Abstract Detail


Silveira , Fernanda Schmidt [1], de Vargas, Wanderleia  [2], Fortuna-Perez, Ana Paula [3], Miotto, Silvia Teresinha Sfoggia  [4].

Implications of glandular trichomes to describe a new species and to support infrageneric sytematics in Mimosa L. (Fabaceae).

Secretory structures as glandular trichomes have been useful to taxonomy at different hierarchical levels of Fabaceae. In Mimosa L. genus, few studies have comparatively investigated differences between similar species regarding glandular trichomes, although this feature seems to have taxonomic value for the genus. In this work, we investigated the significance of glandular trichomes and their content to support the delimitation of a new species of Mimosa and a related species, M.bifurca. To further distinguish them, morphological and geographical data were also used. We reported two types of glandular trichomes in the leaflets defined by the stalk cells: unisseriate or multisseriate, being the presence or absence of each one of them a distinctive feature to separating the studied species. The new species has only glandular trichomes with obconical head and unisseriate stalk, secreting lipids, while the similar species has also trichomes with multisseriate stalk and a different epidermis and parenchyma, which have a chemical content that reacted positively in the Nadi and Ferric Chloride tests. In addition, we noticed for the first time the presence of chemical content in the glandular trichomes, epidermis and parenchyma leaflets of Mimosa. The chemical content was also taxonomic valuable in separating the species. Furthermore, the taxonomic significance of anatomical features of glandular trichomes was discussed concerning the implications to the classification in Mimosa series Stipellares.

1 - Universidade Federal do Rio Grande do Sul, Instituto de Biociências, Botânica, Av. Bento Gonçalves, 9500, Porto Alegre, RS, 91501-970, BRAZIL
2 - Universidade Estadual Paulista Júlio de Mesquita Filho, Botânica, AC Rubião Junior Jardim Santo Inácio (Rubião Junior), Botucatu, SP, 18618-970, BRAZIL
3 -
4 - Universidade Federal do Rio Grande do Sul, Instituto de Biociências, Av. Bento Gonçalves, 9500, Porto Alegre, RS, 91501-970, BRAZIL

Leaf anatomy
 secretory structures
section Batocaulon 
series Stipellares
 Serra do Sudeste
South America

Presentation Type: Poster
Number: PTO003
Abstract ID:517
Candidate for Awards:None

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