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Pollen Morphology of Some Cuban Guettarda Species

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Pollen Morphology of Some Cuban Guettarda Species This article was downloaded by: [200.196.73.69] On: 27 April 2013, At: 13:36 Publisher: Taylor & Francis Informa Ltd Registered in England and Wales Registered Number: 1072954 Registered office: Mortimer House, 37-41 Mortimer Street, London W1T 3JH, UK Grana Publication details, including instructions for authors and subscription information: http://www.tandfonline.com/loi/sgra20 Pollen morphology of some Cuban Guettarda species (Rubiaceae: Guettardeae) Lázara Sotolongo Molina , Maira Fernández Zequeira & Pedro Herrera Oliver Version of record first published: 05 Nov 2010. To cite this article: Lázara Sotolongo Molina , Maira Fernández Zequeira & Pedro Herrera Oliver (2002): Pollen morphology of some Cuban Guettarda species (Rubiaceae: Guettardeae), Grana, 41:3, 142-148 To link to this article: http://dx.doi.org/10.1080/001731302321042605 PLEASE SCROLL DOWN FOR ARTICLE Full terms and conditions of use: http://www.tandfonline.com/page/terms-and-conditions This article may be used for research, teaching, and private study purposes. Any substantial or systematic reproduction, redistribution, reselling, loan, sub-licensing, systematic supply, or distribution in any form to anyone is expressly forbidden. The publisher does not give any warranty express or implied or make any representation that the contents will be complete or accurate or up to date. The accuracy of any instructions, formulae, and drug doses should be independently verified with primary sources. The publisher shall not be liable for any loss, actions, claims, proceedings, demand, or costs or damages whatsoever or howsoever caused arising directly or indirectly in connection with or arising out of the use of this material. Grana 41: 142–148, 2002 Pollen morphology of some Cuban Guettarda species (Rubiaceae: Guettardeae) LA´ ZARA SOTOLONGO MOLINA, MAIRA FERNA´ NDEZ ZEQUEIRA and PEDRO HERRERA OLIVER Sotolongo Molina, L., Ferna´ndez Zequeira, M. & Herrera Oliver, P. 2002. Pollen morphology of some Cuban Guettarda species (Rubiaceae: Guettardeae). – Grana 41: 142–148. Pollen grains of 19 taxa of the genus Guettarda (Rubiaceae: Guettardeae) were studied using light microscopy, scanning electron microscopy (9 species), and fractured pollen grains (7 species). Most of the species have suboblate to oblate spheroidal, small to medium-sized grains with reticulate, microreticulate, perforate or foveolate exine. There is a great variability in the morphology of ectoapertures and endoapertures. Three pollen types are established, mainly based on differences in ectoapertures and sexine ornamentation. La´zara Sotolongo Molina, Mar´ga Ferna´ndez Zequeira & Pedro Herrera Oliver, Instituto de Ecolog´ga y Sistema´tica, Ministerio de Ciencia, Tecnologia y Medio Ambiente, Carretera de Varona Km 3/2 Capdevila Boyeros, Ciudad Habana, Cuba. E-mail: [email protected] (Manuscript received 14 June 2001; accepted 30 July 2002) The genus Guettarda L. (Cuban vernacular name: ‘‘cuero’’) Institute of Ecology and Systematics (Havana, Cuba) and the has over 85 species distributed in all tropical regions but Palynological Laboratory of the Swedish Museum of Natural mostly neotropical and notably abundant in the Antilles History (Stockholm, Sweden). (Alain 1964). There are 34 species in Cuba, 85% of which The terminology is basically in accordance with Punt et al. (1994) and Vezey & Skvarla (1994). are endemic (Borhidi et al. 1977). Being an extremely variable and heterogeneous group from a morphological standpoint, a RESULTS palynologic survey becomes necessary for clarifying both taxonomic position and relations. General features Using optic microscopy, pollen morphology of one specie Pollen grains 3-colporate or 3-pororate, small to medium not found in Cuba has been described by Mathew & Philip size. Suboblate or oblate spheroidal; polar outline (amb) (1983) who characterized Guettarda speciosa as 4/5 zono- circular, equatorial outline elliptical. Sexine microreticulate, porate, aspidate, with foveolate tectum. Roubik & Moreno reticulate, microperforate, perforate or foveolate. (1991) described pollen of Guettarda foliacea as inaperturate, reticulate, whereas Jung-Mendac¸olli & Melhem (1994) refer Pollen types the pollen of Guettarda viburnoides as oblate spheroidal, 2/3/4-porate, aspidate, with reticulate tectum. Type I (Figs. 1 – 4) Downloaded by [200.196.73.69] at 13:36 27 April 2013 Palacios-Chave´z et al. (1991) made a morphologic descrip- tion of pollen of two species, which are quite common in Pollen grains 3-colporate, small to medium in size. P: 22 – (26.5) – 31 m; E: 26 – (31.0) – 37 m. Suboblate; polar Cuba, Guettarda combsii and Guettarda elliptica nding m m differences between them with reference to the aperture outline (amb) circular (Fig. 1); equatorial outline elliptical. Ectocolpus relatively long (G. blodgettii) to very short and ornamentation of exine. (G. brevinodis). Endoaperture is an almost circular pore, This is the rst paper where the pollen morphology of Cuban Guettarda species is described. with costa endopori. Exine 