Caracterização anatómica da casca de Eucalyptus nitens (Deane & Maiden) e Eucalyptus rudis Endl. para identificação das espécies
| Autor: | Patrício, Helena Sofia Maurício |
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| Přispěvatelé: | Pereira, Helena Margarida Nunes, Santos, Teresa Quilhó Marques dos |
| Jazyk: | portugalština |
| Rok vydání: | 2014 |
| Předmět: | |
| Zdroj: | Repositório Científico de Acesso Aberto de Portugal Repositório Científico de Acesso Aberto de Portugal (RCAAP) instacron:RCAAP |
| Popis: | Mestrado em Engenharia Florestal e dos Recursos Naturais - Instituto Superior de Agronomia The bark of 5 trees of E. nitens with 4 and 10 years of age, and 5 trees of E. rudis with 4 years of age was analyzed. The qualitative characterization and the determination of the tissue proportions were made on histological thin sections and quantitative characterization on dissociated elements; the dimension of fibres, axial parenchyma and expanded cells was also determined. The species showed: reduced rhytidome, periderm composed by phellem with suberised and lignified cells and phelloderm; non-collapsed phloem with tangential layers with axial parenchyma alternating with sieve tube elements and fibre bundles; the collapsed phloem is characterized by the change of the parenchyma cells and sclereids. The length, width and wall thickness of fibers was in 4-year-old E. nitens 0.90 mm; 16.2 μm and 4.7 μm; in 10-year-old E. nitens 1.05 mm; 17.8 μm and 5.2 μm and E. rudis 0.84 mm; 21 μm and 6 μm respectively. The expanded axial parenchyma cells are the most abundant phloem tissue (38-48%) in both species; the percentage of fibers was higher in E. nitens (33%). The species differed in the type of periderm, in the arrangement of the expanded cells and in the occurrence of secretory cavities. |
| Databáze: | OpenAIRE |
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