Morfologia e anatomia foliar de dicotiledôneas arbóreo-arbustivas do cerrado de São Paulo, Brasil
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Data
2006-12-18
Autores
Bieras, Angela Cristina [UNESP]
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Universidade Estadual Paulista (Unesp)
Resumo
Com o objetivo reconhecer os padrões morfológico e anatômico predominantes para as folhas de dicotiledôneas do cerrado, foram estudadas a morfologia de 70 espécies e a anatomia de 30 espécies arbóreo-arbustivas representativas da flora desse bioma no estado de São Paulo. As folhas são na sua maioria simples, variando de mesófila a microfila; apresentam lâminas elípticas, com margens inteiras e com bases e ápices convexos. Quanto à organização anatômica, em geral, as folhas de cerrado são dorsiventrais, hipostomáticas, encontram-se recobertas por tricomas e por espessas camadas de cera e de cutícula e possuem tecido vascular circundado por fibras. O tecido paliçádico é desenvolvido, sendo comum no mesofilo a ocorrência de células esclerificadas, distribuídas esparsamente, e de idioblatos contendo fenóis e cristais. Os resultados anatômicos encontrados foram comparados com descrições da literatura para outros representantes desse bioma e das famílias a que essas espécies pertencem. O possível significado desses caracteres é discutido dentro de um contexto adaptativo e evolutivo para o bioma cerrado.
With the objective of recognizing the commonest leaf pattern of the trees and shrubs of the cerrado vegetation, we studied the leaf morphology of 70 dicotyledons and the leaf anatomy of 30 species well represented in this bioma. The leaves are mostly simple, vary from mesophyll to microphyll, and the blades are eliptical with entire edges and with convex base and apex. They are mostly dorsiventral and hypostomatic, and covered by trichomes and thick layer of wax and cuticle; the vascular bundles are surrounded by a sheath of fibers. The mesophyll has a developed palisade tissue, dispersed sclerified cells and idioblasts bearing crystals and phenolic compounds. The anatomical results were compared with the described for other species from the same biome and for the families that the studied species belong. The possible meaning of these features is discussed under an adaptative and evolutive point of view.
With the objective of recognizing the commonest leaf pattern of the trees and shrubs of the cerrado vegetation, we studied the leaf morphology of 70 dicotyledons and the leaf anatomy of 30 species well represented in this bioma. The leaves are mostly simple, vary from mesophyll to microphyll, and the blades are eliptical with entire edges and with convex base and apex. They are mostly dorsiventral and hypostomatic, and covered by trichomes and thick layer of wax and cuticle; the vascular bundles are surrounded by a sheath of fibers. The mesophyll has a developed palisade tissue, dispersed sclerified cells and idioblasts bearing crystals and phenolic compounds. The anatomical results were compared with the described for other species from the same biome and for the families that the studied species belong. The possible meaning of these features is discussed under an adaptative and evolutive point of view.
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Palavras-chave
Anatomia vegetal, Cerrados
Como citar
BIERAS, Angela Cristina. Morfologia e anatomia foliar de dicotiledôneas arbóreo-arbustivas do cerrado de São Paulo, Brasil. 2006. ii, 35 f. Tese (doutorado) - Universidade Estadual Paulista, Instituto de Biociências de Rio Claro, 2006.