Rubiaceae Juss. of Parque Estadual das Varzeas do Rio Ivinhema, Mato Grosso do Sul state : florisitic, reproductive system, spatial distribuition and relationships allometry of dytylous species / Rubiaceae Juss. do Parque Estadual das Varzeas do Rio Ivinhema, Mato Grosso do Sul : floristica, sistema reprodutivo, distribuição espacial e relações alometricas de especies distilicas

AUTOR(ES)
DATA DE PUBLICAÇÃO

2007

RESUMO

The Rubiaceae family is comprehended by almost 637 genera and 12.000 species distributed mainly in the tropical and subtropical regions of the world. In Brazil there are 101 genera and 1.010 species, distributed in several formations vegetation. It is represented by a great number of species in the understory of the tropical forests, exercising great influence in the structure of the vegetation. Those plants present several reproductive strategies, as for instance, the distyly, which morphs of pin and thrum, differ as to the height as sexual organs, that is, there is a reciprocal hercogamy. The present work was developed in Parque Estadual das Várzeas do Rio Ivinhema (PEVRI), and its objective was to study the floristic of the Rubiaceae species occurring in this area and, in additions observe the reproductive phenology, morphology and floral biology, reproductive system, spatial distribution and allometry relationships of some dystylous alreacely known species. The monthly trips for collecting the botanical material and observations were accomplished in the period the 09/2003 to 10/2006. The specimens were determined based on specialized references and visiting to herbaria. The study of reproductive phenology, morphology and floral biology, reproductive system eight species were analyzed: Coussarea hydrangeifolia (Benth.) Benth. &Hook., C. platyphylla Müll. Arg., Palicourea croceoides Desv. ex Ham., P. fastigiata Kunth, Psychotria capillacea (Müll. Arg.) Standl., P. carthagenensis Jacq., P. deflexa DC. and P. leiocarpa Cham. &Schltdl. The spatial distribution and allometry relationships were observed in Coussarea hydrangeifolia e Palicourea croceoides. In the PEVRI 45 species in 24 genera were identified. The most representative genera were Psychotria with ten species, Palicourea with four species, Borreria with three species, Alibertia, Chomelia, Coccocypselum, Coussarea, Diodela, Galianthe, Guettarda with two species each and the other genera with only one species each. Key for genera end species identification were presented, besides descriptions, illustrations and comments on important features for their recognition and distribution. The flowering of the studied species occurred in the rainy season, which coincides with the warsnest months of the year. The flowering the studied species was seqüencial, without superposition on the flowering peaks. The fruiting of the studied species occurred mainly in the rainy season. There were significant differences among the heights of the stamens and styles in pin and thrum flowers, thus confirming the reciprocal hercogamy among the floral morphs of each species and the species studied showed dimorphism in the length of the corolla, of the style lobes and of the anthers. From the species studied only Coussarea hydrangeifolia presented isoplethic populations, that is, balanced rate among the floral morphs. The tests of manual pollination accomplished in the studied species demonstrate that these are incompatible self and intramoph, except in Palicourea croceoides, Psychotria cappilacea and P. deflexa in these species all of the accomplished crossings resulted in fruits. P. cappilacea besides the compatibility self and intramoph also presented fruits in the agamospermia tests and spontaneous self-pollination. Coussarea hydrangeifolia and Palicourea croceoides presented clumped distribution among the floral morphs. The floral morph does not present allometry relationships between height and diameter characteristics, it is not possible to recognize the morphs pin and thrum starting from those relationships

ASSUNTO(S)

floristica rubiaceae rubiaceae distilia distyly parque estadual do rio ivinhema (ms) brazil) parque estadual do rio ivinhema (mato grosso do sul floristic

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