Abstract

We analyzed the pollen morphology of 13 Brazilian native species of Malvaceae s.l. from forest fragments of Cerrado belonging to nine genera [Bastardiopsis (K. Schum.) Hassl., Byttneria Loefl., Ceiba Mill., Eriotheca Schott & Endl., Guazuma Adans., Helicteres L., Heliocarpus L., Luehea Willd. and Pseudobombax Dugand] in search for characters that can expand the knowledge on the pollen morphology of species of the family that occur in areas of fragments. The pollen grains were acetolyzed, measured, described and photographed under light microscopy and scanning electron microscopy. The species studied were grouped into two pollen types based mainly on the type of aperture [simple aperture (3-porate or 4-colpate) and compound aperture (3-pororate or 3-colporate)], and the quantitative data were analyzed using descriptive and multivariate statistics. Details of apertures (planaperturate, angulaperturate, type of endoaperture, costa, aspis and atrium) and exine ornamentation (verrucate, microreticulate, microreticulate-echinate, reticulate and bireticulate) contributed as secondary data to the segregation of species in an artificial pollen key. The metric characters examined by multivariate analysis allow the distinction of groups of species, based on the length of the apertures and the diameters of the pollen grains. Our results allow the identification among genera and species of Malvaceae s.l. in Brazilian forest fragments.

摘要

我们从属于九属的 Cerrado 森林碎片中分析了 13 种巴西本土锦葵科物种的花粉形态 [ Bastardiopsis ( K. Schum.) Hassl., Byttneria Loefl., Ceiba Mill., Eriotheca Schott & Endl., Guazuma Adans。 , Helicteres L., Heliocarpus L., Luehea Willd。和PseudobombaxDugand] 正在寻找可以扩展有关碎片区域中出现的科物种花粉形态知识的特征。在光学显微镜和扫描电子显微镜下对花粉粒进行乙酰化、测量、描述和拍照。研究的物种主要根据孔径类型分为两种花粉类型[简单孔径（3-porate或4-colpate）和复合孔径（3-pororate或3-colporate）]，并使用描述性分析定量数据和多元统计。孔的细节（平面孔、角孔、内孔类型、肋骨、尖刺和心房）和外壁装饰（疣状、微网状、微网状-棘状、网状和双网状）作为辅助数据有助于人工花粉键中的物种分离。通过多变量分析检查的度量特征允许根据孔的长度和花粉粒的直径来区分物种组。我们的结果允许鉴定锦葵科的属和种sl在巴西的森林碎片中。