3.0 – 4.3 mm thick; sexine semitectate-reticulate, heterobrochate (Fig. 2); lumina 1.0 – 5.0 mm in diameter; MATERIAL AND METHODS muri 1.0 – 2.0 mm wide, simplicolumellate; nexine thickened around endoapertures. The study was based on 19 species of the genus Guettarda. Pollen Species examined: G. blodgettii, G. brevinodis. was obtained from the Herbarium (HAC) of the Institute of Ecology and Systematics. G. blodgettii(Figs. 1 – 4). – Pollen grains 3-colporate, For light microscopy (LM), the material was acetolyzed (Erdtman small to medium in size. P: 25 – (26.7) – 30 mm; E: 1954, 1969; Nilsson & Praglowski 1992) and mounted in glycerine 30 – (32.1) – 35 mm. Suboblate; polar outline circular; equa- jelly. An Olympus BH-2 microscope was used for observation. torial outline elliptical. 10 (?) pollen grains of each sample were measured. Ectocolpus relatively long (Fig. 1). Endoaperture is a pore For scanning electron microscopy (SEM), acetolyzed material was dehydrated in a series of ethanol, mounted on lm and coated almost circular in shape with costa endopori; granules with gold palladium. Photomicrographs were obtained with a Jeol present on endoporus (Fig. 3). JSM 25 S-II electron microscope. Exine 3.0 – 4.3 mm thick; sexine semitectate-reticulate, The material studied is deposited in the actuopalynotheca of the heterobrochate; lumina 1.0 – 5.0 mm in diameter, irregular Grana 41 (2002) # 2002 Taylor & Francis. ISSN 0017-313 4 Pollen of Cuban Guettarda (Rubiaceae) 143 Downloaded by [200.196.73.69] at 13:36 27 April 2013 Figs. 1 – 4. Pollen of G. blodgettii: (1) oblique polar view, 3-colporate, reticulate pollen grain, 61600; (2) detail of reticulate exine, 64800; (3) Inside of pollen grain with granular nexine and endoporus with costa, 64800; (4) Cross-section of exine showing relatively long columellae, 61650. Pollen type I. Figs. 5 – 7. Pollen of G. ambigua: (5) equatorial view, 3-pororate reticulate pollen grain, 61350; (6) polar view, showing smooth muri and numerous processes in the lumina, 61400; (7) detail of perforate-foveolate exine, 66000. Pollen type II. Figs. 8 – 10. Pollen of G. calcicola: (8) polar view, 3-pororate, reticulate pollen grain, 62000; (9) Detail of reticulate exine, 65600; (10) Inside of pollen grain with granular nexine, endoporus with costa and cross section of pollen wall, 65200. Pollen type II. Figs. 11, 12. G. elegans: (11) polar view, 3-pororate, reticulate pollen grain, 61350; (12) detail of reticulate exine, muri beset with gran- ules on the surface, 64200; Pollen type II. in shape; muri 1.0 – 2.0 mm, simplicolumellate, with smooth Ectocolpus is very short. Endoaperture is an almost upper surface; inner nexine granular (Figs. 3, 4), thickened circular pore, with costa endopori. around endoapertures. Exine 3.0 – 4.0 mm thick; sexine semitectate-reticulate, heterobrochate; lumina 1.4 – 2.9 mm in diameter, irre- G. brevinodis. – Pollen grains 3-colporate, small to medium gular in shape; muri 1.0 mm, simplicolumellate, colu- in size. P: 22 – (24.6) – 26 mm; E 27 – (28.6) – 30 mm. Sub- mella diameter 51.0 mm; nexine thickened around oblate; polar outline circular; equatorial outline elliptical. endoapertures. Grana 41 (2002) 144 L. Sotolongo Molina et al Downloaded by [200.196.73.69] at 13:36 27 April 2013 Figs. 13, 14. G. elegans: (13) inside of pollen grain showing granular nexine, 61450; (14) cross section of exine showing endoporus with costa and long columellae, 64800. Pollen type II. Figs. 15 – 17. G. crassipes: (15) polar view, 3-pororate pollen grain, microreticulate ornamentation, 61450; (16) detail of perforate- foveolate exine, lumina with numerous processes and muri with granules, 64800; (17) Inside of pollen grain showing granular nexine and endoporus with costa, 61400. Pollen type II. Figs. 18 – 21. G. calyptrata: (18) equatorial view 3-pororate pollen grains, with a few perforations, 61700; (19) polar view, apoporium, 61400; (20) detail of exine and ectoaperture, 64200; (21) Inside of pollen grain with granular nexine and endoporus with costa, 63200. Pollen type III. Figs. 22, 23. G. ferruginea: (22) equatorial view, 3-pororate, perforate pollen grains, 61200; (23) Detail of exine with perforations, 64800. Pollen type III. Fig. 24. G. monocarpa. Equatorial view, 3-pororate, perforate pollen grain, 61100. Pollen type III. Type II (Figs. 5 – 17) Ectoporus diameter 1.9 – 5.4 mm, circular in shape. Endo- aperture is a circular pore. Pollen grains 3-pororate, small to medium in size. P: 21 – (30.3)– Exine 1.0 – 4.3 mm thick; sexine semitectate-reticulate or 41 mm; E: 24 – (34.1) – 46 mm. Suboblate to oblate-spheroidal; microreticulate, heterobrochate (Figs. 6, 9, 12 & 16); lumina polar outline (amb) circular (Figs. 6, 8, 11 & 15); equatorial 1.3 – 2.3 mm in diameter, irregular in shape; muri simplico- outline elliptical. lumellate; nexine thickened around endoapertures. Grana 41 (2002) Pollen of Cuban Guettarda (Rubiaceae) 145 Included species: G. ambigua, G. calcicola, G. cama- G. elegans (Figs. 11 – 14). – Pollen grains 3-pororate; gueyensis, G. coxiana, G. crassipes, G. elegans, G. elegans, medium size. P: 31 – (34.7) – 39 mm; E: 36 – (38.6) – 41 mm. G. lindeniana, G.
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