

“…McKimm (1985), Purnell (1988), Blackburn et al (2011) and others have reported significant provenance variation in E. nitens for a range of wood properties including wood density, collapse, growth strain and modulus of elasticity. Cappa et al (2010) found significant provenance variation in E. viminalis for wood basic density across a number Grades were converted to numerical values as follows: grade 1 = 'select'; 2 = 'clear'; 3 = 'standard'; 4 = 'utility'; 5 = 'pallet'; and 6 = reject. Thus, a lower average grade score indicates higher quality.…”

Eucalyptus robusta pour une production durable de bois énergie à Madagascar : bilan des connaissances et perspectives

“…La sélec-tion phénotypique sur la vigueur des arbres a été peu efficace, en raison principalement de la faible héritabilité de ce trait le coefficient h² varie chez les espèces forestières entre 0,19 et 0,26 (WHITE et al, 2007). Ainsi, pour le diamè-tre, h² = 0,11 chez E. globulus (CALLISTER et al, 2013), h² = 0,27 pour E. viminalis (CAPPA et al, 2010) et 0,06 < h² < 0,21 pour E. robusta à Madagascar (RAZAFIMAHATRATRA, 2013). Les propriétés chimiques et technologiques du bois, essentielles pour le bois d'oeuvre et le charbon de bois, n'ont malheureusement pas été prises en compte lors de la sélection des arbres et de la création des vergers à graines malgaches.…”