Abstract
Anatomical studies, besides being useful in the identification of the species, make it possible to generate information about the structure of the log in order to identify the relationships between the log and the technological properties of the wood. The aim of this work was to anatomically characterize the log of different genotypes of the genus Eucalyptus planted in the state of Minas Gerais – Brazil and to describe its main differences and/or similarities. Three genetically improved genotypes were evaluated, Eucalyptus urophylla x Eucalyptus grandis; Eucalyptus urophylla and Eucalyptus urophylla x Eucalyptus camaldulensis , aged whithin 6 to 7 years old. Discs of 9 trees were removed at breast height (1.30 meters from the ground). From each disk, specimens were obtained in the medulla-cambial direction with dimensions of approximately 2 cm³ to make permanent sheets, being that the anatomical characterization of the genotypes followed the recommendations of the IAWA Committee (1989). The results showed that the genotypes of Eucalyptus are very similar, however, differences were observed in the axial parenchyma and in the composition of rays.
Highlights
The anatomical studies, besides the identification of the species, make it possible to generate information about the wood structure, allowing to identify its interrelationship with the technological characteristics of the wood
The study emphasized the differences in the qualitative characteristics, since quantitative characteristics such as fiber length, wall thickness, height and width of ray and vessel diameter and density are influenced by the climatic changes
The main differences between the studied genotypes were rays and axial parenchyma, Pirralho et al (2014), studying nine species of Eucalyptus, noted that most of the anatomical differences in the species of the genus are related to the rays and axial parenchyma
Summary
The anatomical studies, besides the identification of the species, make it possible to generate information about the wood structure, allowing to identify its interrelationship with the technological characteristics of the wood. Studies on the anatomy of the species of the genus Eucalyptus mainly address the fiber dimensions, which present great potential for use as raw material in the forest industry. The genus Eucalyptus belongs to the family Myrtaceae and has more than 600 species, they develop in diverse conditions of soil and climate It has great economic importance in the country, since it constitutes a large part of the plantations of the forest sector (RAPASSI et al, 2008). The species of this genus are widely planted in Brazil due to the rapid growth and quality of the wood, for the production of cellulose, fibre panels, firewood, charcoal and civil construction (DIAS JÚNIOR et al, 2016). The objective of this work was to describe the log of the different genotypes of the genus Eucalyptus, in order to allow the differentiation of the genotypes of this genus so homogeneous, using the anatomy of wood as a tool
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