SciELO - Scientific Electronic Library Online

 
vol.30 issue4Spatial patterns of two co-occurring savanna and forest tree species in a dense fire-protected savanna fragmentDoes inter-plant variation in sprouting time affect the growth/reproduction trade-off and herbivory in a tropical tree species? author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Services on Demand

Journal

Article

Indicators

Related links

Share


Acta Botanica Brasilica

Print version ISSN 0102-3306On-line version ISSN 1677-941X

Abstract

FLORENTIN, Mariela Nuñez; CABANA FADER, Andrea  and  GONZALEZ, Ana Maria. Morpho-anatomical and morphometric studies of the floral structures of the distylous Oldenlandia salzmannii (Rubiaceae). Acta Bot. Bras. [online]. 2016, vol.30, n.4, pp.585-601.  Epub Nov 10, 2016. ISSN 0102-3306.  http://dx.doi.org/10.1590/0102-33062016abb0247.

The genus Oldenlandia (Rubiaceae) has a conflicting generic delimitation, with representatives that show different floral syndromes. Oldenlandia salzmannii is a marshy herb that is widespread in South America. It is heterostylous, specifically distylous, and self-compatible. Recent molecular phylogenetic studies found that this species forms a clade that is isolated from the remaining described taxa of Oldenlandia. Information about the floral anatomy and reproductive biology of genera in the Spermacoceae tribe, particularly Oldenlandia, is insufficient, especially among the neotropical species. Accordingly, the present study aimed at contributing information on the reproductive biology of Oldenlandia salzmannii by analyzing its floral morpho-anatomy, morphometrics and phenology of both floral morphs. These analyses were conducted with natural, cultivated and fixed material using optical and scanning electron microscopes. Morphologically, the species is typically heterostylous with two floral morphs, long-styled and short-styled, the main difference being the indument of the corolla. The short-styled flowers have larger anthers and pollen grains. Morphometrics show a high degree of herkogamic reciprocity. The mature ovules have a hemitropous position, which is the first record of this position for the Spermacoceae tribe. This study represents the first comprehensive morphological study of Oldenlandia salzmannii.

Keywords : floral anatomy; heterostyly; Oldenlandia salzmannii; ovule development; Spermacoceae.

        · text in English     · English ( pdf epdf )