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| Virillo,Carolina Bernucci; Ramos,Flavio Nunes; Castro,Cibele Cardoso de; Semir,João. |
| (Floral biology and breeding system oi Psychotria tenuinervis Muell. Arg. (Rubiaceae) in the Atlantic rain forest, SE Brazil). The aim of this study was to investigate pollination biology, floral morphometry, morph ratio and breeding system oiPsychotria tenuinervis in an area of Atlantic rain forest in southeastern Brazil. Pollination biology was studied based on focal observations and the breeding system was determined using controlled crosses; data on flower production and floral morphometry were compared between the two floral morphs. Flower production by the two floral morphs was similar, with flowers being reciprocally herkogamous, diurnal and pollinated at similar frequencies, mainly by medium-sized bees. Corolla length and diameter, as well as... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Atlantic forest; Distyly; Flower; Herkogamy; Pollination. |
| Ano: 2007 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062007000400012 |
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| Castro,Cibele Cardoso de; Oliveira,Paulo Eugênio Alves Macedo de; Pimentel,Rejane Magalhães de Mendonça. |
| The family Rubiaceae comprises a wide spectrum of floral mechanisms and two of them seem to be common in certain groups, e.g., distyly in Rubioidae and styllar pollen in Ixoroidae. These mechanisms include herkogamy, which is interpreted as a strategy that avoids self-pollination. This is the first report on the reproductive biology of Chiococca alba, a species that is widely distributed in America. We studied floral biology and the mating system, which were evaluated through fruit set comparisons after controlled crosses (self- and cross-pollinations and test for apomixis), as well as through the evaluation of pollen tube growth resulting from these controlled crosses. Flowers of C. alba are herkogamous, cream, protandrous and lasted for two days. No... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Atlantic Rain Forest; Breeding system; Chiococca; Floral biology; Herkogamy; Pollination; Rubiaceae. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042008000200014 |
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| SIGRIST,MARIA R.; SAZIMA,MARLIES. |
| A biologia reprodutiva de Ruellia brevifolia foi estudada em populações naturais do sudeste brasileiro. R. brevifolia é um subarbusto que forma agrupamentos densos em áreas abertas mas sombreadas e floresce o ano todo, produzindo flores casmógamas (CH) e cleistógamas (CL) nas estações úmida e seca, respectivamente. A cleistogamia é do tipo climática, originando sementes no período de maior estresse ambiental. Flores CH são inodoras e possuem corola tubulosa e vermelha, sendo hercogâmicas ou não; apresentam protoginia, antese diurna e duram dois dias. Néctar é o principal recurso floral, sendo produzido em baixa quantidade (5,2 mil ± 2,36) e com concentração de açúcares em torno de 30%. Flores CL assemelham-se a botões jovens de flores CH e apresentam... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Floral biology; Herkogamy; Cleistogamy; Ornithophily; Psicophily. |
| Ano: 2002 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042002000100006 |
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