Data/hora: 10/06/2024 11:20:56

Provedor de dados: | 39
País: | Brazil
Título: | Pollen morphology of Centaurea L. (Asteraceae) in Iran
Autores: | Shabestari,Elaheh Sadat Bagheri; Attar,Farideh; Riahi,Hosein; Sheidai,Masoud.
Data: | 2013-12-01
Ano: | 2013
Palavras-chave: | Centaurea; Palynology; Exine ornamentation; Light microscopy; Scanning electron microscopy.
Resumo: | The genus Centaurea L. is one of the largest genera in the family Asteraceae. The number of taxa included in this genus ranges from 500 to 600 worldwide. Iran is one of the major centers of diversity for this genus. Pollen morphology has proved useful in the systematics of Asteraceae, as well as in that of some of its genera and species. The pollen morphology of 19 taxa of the genus Centaurea was investigated in detail by light and scanning electron microscopy. Examination under light microscopy showed pollen grains to be tricolporate, isopolar, radially symmetrical, oblate spheroidal, prolate spheroidal, subprolate, tectum perforate and scabrate. Based on the exine ornamentation observed under scanning electron microscopy, we identified two types of pollen grains, designated type I (dense acute spinules) and type II (sparse spinules). All of the taxa evaluated resemble Wagenitz's Jacea type. We present micrographs of pollen grains, together with descriptions of the characteristics of their structure. We found that the pollen characters (shape, exine structure, sculpturing) were useful for classification.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062013000400004
Editor: | Sociedade Botânica do Brasil
Relação: | 10.1590/S0102-33062013000400004
Formato: | text/html
Fonte: | Acta Botanica Brasilica  v.27 n.4 2013
Fonte: | info:eu-repo/semantics/openAccess