Data/hora: 08/06/2024 10:18:14

Provedor de dados: | 39
País: | Brazil
Título: | Breeding biology and distyly in Palicourea rigida H. B. &amp;amp; K. (Rubiaceae) in the Cerrados of Central Brazil
Autores: | Machado,Adriana de Oliveira; Silva,Ana Palmira; Consolaro,Helder; Barros,Mariluza A. Granja e; Oliveira,Paulo Eugênio.
Data: | 2010-09-01
Ano: | 2010
Palavras-chave: | Heterostyly; Tropical savanna; Heteromorphic self-incompatibility; Hummingbirds.
Resumo: | Distyly is a floral polymorphism more common among the Rubiaceae than in any other angiosperm group. Palicourea rigida is a typically distylous species of the Rubiaceae widely distributed in the Brazilian Cerrados. This work aimed to study the floral biology and breeding system of P. rigida in order to verify if there wasasymmetry between floral morphs. The work was carried out at Fazenda Água Limpa, Brasília-DF, from 1993 to 1995; and at Serra Caldas Novas State Park-Goias and in Clube Caça e Pesca Itororó de Uberlândia-Minas Gerais in 2005 and 2006. Density, height and pin/thrum ratio were assessed for flowering individuals in all areas. Plants were investigated for differences in floral morphology, nectar production, reproductive success and site of self incompatibility reactions. Blooming period was long and concentrated during the rains. Flowers were clearly distylous and with reciprocal herkogamy. They produced nectar and lasted for a single day. In spite of differences in density and height, populations were mostly isoplethic. Nectar production varied in volume and concentration but the differences could not be associated with floral morphs. The species is self-incompatible but reproductive success was always high and independent of floral morphs. There were differences in the site of incompatibility barriers between floral morphs, which were similar to those observed for other Rubiaceae. The main floral visitors and pollinators were the hummingbirds Colibri serrirostris and Eupetomena macroura. High fruit-set indicates that the pollinators transported enough compatible pollen grains between floral morphs, despite their territorial behavior.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062010000300012
Editor: | Sociedade Botânica do Brasil
Relação: | 10.1590/S0102-33062010000300012
Formato: | text/html
Fonte: | Acta Botanica Brasilica  v.24 n.3 2010
Fonte: | info:eu-repo/semantics/openAccess