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Research Article

Pollen morphology, ultrasculpture and ultrastructure of Poiretia Vent. (Leguminosae – Papilionoideae – Dalbergieae – Adesmia informal clade)

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Pages 8-26 | Received 17 Sep 2020, Accepted 28 Jul 2021, Published online: 18 Jan 2022
 

Abstract

Pollen morphology, ultrasculpture and ultrastructure were investigated for Poiretia in search of morphological characters of taxonomic importance using light microscopy as well as scanning and transmission electron microscopy. Additionally, principal components analysis was done to elucidate patterns of variation among the species. Pollen grains are small to medium size, isopolar, prolate spheroidal to prolate, 3-zonocolporate, colporus with operculum, membrane and margo are ornamented. Five pollen types are recognised and described based on mesocolpium exine ultrasculpture. Exine consists of a compact tectum, eutectate, tectate perforate to semitectate, the infratectum is collumelar and granular, foot layer discontinuous to absent in aperture region and endexine is continuous. A comprehensive description of the operculum, membrane ornamentations and the ultrastructure of exine were given for all species in the genus, nine of which were not previously analysed palynologically. Systematic implications of the palynological variations found in the literature and through light, scanning and transmission electron microscopical analyses were discussed. This article describes the importance of the characterisation of Poiretia pollen grains, which contributes to the systematics of the Adesmia informal clade. The class of endoaperture, ultrasculpture of mesocolpium and apocolpium, and ultrastructure of tectum, foot layer, and endexine support the eurypalynous status of Poiretia and are useful to recognise some species that have problematic delimitation (P. latifolia, P. coriifolia, P. unifoliolata, P. mattogrossensis, P. elegans, P. marginata) as well as groups of species.

Acknowledgements

The authors are grateful to Me. Katiane Reis Mendes of the Graduate Programme in Biological Sciences (Botany), UNESP – São Paulo State University, for the taxonomic assistance of the genus. The authors also thanks ‘Laboratório de Microscopia Eletrônica, Escola Superior de Agricultura Luiz de Queiroz, Universidade de São Paulo’ coordinated by Prof. Dr Elliot Watanabe Kitajima, who made available the scanning electron microscope and ‘Centro de Microscopia e Imagem, Faculdade de Odontologia de Piracicaba, Universidade de Campinas’ coordinated by Prof. Dr Pedro Duarte Novaes, for the use of the transmission electron microscope.

Disclosure statement

No potential conflict of interest was reported by the author(s).

Specimens investigated

Poiretia angustifolia Vogel. Brazil: Distrito Federal, Brasília, Universidade de Brasília. H.S. Irwin et al. 11 083 7 December 1965 (NY 1522912); Brazil: São Paulo, São Paulo, Jabaquara. O. Handro 19, 28 November 1948 (K 908304); Brazil: São Paulo, São Paulo, Ipiranga. F.C. Hoehne s.n., 12 December 1918 (SP 2624); Brazil: Distrito Federal, Brasília, Peninsula Norte, Lago Paranoá. F.H.F. Oldenburger & V.V. Mecenas 2068, 30 November 1975 (SP 249004); Brazil: Paraná, Ponta Grossa, Parque Vila Velha. G. Hatschbach 13 106, 8 November 1965 (K 908308).

Poiretia bahiana Müll. Hal. Brazil: Bahia, Lençóis, Rodovia Brasília-Fortaleza (BR-242). L. Coradin et al. 6524, 5 July 1983 (K 92193); Brazil: Bahia, Mucugê. M.M. Pignal 3196.0, 15 June 2008 (NY 1281375). Brazil, Bahia, Lençois. R.M. Harley et al. 22 683, 27 May 1980 (K 92198).

Poiretia coriifolia Vogel. Brazil: Distrito Federal, Alto do Paraíso, Chapada dos Veadeiros. H.S. Irwin et al. 32944a, 22 March 1981 (NY 1522983); Brazil: São Paulo, Mogi Guaçu, Reserva Biológica da Fazenda Campininha. W. Mantovani & M. Sugiyama 1636, 27 January 1981 (SP 168764). Brazil: Minas Gerais, Belo Horizonte, Serra do Curral. M. Barreto 5463, 7 February 1933 (SP 37749).

Poiretia crenata Cl. Müll. Brazil: Mato Grosso do Sul, Camapuã, BR-163. W.R. Anderson 11 239, 7 February 1975 (NY 605453).

