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The Diversity and Evolution of Pollination Systems in Annonaceae

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The Diversity and Evolution of Pollination Systems in Annonaceae bs_bs_banner Botanical Journal of the Linnean Society, 2012, 169, 222–244. With 1 figure The diversity and evolution of pollination systems in Annonaceae RICHARD M. K. SAUNDERS* School of Biological Sciences, The University of Hong Kong, Pokfulam Road, Hong Kong, China Received 9 May 2011; Revised 6 July 2011; accepted for publication 4 November 2011 The pollination biology of Annonaceae has received considerable attention, with data now available for > 45% of the genera (or genus-equivalent clades) included in recent molecular phylogenetic analyses. This provides a basis for understanding evolutionary shifts in the pollination system within the family. The present study focuses on subfamilies Anaxagoreoideae, Ambavioideae and Annonoideae, for which robust, well-resolved phylogenetic trees are available. Information is summarized on the pollination biology of individual clades and the evolutionary adaptations favouring different pollinator guilds evaluated. Although the majority of species of Annonaceae are pollinated by small beetles, five other pollinator groups are known: large beetles, thrips, flies, bees and cockroaches. Small-beetle pollination is inferred as the ancestral pollination system, with all other systems being derived. Evolutionary shifts to pollination by large beetles, thrips and flies are unlikely to have been significantly constrained by previous adaptations favouring pollination by small beetles, as many of the adaptations to these different pollinator guilds are similar (including protogyny, partially enclosed floral chambers and olfactory cues). In contrast, however, the evolutionary shift to bee pollination has presumably been constrained by both protogyny (as pollen-collecting bees are unlikely to visit pistillate-phase flowers) and the presence of floral chambers. © 2012 The Linnean Society of London, Botanical Journal of the Linnean Society, 2012, 169, 222–244. ADDITIONAL KEYWORDS: cantharophily – pollination ecology – reproductive biology. INTRODUCTION cockroaches (Nagamitsu & Inoue, 1997). There is therefore convincing evidence that many pollination Pollination systems in Annonaceae have received con- systems in Annonaceae are specialized at the pollina- siderable attention, particularly in the Neotropics. tor guild level. Published reports on the pollination biology of the Recently published molecular phylogenetic analy- family suggest that the majority of species are beetle ses of Annonaceae provide an ideal basis for investi- pollinated, with distinct small- and large-beetle pol- gating the evolution of pollination systems and lination systems (e.g. Gottsberger, 1999; Silberbauer- associated floral morphology. The most taxonomically Gottsberger, Gottsberger & Webber, 2003). Despite comprehensive of these analyses is that of Couvreur the prevalence of beetle pollination in the family, a et al. (2011), who adopted a supermatrix approach, diverse array of other insect guilds also act as polli- concatenating data from seven plastid markers (atpB- nators, including thrips (Gottsberger, 1970; Webber & rbcL, matK, ndhF, psbA-trnH, rbcL, trnS-trnG and Gottsberger, 1995; Küchmeister et al., 1998; Momose, trnL-trnF); this analysis included 93 of the 112 cur- Nagamitsu & Inoue, 1998a; Momose et al., 1998b; rently recognized genera (83%). Four main groups are Silberbauer-Gottsberger et al., 2003), flies (Gotts- consistently evident in published molecular phyloge- berger, 1985; Morawetz, 1988; Norman, Rice & netic analyses of the family, including that of Cou- Cochran, 1992; Su et al., 2005), bees (Olesen, 1992; vreur et al. (2011): the subfamily Anaxagoreoideae Carvalho & Webber, 2000; Silberbauer-Gottsberger (sensu Chatrou et al., 2012), consisting solely of the et al., 2003; Teichert, 2007; Teichert et al., 2009) and genus Anaxagorea St.Hil., sister to all other Annon- aceae; subfamily Ambavioideae (the ‘ambavioid’ clade, *E-mail: [email protected] consisting of nine genera: Ambavia Le Thomas, 222 © 2012 The Linnean Society of London, Botanical Journal of the Linnean Society, 2012, 169, 222–244 POLLINATION SYSTEMS IN ANNONACEAE 223 Cananga (DC.) Hook.f. & Thomson, Cleistopholis pollinators. The only floral visitors observed were Pierre ex Engl., Cyathocalyx Champ. ex Hook.f. & small weevils (Curculionidae), which were observed Thomson, Drepananthus Maingay ex Hook.f., Lettow- copulating in the flowers and laying eggs amongst ianthus Diels, Meiocarpidium Engl. & Diels, Mezzet- the staminodes. tia Becc. and Tetrameranthus R.E.Fr.); and two large sister clades, namely subfamily Annonoideae (for- merly known as the ‘long-branch clade’) and subfam- CLADE 1: ANAXAGOREA ily Malmeoideae (formerly the ‘short-branch