Taxonomic value of foliar characters in Dahlstedtia Malme: Leguminosae, Papilionoideae, Millettieae

Acta Botanica Brasilica

Simone De Pádua Teixeira²  Antonio Carlos Gabrielli¹ 

[1] ,Universidade de São Paulo Faculdade de Ciências Farmacêuticas Departamento de Ciências FarmacêuticasRibeirão Preto SP ,Brasil

关键词: cambial activity;    Dahlstedtia pinnata;    Dahlstedtia pentaphylla;    paraveinal mesophyll;    secretory cavity;    atividade cambial;    cavidades secretoras;    Dahlstedtia pinnata;    Dahlstedtia pentaphylla;    parênquima paravenal;   

DOI  :  10.1590/S0102-33062006000200014

来源: SciELO

【 摘 要 】

Dahlstedtia Malme (Leguminosae) is a neotropical genus, native to the Brazilian Atlantic Forest, and comprises two species, D. pinnata (Benth.) Malme and D. pentaphylla (Taub.) Burk., although it has been considered a monotypic genus by some authors. Leaf anatomy was compared to verify the presence of anatomical characters to help delimit species. Foliar primordium, leaflet, petiolule, petiole and pulvinus were collected from cultivated plants (Campinas, SP, Brazil) and from natural populations (Picinguaba, Ubatuba and Caraguatatuba, SP, Brazil - D. pinnata; Antonina, PR, Brazil - D. pentaphylla). Studies on leaflet surface assessment (Scanning Electron Microscopy), as well as histology and venation analyses were carried out of dehydrated, fresh and fixed material from two species. Leaflet material was macerated for stomatal counts. Histological sections, obtained by free-hand cut or microtome, were stained with Toluidine Blue, Safranin/Alcian Blue, Ferric Chloride, Acid Phloroglucin. Secretory cavities are present in the lamina, petiolule, petiole, pulvinus and leaf primordium in D. pentaphylla, but not in D. pinnata, and can be considered an important character for species diagnosis. Other leaf characters were uninformative in delimiting Dahlstedtia species. There is cambial activity in the petiolule, petiole and pulvinus. This study, associated with other available data, supports the recognition of two species in Dahlstedtia.

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