Data/hora: 10/06/2024 02:20:40

Provedor de dados: | 39
País: | Brazil
Título: | Corona development and floral nectaries of Asclepiadeae (Asclepiadoideae, Apocynaceae)
Autores: | Monteiro,Mariana Maciel; Demarco,Diego.
Data: | 2017-09-01
Ano: | 2017
Palavras-chave: | Asclepiads; Histochemistry; Ontogeny; Nectar; Structural; Diversity.
Resumo: | ABSTRACT Flowers of Asclepiadoideae are notable for possessing numerous nectaries and elaborate coronas, where nectar can accumulate but is not necessarily produced. Given the complexity and importance of these structures for reproduction, this study aimed to analyze the ontogeny of the corona, the structure and position of nectaries and the histochemistry of the nectar of species of Asclepiadeae. Two types of coronas were observed: androecial [C(is)] and corolline (Ca). The development of the C(is)-type of corona initiates opposite the stamens in all species examined with the exception of Matelea in which it begins to develop as a ring around the filament tube. Despite their morphological variation, coronas typically originate from the androecium. A notable difference among the studied species was the location of the nectaries. Primarily, they are located in the stigmatic chamber, where nectar composed of carbohydrates and lipids is produced. A secondary location of nectaries found in species of Peplonia and Matelea is within the corona, where nectar is produced and stored, composed of carbohydrates and lipids in Peplonia and only carbohydrates in Matelea. The functional role of nectar is related to the location of its production since it is a resource for pollinators and inducers of pollen germination.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062017000300420
Editor: | Sociedade Botânica do Brasil
Relação: | 10.1590/0102-33062016abb0424
Formato: | text/html
Fonte: | Acta Botanica Brasilica  v.31 n.3 2017
Fonte: | info:eu-repo/semantics/openAccess