HEARTWOOD FLUORESCENCE OF TROPICAL SPECIES

The aim of this study was to analyze and classify the fluorescence emission from the heartwood of twenty-three tropical species. For the same, the device of ultraviolet light emission was used. Then, histological sections were made from two samples that showed fluorescence with strong and weak intensity, respectively, and another one sample that did not show fluorescence. They were observed in a fluorescence microscope under different emission filters for fluorescent light. Nine species belonging to three different families showed positive fluorescence of the heartwood. All samples from Anacardiaceae family were positive concerning the heartwood fluorescence. The results found in this work confirm the abundance of flavonoid extractives in species of Anacardiaceae. Thus, the heartwood fluorescence test proved to be an efficient method for contributes in the differentiation between species with or without heartwood fluorescent. O objetivo deste trabalho foi analisar e qualificar a emiss ￡o de fluoresc ancia do cerne de vinte e tr as esp cies tropicais. Para isso, utilizou-se um gabinete de emiss ￡o de luz ultravioleta. Posteriormente, cortes histol 3gicos de duas amostras que emitiram fluoresc ancia de forte e fraca intensidade, respectivamente, e de outra amostra que n ￡o emitiu fluoresc ancia foram obtidos e observados em microsc 3pio de fluoresc ancia sob diferentes filtros de emiss ￡o de luz fluorescente. Nove esp cies provenientes de tr as diferentes fam -lias apresentaram fluoresc ancia positiva do cerne, sendo que todas as amostras da fam -lia Anacardiaceae foram positivas quanto a essa caracter -stica. A partir dos resultados encontrados no presente trabalho, confirma-se a abund ￠ncia do extrativo flavonoide nas esp cies de Anacardiaceae. Dessa forma, o teste de fluoresc ancia do cerne demonstrou ser um m todo eficiente para contribuir na diferencia § ￡o entre esp cies que apresentem ou n ￡o fluoresc ancia.