Data/hora: 03/06/2024 07:42:01

Provedor de dados: | 39
País: | Brazil
Título: | Pollen morphology of species of Graphistylis B. Nord. (Asteraceae) of Brazil
Autores: | Souza,Mariana Albuquerque de; Mendonça,Claudia Barbieri Ferreira; Esteves,Roberto Lourenço; Gonçalves-Esteves,Vania.
Data: | 2016-03-01
Ano: | 2016
Palavras-chave: | Cluster analysis; Ordination analysis; Palynology; Pollen grains; Senecioneae.
Resumo: | This paper presents the results of a palynological study of the species ofGraphistylis that were segregated fromSenecio (s.l.) (Seneciosect. Dichroa) and that are all endemic of Brazil. These species are found in mountainous regions of the states of Espirito Santo, Minas Gerais, Paraná, Rio de Janeiro, São Paulo and Santa Catarina. The pollen grains of eight species were acetolyzed and analyzed and photographed using light microscopy. Unacetolyzed pollen grains were analyzed and photomicrographed using scanning electron microscopy. The current study undertook a palynologically analysis of Graphistylis in order to obtain information useful for making a better ranking of these genus. The results show medium-sized pollen grains that were oblate spheroidal or prolate spheroidal and subtriangular amb and tricolporate. The pollen grains possessed lalongate endoapertures with a median constriction and the presence of costa in only two species. The exine is echinate with a varying number of spines in the apocolpium region around the central spine in polar view. The spines are short with basal perforations at varying distances. Although the morphology of the pollen of species ofGraphistylis is very similar, multivariate analysis highlights the importance of quantitative traits in distinguishing species.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062016000100138
Editor: | Sociedade Botânica do Brasil
Relação: | 10.1590/0102-33062015abb0300
Formato: | text/html
Fonte: | Acta Botanica Brasilica  v.30 n.1 2016
Fonte: | info:eu-repo/semantics/openAccess