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Characteristics of the exine and aperture of pollen grains of Eriosema and Rhynchosia (Leguminosae – Papilionoideae – Phaseoleae)
Grana ( IF 0.9 ) Pub Date : 2019-06-10 , DOI: 10.1080/00173134.2019.1600576
Ana Carla Da Silva Oliveira 1 , Ricardo Landim Bormann De Borges 2 , Ana Paula Fortuna Perez 3 , Gwilym Peter Lewis 4 , Juliana Santos Silva 1
Affiliation  

Abstract The genera Eriosema and Rhynchosia, which comprise approximately 150 and 230 species, respectively, belong to the tribe Phaseoleae and to the subtribe Cajaninae. The pollen morphology of 49 species of Eriosema and 13 of Rhynchosia were studied using scanning electron microscopy to identify diagnostic characteristics that could aid in the taxonomic circumscription of those genera. The pollen grains analysed were obtained from specimens deposited in the BOTU, CEPEC, IPA, HRB, HUEFS, OUPR, P, S, UFC, and UFRJ herbaria. The species studied demonstrated that the pollen grains dispersed in monads, are isopolar or heteropolar, triporate or tricolporate, angulaperturate; with the endo-aperture membrane generally psilate and the exine largely reticulate heterobrocate, except for R. claussenii which is microreticulate. We discuss these diverse characteristics, including the ornamentation of the endo-aperture membrane and the margins of the apertures and reticula, to obtain information that possibly could be used to differentiate between the two genera. Although this proved not to be possible using pollen, because many characters overlap between the two genera, nevertheless some species display unique, taxonomically useful, characters, such as R. platyphylla which has an apocolpium in the shape of a ‘Y’, E. bauchiense with a verrucate exine ornamentation, and E. benthamianum with fossulate lumina. Additionally, two pollen types were identified in Eriosema, one group of species with 3-porate pollen grains and the other composed of species with 3-colporate grains.

中文翻译:

Eriosema 和 Rhynchosia(豆科-蝶形花科-菜豆科)花粉粒外壁和孔径的特征

摘要 Eriosema 和Rhynchosema 属分别包含约150 和230 种,分别属于菜豆族和木豆亚族。使用扫描电子显微镜研究了 49 种 Eriosema 和 13 种 Rhynchosia 的花粉形态,以确定有助于这些属的分类范围的诊断特征。分析的花粉粒取自 BOTU、CEPEC、IPA、HRB、HUEFS、OUPR、P、S、UFC 和 UFRJ 植物标本馆的标本。研究的物种表明,分散在单子中的花粉粒是等极或异极的,三孔或三孔的,有角的;内孔膜通常为psilate,外壁大部分为网状异溴酸盐,但R. claussenii 除外,它是微网状的。我们讨论了这些不同的特征,包括孔内膜的装饰以及孔和网状结构的边缘,以获得可能用于区分这两个属的信息。尽管使用花粉证明这是不可能的,因为两个属之间的许多特征重叠,但是一些物种显示出独特的、在分类学上有用的特征,例如具有“Y”形状的尾端的 R. platyphylla,E. bauchiense 有疣状外壁装饰,E. bethamianum 有窝状腔。此外,在 Eriosema 中鉴定出两种花粉类型,一组具有 3 孔花粉粒,另一组由具有 3 孔花粉粒的物种组成。包括孔内膜的装饰以及孔和网状结构的边缘,以获得可能用于区分两个属的信息。尽管使用花粉证明这是不可能的,因为两个属之间的许多特征重叠,但是一些物种显示出独特的、在分类学上有用的特征,例如具有“Y”形状的尾端的 R. platyphylla,E. bauchiense 有疣状外壁装饰,E. bethamianum 有窝状腔。此外,在 Eriosema 中鉴定出两种花粉类型,一组具有 3 孔花粉粒,另一组由具有 3 孔花粉粒的物种组成。包括孔内膜的装饰以及孔和网状结构的边缘,以获得可能用于区分两个属的信息。尽管使用花粉证明这是不可能的,因为两个属之间的许多特征重叠,但是一些物种显示出独特的、在分类学上有用的特征,例如具有“Y”形状的尾端的 R. platyphylla,E. bauchiense 有疣状外壁装饰,E. bethamianum 有窝状腔。此外,在 Eriosema 中鉴定出两种花粉类型,一组具有 3 孔花粉粒,另一组由具有 3 孔花粉粒的物种组成。尽管使用花粉证明这是不可能的,因为两个属之间的许多特征重叠,但是一些物种显示出独特的、在分类学上有用的特征,例如具有“Y”形状的尾端的 R. platyphylla,E. bauchiense 有疣状外壁装饰,E. bethamianum 有窝状腔。此外,在 Eriosema 中鉴定出两种花粉类型,一组具有 3 孔花粉粒,另一组由具有 3 孔花粉粒的物种组成。尽管使用花粉证明这是不可能的,因为两个属之间的许多特征重叠,但是一些物种显示出独特的、在分类学上有用的特征,例如具有“Y”形状的尾端的 R. platyphylla,E. bauchiense 有疣状外壁装饰,E. bethamianum 有窝状腔。此外,在 Eriosema 中鉴定出两种花粉类型,一组具有 3 孔花粉粒,另一组由具有 3 孔花粉粒的物种组成。
更新日期:2019-06-10
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