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Pollen Morphology of the Tribes Naucleeae and Hymenodictyeae (Rubiaceae – Cinchonoideae) and Its Phylogenetic Significance

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Pollen Morphology of the Tribes Naucleeae and Hymenodictyeae (Rubiaceae – Cinchonoideae) and Its Phylogenetic Significance Blackwell Publishing LtdOxford, UKBOJBotanical Journal of the Linnean Society0024-40742007 The Linnean Society of London? 2007 1533 329341 Original Article POLLEN MORPHOLOGY OF NAUCLEEAE AND HYMENODICTYEAEJ. VERELLEN ET AL . Botanical Journal of the Linnean Society, 2007, 153, 329–341. With 24 figures Pollen morphology of the tribes Naucleeae and Hymenodictyeae (Rubiaceae – Cinchonoideae) and its phylogenetic significance JEF VERELLEN1, STEVEN DESSEIN1,3, SYLVAIN G. RAZAFIMANDIMBISON2, Downloaded from https://academic.oup.com/botlinnean/article/153/3/329/2420406 by guest on 24 September 2021 ERIK SMETS FLS1,4 and SUZY HUYSMANS1* 1Laboratory of Plant Systematics, Institute of Botany and Microbiology, K.U.Leuven, Kasteelpark Arenberg 31, BE-3001 Leuven, Belgium 2National Botanic Garden of Belgium, Domein van Bouchout, BE-1860 Meise, Belgium 3The Bergius Foundation at the Royal Swedish Academy of Sciences, P.O. Box 50017, SE-104 05 Stockholm, Sweden 4National Herbarium of the Netherlands, Leiden University Branch, P.O. Box 9514, 2300 RA Leiden, the Netherlands Received March 2006; accepted for publication September 2006 The tribe Naucleeae has recently been recircumscribed on the basis of both morphological and molecular [rbcL, trnT- F, internal transcribed spacer (ITS)] evidence, and has been found to be the sister group of the tribe Hymenodictyeae Razafim. & B. Bremer. In order to find pollen morphological support for this new classification, the pollen and orb- icules of 65 species, representing 23 Naucleeae and the two Hymenodictyeae genera, were investigated by scanning electron and light microscopy. Naucleeae pollen is very small (< 20 µm) to small (20–30 µm) and its shape in equatorial view is suboblate to spheroidal or, more rarely, subprolate. Three compound apertures are present, each comprising a long and narrow ectocolpus, a circular to slightly lolongate mesoporus, and an often H-shaped endoap- erture. The sexine ornamentation is perforate, rugulate, or (micro)reticulate, and supratectal elements are always absent. Apart from the variation in sexine ornamentation, the tribe is rather stenopalynous. The pollen of Hymen- odictyeae is very similar to that of Naucleeae. The H-shaped endoapertures often observed probably form a syna- pomorphy for the clade comprising Naucleeae and Hymenodictyeae. Our pollen morphological observations are not in conflict with the widened delimitation of Naucleeae. Unambiguous pollen support for the recent subtribal or generic concepts of Naucleeae could not be found because of a lack of variation of pollen characters within the tribe. Orbicules are invariably present in the ten Naucleeae taxa investigated. They are spheroidal and smooth or irreg- ularly folded. © 2007 The Linnean Society of London, Botanical Journal of the Linnean Society, 2007, 153, 329–341. ADDITIONAL KEYWORDS: compound apertures – endoapertures –– orbicule morphology – palynology – sexine ornamentation. INTRODUCTION occur in Central, North, and South America. Members of Naucleeae are morphologically well recognizable by Naucleeae, as circumscribed by Razafimandimbison & the many-flowered globose inflorescences and the epi- Bremer (2002), is a mainly palaeotropical tribe of the gynous floral nectaries deeply embedded in hypanthia subfamily Cinchonoideae (Rubiaceae) comprising 26 (Bremer, Andreasen & Olsson, 1995; Razafimandimbi- genera and c. 180 species. The tribe’s highest diversity son & Bremer, 2001, 2002; Razafimandimbison, 2002). is found in South-east Asia, followed by Madagascar Naucleeae is sister to the tribe Hymenodictyeae and Africa. Only five species, representing two genera, Razafim. & B. Bremer (Razafimandimbison & Bremer, 2001). Razafimandimbison & Bremer (2001) described *Corresponding author. the latter tribe to accommodate the genera Hymenod- E-mail: [email protected] ictyon Wall. and Paracorynanthe R. Capuron, previ- © 2007 The Linnean Society of London, Botanical Journal of the Linnean Society, 2007, 153, 329–341 329 330 J. VERELLEN ET AL. ously placed by Andersson & Persson (1991) in their Hymenodictyeae. This article addresses the following polyphyletic tribe Coptosapelteae. These genera differ questions: (1) are the new delimitation of Naucleeae from the Naucleeae genera in having elongate inflo- (sensu Razafimandimbison & Bremer, 2002) and the rescences and lenticellate capsular fruits containing sister group relationship between Naucleeae and bilaterally flattened, elongate, accrescent placentas Hymenodictyeae supported by pollen data?; (2) are (S.G. Razafimandimbison & B. Bremer, unpubl. data). there any pollen morphological synapomorphies