morfologia dos tricomas das pétalas de espécies de pseudobombax dugand (malvaceae, bombacoideae) e seu significado taxonômico morphology of trichomes in petals of pseudobombax dugand (malvaceae, bombacoideae) species and its taxonomic significance
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ID: 202795
2009
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Abstract
O gênero Pseudobombax Dugand apresenta cerca de 30 espécies, é restrito à região Neotropical e apresenta taxonomia complexa, com muitas de suas espécies mal circunscritas. Parte de seus problemas taxonômicos é conseqüência do fato de que suas espécies perdem as folhas na floração e, portanto, a maioria delas é representada apenas por flores nas coleções de herbário. Neste trabalho, investigou-se a morfologia dos tricomas presentes nas pétalas de oito espécies de Pseudobombax. O estudo utilizou microscopia óptica e eletrônica de varredura a partir de amostras obtidas de material de herbário e flores fixadas em etanol a 70%. Em todas as espécies de Pseudobombax analisadas, foram encontrados dois tipos principais de tricomas: (a) tricomas 2-4-armados, sésseis, longos, flexíveis e com paredes finas, situados na face adaxial de todas as espécies; (b) tricomas tufosos, sésseis, curtos, rígidos, com paredes espessas e lignificadas, situados na face abaxial. Os dados qualitativos e quantitativos obtidos mostraram-se de valor taxonômico para a resolução de problemas de identificação específica em Pseudobombax.
Trichome morphology of the petals of Pseudobombax Dugand species was investigated. The eight species selected of Pseudobombax were analyzed using optical microscopy and scanning electron microscopy. The study detected the existence of variation, both qualitative and quantitative, in morphology of trichomes in petals of species analyzed. In Pseudobombax petals, two kinds of trichomes were found: (a) trichomes 2-4-armed, sessile, long, flexible and with thin walls, situated on the adaxial surface; (b) tufted trichomes, sessile, short, rigid, with thick, lignified walls, on the abaxial surface of the petals. The qualitative and quantitative data were of taxonomic value for the resolution of problems of specific identification in the genus.
Trichome morphology of the petals of Pseudobombax Dugand species was investigated. The eight species selected of Pseudobombax were analyzed using optical microscopy and scanning electron microscopy. The study detected the existence of variation, both qualitative and quantitative, in morphology of trichomes in petals of species analyzed. In Pseudobombax petals, two kinds of trichomes were found: (a) trichomes 2-4-armed, sessile, long, flexible and with thin walls, situated on the adaxial surface; (b) tufted trichomes, sessile, short, rigid, with thick, lignified walls, on the abaxial surface of the petals. The qualitative and quantitative data were of taxonomic value for the resolution of problems of specific identification in the genus.
| Reference Key |
carvalho-sobrinho2009actamorfologia
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| Authors | ;Jefferson Guedes de Carvalho-Sobrinho;Francisco de Assis Ribeiro dos Santos;Luciano Paganucci de Queiroz |
| Journal | monatshefte für chemie chemical monthly |
| Year | 2009 |
| DOI |
10.1590/S0102-33062009000400003
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