clade’). Anaxagorea flowers are bisexual and consist of two Subfamily Malmeoideae are comparatively poorly whorls of valvate petals, which are generally fleshy. resolved, with numerous polytomies and weakly sup- The inner petals are almost equal or slightly shorter ported clades. Any attempt at interpreting evolution- than the outer petals and are apically connivent over ary changes in reproductive characters in this clade is the reproductive organs during the reproductively unlikely to be reliable and, for this reason, the active phases, forming a pollination chamber. present study focuses on subfamilies Anaxagore- The reproductive biology of the genus is compara- oideae, Ambavioideae and Annonoideae. The large tively well investigated, with studies of six species genera Annona L. (c. 200 species, including Rollinia (A. brevipes Benth., A. crassipetala Hemsl., A. doli- A.St.-Hil.: Rainer, 2007) and Uvaria L. (c. 210 species, chocarpa Sandwith & Sandwith, A. manausensis Tim- including Anomianthus Zoll., Balonga Le Thomas, merman, A. phaeocarpa Mart., and A. prinoides Cyathostemma Griff., Dasoclema J.Sinclair, Ellipeia St.Hil. & A.DC.: Bawa et al., 1985; Maas-van de Hook.f. & Thomson, Ellipeiopsis R.E.Fr. and Rauwen- Kamer, 1993; Armstrong & Marsh, 1997; Küchmeister hoffia Scheff.: Zhou, Su & Saunders, 2009, Zhou et al., et al., 1998; Jürgens, Webber & Gottsberger, 2000; 2010) show a diversity of floral structures and polli- Webber, 2002; Teichert, 2007; Braun, 2010; Teichert, nation systems. This variation has been accommo- Dötterl & Gottsberger, 2011). Flowers of all these dated in the present study by interpolating topologies species are visited by small diurnal beetles (Nitidul- from species-level phylogenetic studies of Annona (H. idae and, to a lesser extent, Staphylinidae). The Rainer, unpubl. data) and Uvaria (Zhou et al., 2009, flowers are protogynous, with a 2-day diurnal rhythm 2010, 2012) into the phylogenetic analyses published (i.e. the pistillate and then staminate phases cover a by Couvreur et al. (2011). The various pollinator 2-day period); in several species, there is evidence guilds observed in each clade (Table 1) were mapped that the pistillate and staminate phases are tempo- as an unordered character on the combined topology rally separated overnight to prevent autogamy (Arm- (Fig. 1) using Mesquite ver. 2.73 (Maddison & Maddi- strong & Marsh, 1997; Jürgens et al., 2000). There is son, 2010). Eupomatia R.Br. (Eupomatiaceae) was evidence of heterodichogamy in A. prinoides, with the included as an outgroup for comparative purposes as occurrence of pistillate-phase and staminate-phase it has repeatedly been shown to be sister to Annon- flowers synchronized between individuals, thereby aceae (e.g. Qiu et al., 2005). promoting xenogamy (Teichert et al., 2011); this was not observed, however, in A. dolichocarpa (Braun, 2010). Sterile staminodes act as a physical barrier to POLLINATION SYSTEMS IN the transfer of pollen in several species, by elongating and essentially covering the stigmas towards the end INDIVIDUAL CLADES of the pistillate phase (A. brevipes: Webber, 2002; OUTGROUP: EUPOMATIA (EUPOMATIACEAE) A. dolichocarpa: Maas-van de Kamer, 1993; Braun, The pollination biology of Eupomatia laurina Hook. 2010; A. javanica Blume: Corner, 1988). has been reported by Hamilton (1897), Endress The flowers emit a fruity odour at anthesis (corre- (1984) and Armstrong & Irvine (1990). The flowers lated with the pistillate and staminate reproductive are hermaphroditic and are markedly protogynous, phases) and are thermogenic (c. 1.5–5.5 °C above with a 12- to 24-h separation between the pistillate ambient levels, depending on species: Küchmeister and staminate phases. The flowers lack any peri- et al., 1998; Jürgens et al., 2000; Braun, 2010). The anth; the androecium consists of numerous, spirally beetles appear to be rewarded by copious stigmatic arranged stamens towards the outside of the flower, exudate during the pistillate phase (Maas-van de and numerous petaloid sterile staminodes towards Kamer, 1993; Armstrong & Marsh, 1997) and pollen the centre. The staminodes perform several func- during the staminate phase (Braun, 2010), although tions, including the emission of scent from osmo- there is no evidence that the flowers act as a brood phores, and as a food reward in the form of the soft site for the beetles (Armstrong & Marsh, 1997; Braun, staminode apex and sticky exudate (Endress, 1984; 2010). Anaxagorea does not appear to possess a bio- Armstrong & Irvine, 1990). The staminodes also chemical self-incompatibility mechanism (Bawa et al., form a loose pollination chamber that shelters the 1985; Armstrong & Marsh, 1997; Braun, 2010). © 2012 The Linnean Society of London, Botanical Journal of the Linnean Society, 2012, 169, 222–244 224 R. M. K. SAUNDERS Table 1. Presence (•) and absence (᭺) of different
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