Morfologia polínica da vegetação da restinga de Algodoal-PA. VII: Família Convolvulaceae

Abstract

The islands of Algodoal and Maiandeua in the municipality of Maracanã, Pará State, Brazil, have a characteristic restinga vegetation with diverse plant communities, with great potential for palynological studies. Restingas are coastal ecosystems, physically determined by edaphic conditions and by marine influence, of recent sedimentary origin, and the species living there have mechanisms to withstand the dominant physical factors. The objective of this work is to analyze the pollen morphology of the Convolvulaceae family, continuing the work that deals with the palynology of restinga species. The species studied were: Aniseia martinicensis (Iacq) , Ipomoea asarifolia (Ders.) Roem & Schult., ipomoea cynanchifolia Meiss., /pomoeagoyazensis Gard, Ipomoea littoralis (L.) Choisy,Ipomoea pes-caprae Rottb., Ipomoea platensis Kerr., Ipomoea setifera Poir., Ipomoea stolonifera (Cyr.) Gmell., Merremia cissoides (Lam.) HalI. Adult flower buds were taken from the herbaria MG (Museu Paraense Emílio Goeldi) and IAN (Embrapa, Amazônia Oriental). Erdtman's acetolysis method was used for slide preparation. The pollen grains were subsequently analyzed for size, shape and number of openings and stratification of the exine. The grains were micrographed under light microscope and scanning electron microscope. It was observed that the pollen grains are large, isopolar and apoIar. Isopolars are large, suboblate and prolate, 3-collate and 5-collate with a slightly to strongly granular surface. The apoIars are large, spheroidal, pantoporate, pierced surface, with the presence of spines and bracts. These results agree with Salgado-Laboriau's (1971) description of the family. A pollen key was made in order to separate the species.