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Acta Botanica Brasilica

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

Abstract

MEZZONATO-PIRES, Ana Carolina; MENDONCA, Cláudia Barbieri Ferreira  and  GONCALVES-ESTEVES, Vania. Pollen morphology of selected species of Passiflora L. (Passifloraceae) from the Atlantic Forest. Acta Bot. Bras. [online]. 2015, vol.29, n.3, pp.391-399. ISSN 0102-3306.  http://dx.doi.org/10.1590/0102-33062015abb0014.

Pollen grains from twelve species of the Passifloraceae family from the Brazilian Atlantic Forest were analyzed: Passiflora subg. Astrophea (1sp.), P.subg. Decaloba (1sp.) and P.subg. Passiflora (10spp.). The current study aims to acquire additional information and feature the pollen morphology of the herein studied species to help setting a more precise taxa delimitation. Acetolyzed pollen grains were measured, described and illustrated using light and scanning electron microscopy. The pollen grains were medium or large sized, oblate spheroidal, suboblate, prolate spheroidal and subprolate; 4-colpate (P. kermesina), 6-12-pantocolporate (P. mediterranea), 6-colpate (P. mucronata), 6-colporate (P. pentagona), 12-colporate (P. misera) or 6-syncolpate (in most species). The presence of reticulate sexine, pseudopercula, pontopercula and/or opercula was observed. The endoaperture was just found in P. pentagonaand P. misera. It was concluded that pollen morphology is an important source of taxonomic features useful for distinguishing species and characterizing the three subgenera. The current study provides additional information that, along with other previously published studies, will enable a better understanding of phylogenetic relations among these strains.

Keywords : Atlantic Forest; palynotaxonomy; Passiflora; Passifloraceae; sandbanks.

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