Data/hora: 03/06/2024 10:12:30

Provedor de dados: | 39
País: | Brazil
Título: | Are stem nectaries common in Gentianaceae Juss.?
Autores: | Dalvi,Valdnéa Casagrande; Meira,Renata Maria Strozi Alves; Azevedo,Aristéa Alves.
Data: | 2017-09-01
Ano: | 2017
Palavras-chave: | Coutoubeinae; Helieae; Potalieae; Saccifolieae; Secretory structures.
Resumo: | ABSTRACT Extrafloral nectaries (EFNs) are specialized structures that produce and release nectar and are located on leaves, cotyledons and, more seldomly, stems. Peculiar leaf nectaries have been described for thirty-three Neotropical species of Gentianaceae, while stem nectaries have been reported for only nine. The aim of this study was to verify the occurrence of stem EFNs within Gentianaceae and investigate the existence of a correlation between their occurrence and the geographical distribution of species. Samples of internodal regions from field and herbarium specimens were submitted to standard light microscopy techniques. Data regarding the geographical distribution of species were acquired from herbarium specimens and the literature. A total of 37 species were investigated, representing 25 genera distributed among five tribes. Nectaries, composed of modified epidermal cells, were observed in 16 species restricted to the Neotropical tribes Helieae, Saccifolieae, Potalieae and Coutoubeinae; exceptions were Cicendia quadrangularis and Zygostigma australe, which both occur in the Neotropics but do not possess EFNs. These results demonstrate that stem EFNs are common among Neotropical taxa of Gentianaceae, and are typically absent from taxa in temperate regions.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062017000300403
Editor: | Sociedade Botânica do Brasil
Relação: | 10.1590/0102-33062016abb0404
Formato: | text/html
Fonte: | Acta Botanica Brasilica  v.31 n.3 2017
Fonte: | info:eu-repo/semantics/openAccess