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Pollen morphology of selected Brazilian species of Abolboda Humb. et Bonpl. (Xyridaceae): a statistical approach

2023; Taylor & Francis; Volume: 62; Issue: 4 Linguagem: Inglês

10.1080/00173134.2023.2244508

1651-2049

Cynthia Fernandes Pinto da Luz, Valéria Leobina dos Santos, Gisele de Oliveira Silva, Maria das Graças Lapa Wanderley,

Plant and Fungal Species Descriptions

AbstractPrevious studies on Abolboda pollen did not conduct statistical analyses of morphological data. Here, the pollen morphology of four Brazilian species and three varieties, represented by 13 herbarium specimens, is described. Pollen grains were treated by 60% lactic acetolysis, measured and photographed under light and scanning electron microscopy. A multivariate analysis was performed for the first time to find possible features that aid the specific and infraspecific delimitation within this genus. Abolboda is characterised by pollen grains in monads that are spheroidal, large to very large sized (59.9 µm [A. abbreviata] to 158.9 µm [A. pulchella]), inaperturate and atectate. The nexine is very thick. The spine shape and the width of its base have been considered specific and infraspecific diagnostic features; however, at present, they are not considered consistent characters with a systematic value. The combination of pollen size, nexine thickness, and dimensions of the sexine excrescences ('inverted funnelform shaped' spines, 'obconical shaped' spines, and baculum-like, pilum-like or verruca-like elements) are the most important characteristics at the species level and for grouping the varieties. This study presents informative morphological data useful for future phylogenetic optimisation and contributes to the systematics of the Abolboda genus.Keywords: AbolbodoideaemonocotyledonsPoalespollen characters AcknowledgementsThe authors are grateful to the curators of the Herbaria DIAM, INPA, MG and SP for providing herborised specimens. This article is dedicated to the memory of the second author, Me Valéria Leobina dos Santos, who left us very untimely.Disclosure statementNo potential conflict of interest was reported by the author(s).Specimens investigatedAbolboda abbreviata Malme. Brazil: Pará, Óbidos, Rio Jaramacarú, Egler W.A. 271, 27 May 1957 (MG 22345).Abolboda grandis Griseb var. grandis. Brazil: Amazonas, Manaus, Campina Tarumã-Mirim, 'Toca da onça', Krahl A.H 222, 11 July 2011 (INPA 243952).Abolboda macrostachya Spruce ex Malme. Brazil: Roraima, Caracaraí, Parque Nacional do Viruá, Silva G.O. 93, 10 October 2011 (INPA 241878). Brazil: Roraima, Caracaraí, Parque Nacional do Viruá, Barbosa T.M.B. 1055, 1 March 2010 (SP 445257/INPA 233111). Brazil: Roraima, Caracaraí, Parque Nacional do Viruá, Lins et al. 36, 17 October 2011 (INPA 241976). Brazil: Roraima, Caracaraí, Parque Nacional do Viruá, Calió M.F.A. 226, 12 September 2010 (SP 445255/INPA 236966).Abolboda poarchon Seub. Brazil: Minas Gerais, Diamantina, Pau-de-fruta/COPASA, Horak I. & Mendonça C.V., 23 October 2008 (DIAM). Brazil: Goiás, Cristalina, Kral R. & Wanderley M.G.L. 75300, 12 October 1988 (SP 234406).Abolboda poarchon var. intermedia. Brazil: Distrito Federal, Brasília, Córrego Taquara, Munhoz C., Rodrigues N. & Ramos K. 936, 9 March 2000 (SP 351325).Abolboda poarchon var. poarchon. Brazil: Minas Gerais, Joaquim Felício, Serra do Cabral, 'Morro da onça', Wanderley et al. 790, 6 July 1985 (SP 203683).Abolboda pulchella Bonpl. Brazil: Mato Grosso do Sul, Campo Grande, Silva G.O. et al. 159, 20 October 2012. Brazil: Mato Grosso do Sul, Costa Rica, Francener A. et al. 1202, 26 October 2012 (SP 445252). Brazil: Mato Grosso, Primavera do Leste, Kral R. & Wanderley M.G.L. 75168, 6 October 1988 (SP 234218).Additional informationFundingThis work was supported by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior' – Brazil (CAPES) (grant number PNADB AUXPE 23038.000037/2010-96) and by the Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) (grant numbers 2013/22881-9, 2015/15359-0, 2016/24015-5, 2017/50341-0). The authors also extend their thanks to the Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) for the fellowship of 'Productivity in research' to the first author (grant numbers 304271/2019-5, 307607/2022-4).