Poiretia elegans Müll. Hal. Brazil: Minas Gerais, Felisberto Caldeira, Curtidor. G.G. Hatschbach 31 684.0 16 February 1973 (NY 1523018). Brazil: Goiás Cavalcante, Chapada dos Veadeiros. H.S. Irwin et al. 24 134, 9 March 1969 (NY 1522958). Brazil: Minas Gerais, Rio Manso e Couto de Magalhães. W.R. Anderson et al. 8735, 13 March 1973 (K 908320).

Poiretia latifolia Vogel. Brazil: Rio Grande do Sul, Caxias do Sul, Apanhador-Vila Seca. L. Scur 208, 1 December 1999 (NY 605451). Paraguay: Reserva Biológica Tati Yupi, Schinini 26 904 (NY)*.

Poiretia longipes Harms. Brazil: Mato Grosso do Sul, Costa Rica, Fazenda Santo Antônio do Pontal. A. Pott 11 613, 1 April 2004 (CGMS 13249).

Poiretia marginata Cl. Mull. Brazil: Minas Gerais, Frutal, BR 153. A. Krapovickas 33 077, 19 January 1978 (NY 1523060); Brazil: Minas Gerais, Ituiutaba. A. Macedo 1614, 6 February 1949 (NY 1523059).

Poiretia mattogrossensis Müll. Hal. Brazil: Mato Grosso, Xavantina. H. S. Irwin 17 343, 17 June 1966 (NY1522930); Brazil: Mato Grosso, Xavantina, Serra do Roncador. H.S. Irwin et al. 16 666, 6 June 1966 (NY 1522927).

Poiretia punctata (Willd.) Desv. Brazil: Bahia, Manoel Vitorino. L.A. Mattos Silva et al. 292, 16 February 1979 (K 92210). Ecuador: Provincia de Loja, Sacapalca. G.P. Lewis et al. 3279, 15 May 1997 (MO 3213860); Brazil: Minas Gerais, Santana do Riacho, Serra do Cipo. A.M. Giulietti et al. CFSC7780, 16 February 1982 (SP 175950); Brazil, São Paulo, Itirapina. G. Gehrt s.n., 29 April 1923 (SP 8333); Brazil: Minas Gerais, Santa Luzia, Fazenda do Cipó. M. Barreto 5696, 13 January 1934 (SP 37753); Mexico: Chiapas, Cintalapa. D.E. Breedlove 20 650, 16 October 1971 (NY)*.

Poiretia tetraphylla (Poir.) Burkart. Brazil: Mato Grosso, Barra do Garças. D. Philcox & J. Bertoldo 4004, 13 January 1968 (K 908390); Brazil: Rio Grande do Sul, Porto Alegre. B. Rambo 40 410, 5 March 1949 (SP 59801); Brazil: Rio Grande do Sul, São Sebastião do Caí, Capela. B. Rambo & J. Dutra 1909, 24 April 1935 (SP 51092); Argentina: Tancacha, Rio Córdoba. A.C. Scala s.n., December 1924 (SP 38952).

Poiretia unifoliolata Barreto ex Martins & Pedersoli. Brazil: Minas Gerais, Santana do Riacho, Córrego Chapeu do Sol. I. Cordeiro & J.R. Pirani CFSC6497, 3 September 1980 (SP 179561); Brazil: Minas Gerais, Santana do Riacho, Serra das Bandeirinhas. T.B. Cavalcanti et al. CFSC10652, 9 September 1987 (SP 225016).

* Specimen used for illustrations

Additional information

Funding

This study was financed in part by the ‘Coordenação de Aperfeiçoamento de Pessoal de Nível Superior’ – Brazil (CAPES) – [process no. 88882.444252/2019-01], awarded to HAD; and by the ‘Conselho Nacional de Desenvolvimento Científico e Tecnológico’ (CNPq), through Research Productivity Fellowships awarded to CFPL [process no. 304271/2019-5] and APM [process no. 312602/2091-7]. APFP thanks FAPESP [process no. 2015/13386-0], CNPq [process no. 457911/2013-1; 400567/2016-4] and CAPES Print [process 8887.373155/2019-00, code 001] for funding a collecting expedition in Brazil and study visits to analyse samples in national and international herbaria;CAPES [88882.444252/2019-01, 8887.373155/2019-00 code 001].

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