for The Naucleeae–Hymenodictyeae clade forms the sis- the seven subtribes proposed by Razafimandimbison ter group to the rest of Cinchonoideae (Andersson & & Bremer (2002)?; and (3) are the newly proposed Antonelli, 2005). generic circumscriptions supported by pollen The results of the phylogenetic studies by Razafi- morphology? mandimbison & Bremer (2001, 2002), based on molec- Downloaded from https://academic.oup.com/botlinnean/article/153/3/329/2420406 by guest on 24 September 2021 ular [internal transcribed spacer (ITS), rbcL, and MATERIAL AND METHODS trnT-F] and morphological data, strongly suggested a much broader circumscription for Naucleeae than pre- This study is based on the examination of 123 speci- viously proposed, including all members of Naucleeae mens, encompassing 65 species belonging to 25 genera sensu Ridsdale (1978), together with Cephalanthus L., of Naucleeae and Hymenodictyeae. Some of these Hallea J.-F. Leroy, Mitragyna Korth., Uncaria Schreb. observations were extracted from the Master’s thesis (as shown by Bremer et al., 1995), and also Corynan- of Huysmans (1993); in the material list, these sam- the Welw. and Pausinystalia Pierre ex Dupouy & ples are indicated with an asterisk. Mitragyna s.l. Beille. Their analyses also showed that Naucleeae can (Hallea J.-F. Leroy included) was not investigated be subdivided into six highly supported and morpho- here, as extensive pollen data of Mitragyna s.s. and logically distinct subtribes: Breoniinae, Cephalanthi- Hallea were published by Huysmans et al. (1994). No nae, Corynantheinae, Naucleinae, Mitragyninae, and pollen observations were made for Diyaminauclea Uncarinae. A seventh subtribe, the Adininae, was only Ridsdale and Khasiaclunea Ridsdale as suitable mate- poorly supported. Razafimandimbison & Bremer rial was lacking. Pollen samples were taken from spec- (2002) also proposed changes to the delimitation of imens from the following herbaria: A, AS, BR, L, MO, some of the Naucleeae genera. Corynanthe was P, S, TAN, and TEF (abbreviations according to restricted to Corynanthe paniculata Welw., the other Holmgren, Holmgren & Barnett, 1990). The identifi- species of the genus being transferred to the rein- cations of all specimens used were verified. stated genus Pseudocinchona A. Chev. ex Perrot. All specimens were acetolysed following Reitsma’s Hallea J.-F. Leroy (Leroy, 1975) was merged with (1969) ‘wetting agent’ method. Prior to acetolysis Mitragyna, and Neobreonia Ridsdale with Breonia A. (10 min in a heating block at 90 °C), flowers were Rich. The generic delimitations and infratribal taxa hydrated in an Agepon solution (1 : 200) and dehy- adopted here are as circumscribed by Razafimandim- drated in pure acetic acid. After acetolysis, the pollen bison & Bremer (2002). sample from each specimen was split into two subsam- The pollen morphology of Naucleeae and Hymenod- ples, one part for light microscopy (LM) and the other ictyeae is very poorly documented. Only the pollen of for scanning electron microscopy (SEM) observations Hallea and Mitragyna has been studied extensively. and storage. Pollen for SEM was rinsed in 70% etha- Leroy (1975) segregated the genus Hallea from nol, mounted on a stub, air-dried, and coated with gold Mitragyna, partly on the basis of palynological evi- for 2 min using a SPI-Module™ sputter coater. Pollen dence from only two species. This study was later elab- grains were broken by adding small glass beads to the orated by Huysmans, Robbrecht & Smets (1994), who pollen suspension and shaking it with a vortex, as studied the pollen of all ten species of Hallea and described by Huysmans et al. (1994). Digital images Mitragyna. They concluded that Hallea and Mitrag- were taken with a Jeol JSM 5800 scanning electron yna could not be split on the basis of pollen morphol- microscope. Grains for LM studies were mounted in ogy, although they accepted the separation on the Kaiser’s glycerine jelly and sealed with paraffin. The basis of other morphological evidence. slides were observed using a Leitz Dialux 20 light As pollen morphology has been proven to provide microscope with a ×100 oil immersion lens. useful taxonomic characters in other groups of Rubi- In order to check for the possible presence of orbi- aceae (for example, Johansson, 1992; Andersson, cules on the inner locule wall of the anthers, entire 1995; Rova & Andersson, 1995; Andreasen & Bremer, anthers were critically point dried (Balzers, CPD 030) 1996; Delprete, 1996; De Block & Robbrecht, 1998; after hydration in Agepon solution and dehydration in Huysmans, Robbrecht & Smets, 1998; Huysmans an acetone series. The dried, entire anthers were et al., 1999; Dessein et al., 2002, 2005a), we decided mounted on stubs with double adhesive carbon strips to conduct a thorough investigation of the pollen and before further preparation. If undehisced, a longitudi- orbicule morphologies of Naucleeae and its sister nal
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