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Provedor de dados:  Acta Botanica
País:  Brazil
Título:  Development of carpels and ovules in Dialypetalanthus fuscescens Kuhlm. (Rubiaceae): an enigmatic taxon
Autores:  Figueiredo,Rogério da Costa
Vieira,Ricardo Cardoso
Mariath,Jorge Ernesto de Araújo
Moço,Maria Cecilia de Chiara
Toni,Karen L. G. De
Data:  2017-03-01
Ano:  2017
Palavras-chave:  Carpel development carpellary septum cauline placentation floral meristem
Ovule
Resumo:  ABSTRACT Dialypetalanthus is a monospecific genus that occurs in the Amazon Basin of Brazil, Bolivia and Peru and occupies a controversial position among the Rubiaceae. We continue this taxonomic discussion with the overall aim of clarifying the systematic position of D. fuscescens within the Rubiaceae. To accomplish this, we analyzed the ontogeny of its gynoecium, in particular the floral meristem, as well as the development of the carpels and cauline placentation. Gynosporogenesis and the differentiation of the carpellary septa and ovules were also described. Dialypetalanthus fuscescens was classified according to evolutionary diagrams found in the literature. The following characteristics were observed in D. fuscescens: 1) permanence of the floral meristem in the central basal part of the early flower bud; 2) dual origin of carpellary septum; 3) trizonate ovular primordia with only one fertile gynospore per ovule; and 4) cellular proliferation in the chalazal region. Embryological results confirm the classification of D. fuscescens in the subfamily Ixoroideae. These results are distinct from any others previously proposed in the evolutionary diagram. Therefore, we conclude that this study has presented evidence strongly suggesting that Dialypetalanthus possesses new morphological-type of ovule we refer to as the Dialypetalanthus-type.
Tipo:  Info:eu-repo/semantics/article
Idioma:  Inglês
Identificador:  http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062017000100128
Editor:  Sociedade Botânica do Brasil
Relação:  10.1590/0102-33062016abb0456
Formato:  text/html
Fonte:  Acta Botanica Brasilica v.31 n.1 2017
Direitos:  info:eu-repo/semantics/openAccess
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