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Provedor de dados:  Acta Amazonica
País:  Brazil
Título:  Use of anatomical root markers for species identification in Catasetum (Orchidaceae) at the Portal da Amazônia region, MT, Brazil
Autores:  SILVA,Ivone Vieira da
OLIVEIRA,Rubens Maia de
ROSSI,Ana Aparecida Bandini
SILVA,Angelita Benevenuti da
OLIVEIRA,Daiane Maia de
Data:  2015-03-01
Ano:  2015
Palavras-chave:  Adaptations
Resumo:  Orchidaceae is one of the largest botanical families, with approximately 780 genera. Among the genera of this family, Catasetum currently comprises 166 species. The aim of this study was to characterize the root anatomy of eight Catasetum species, verifying adaptations related to epiphytic habit and looking for features that could contribute to the vegetative identification of such species. The species studied were collected at the Portal da Amazônia region, Mato Grosso state, Brazil. The roots were fixed in FAA 50, cut freehand, and stained with astra blue/fuchsin. Illustrations were obtained with a digital camera mounted on a photomicroscope. The roots of examined species shared most of the anatomical characteristics observed in other species of the Catasetum genus, and many of them have adaptations to the epiphytic habit, such as presence of secondary thickening in the velamen cell walls, exodermis, cortex, and medulla. Some specific features were recognized as having taxonomic application, such as composition of the thickening of velamen cell walls, ornamentation of absorbent root-hair walls, presence of tilosomes, composition and thickening of the cortical cell walls, presence of mycorrhizae, endodermal cell wall thickening, the number of protoxylem poles, and composition and thickening of the central area of the vascular cylinder. These traits are important anatomical markers to separate the species within the genus and to generate a dichotomous identification key for Catasetum. Thus, providing a useful tool for taxonomists of this group
Tipo:  Info:eu-repo/semantics/article
Idioma:  Inglês
Editor:  Instituto Nacional de Pesquisas da Amazônia
Relação:  10.1590/1809-4392201401832
Formato:  text/html
Fonte:  Acta Amazonica v.45 n.1 2015
Direitos:  info:eu-repo/semantics/openAccess

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