Pollen morphology of Malpighiaceae from Brazilian forest fragments

Abstract

The pollen morphology of 12 Brazilian native species of Malpighiaceae from forest fragments was investigated in search to expand the morphological knowledge of the species analyzed thus contributing to its palynology, taxonomy, and conservation. The pollen grains were acetolysed, measured, photographed using light microscopy and scanning electron microscopy, and described qualitatively. The quantitative data were analyzed by descriptive statistics and multivariate statistics. The pollen grains are monads, apolar or isopolar, small to large, with circular to quadrangular amb, oblate-spheroidal to prolatespheroidal, tricolporate with long colpi and lalongate endoaperture or 6-(7-8)-porate with or without colpoids and aspides, psilate-rugulate, rugulate or microreticulate exine, sexine thicker than nexine in most species. The results of this study point to differences in the morphology of the pollen grains in the analyzed species, which indicates Malpighiaceae as a eurypalynous family; this fact was also confirmed by quantitative data and the multivariate analysis. These data reinforce the importance of pollen morphology for identification and distinction of genus and species of the family.

A taxonomic aid arising from pollen grains of Cestrum L. and Solanum L. (Solanaceae): differences in ornamentation and aperture

“…When we compare the quantitative data of Solanaceae pollen grains with recent studies conducted in the same area (forest fragments from Cerrado), we can verify that the values of diameters combined with aperture measurements are also important for species segregation in Fridericia (Souza & Gasparino 2014), Malpighiaceae (Belonsi & Gasparino 2015) and Sapindaceae (Bellonzi et al 2020). For Bignoniaceae (Souza et al 2019) and Rubiaceae (Dutra et al 2020) species, the pollen grain diameters associated with other metric data help the recognition of some taxa.…”

“…Some studies on the pollen of native species from remaining forest fragments of Cerrado indicate variations in shape, aperture, amb, ornamentation and size of the pollen grains (Souza & Gasparino 2014;Belonsi & Gasparino 2015;Dutra & Gasparino 2018;Landi & Gasparino 2018;Souza et al 2019;Bellonzi et al 2020;Dutra et al 2020 andSoares et al 2021); therefore, the aim of this study was to identify morphological characteristics in pollen grains of Solanaceae species, in order to contribute with the palynology, taxonomy and conservation of these species in degraded areas. This analysis also intended to identify which morphological characters of the pollen grains are important in the segregation of native Solanaceae species in Cerrado forest fragments.…”

Pollen morphology of Rutaceae from Brazilian forest fragments

“…We verified that the quantitative data in some cases could help distinguish the species, as in Galipea jasminiflora (with large pollen grains) and Metrodorea nigra (among colporate species that also have larger pollen grains). For Rutaceae, as well as in other families also analyzed in forest fragments (Souza & Gasparino 2014;Belonsi & Gasparino 2015), qualitative data are the main tools in pollen species distinction.…”

“…Pollen studies on native species from remaining forest fragments indicate variations in shape, aperture, amb, ornamentation and size of the pollen grain (Souza & Gasparino 2014;Belonsi & Gasparino 2015), so the aim of this study is to identify morphological characteristics in pollen grains of the Rutaceae species which may be used for future taxonomic and palynological studies contributing to the conservation of these species in priority conservation areas.…”

Pollen types of Sapindaceae from Brazilian forest fragments: apertural variation

“…However, morphological studies rarely describe the pollen types for the family, which could help in the morphological grouping of genera and species. Thus, the aim of this work was to identify pollen types in Sapindaceae and to expand the morphological knowledge of the analyzed species from Brazilian forest fragments, increasing the studies on pollen conducted for the area (Souza & Gasparino 2014;Belonsi & Gasparino 2015;Dutra & Gasparino 2018;Landi &Souza et al 2019).…”