Analise das reservas de sementes de especies arboreas da restinga do municipio de Ipojuca-PE / Seed reserves of arboreal species in restinga from Ipojuca, in the state of Pernambuco, Brazil

AUTOR(ES)
DATA DE PUBLICAÇÃO

2006

RESUMO

Restinga of the northeast have been barely studied in all their aspects. Thus, this work was as objective analyzes seeds of arboreal species of great occurrence in the eserva Particular do Patrimônio Nacional (RPPN) de Nossa Senhora do Outeiro de Maracaípe n Ipojuca, located at the sea coast of Pernambuco to contribute with the knowledge of structure and these economic potentialities. Twenty-two species of fruits were harvested and the seeds were fixed in FAA70 or Karnovsky solutions and processed for microscopic analysis. Of these, eight species were embedded in Leica Historesin or paraffin and sectioned (5-7cm thick): Coccoloba laevis Casar. (Polygonaceae), Licania rigida (Chrysobalanaceae), Myrcia guianensis (Aulb.) DC. (Myrtaceae), Simaba cuneata A.St.-Hil. &Tul. (Simaroubaceae), Manilkara salzmannii (A.DC.) Lam (Sapotaceae), Maytenus impressa Reiss. (Celastraceae), Ocotea gardneri (Meisn.) Meiz (Lauraceae) and Serjania sp (Sapindaceae). After removing the paraffin and hydration, the materials were stained using several cytochemical methods to detect anionic residues, proteins, polysaccharides, starch, lipids and lignin. The stained sections were examined by light microscopy, using polarized light in some cases. The first four mentioned species of seeds were submitted to extraction to detect their principal reserves. The cytochemical results were confirmed by biochemical dosage revealing that C. laevis is a species where the starch is predominant; L. rigida has got higher contents of proteins and S. cuneata is oleaginous. M guianensis showed moderately rich in carbohydrates and proteins. Free and soluble sugars presented an unusual quantity in the seeds, with variation from 10% in C. laevis up to 25% in L. rigida , showing an possible and interesting adaptative factor to lack of water. Oxalate crystals, presence of tannins and lignified teguments were also characteristics found in most of the species and can be related to the defense and strategies of dispersion of the seeds. The cytochemical analysis revealed that although O. gardneri and Serjania sp are rich in starch and proteins, M. salzmannii presents lipids in appreciable amounts. Finally, it could be found that M. impressa presents endosperm well developed, possibly with hemiceluloses as the principal reserve while their cotyledons presented appreciable amounts of proteins. The other harvested fruits and seeds were processed for embebition and cut for future analysis and cytochemical characterization

ASSUNTO(S)

citoquimica restingas restingas sementes seeds cytochemistry

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