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Phylogenetic Relationships of Functionally Dioecious Ficus (Moraceae) Based on Ribosomal Dna Sequences and Morphology1

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Phylogenetic Relationships of Functionally Dioecious Ficus (Moraceae) Based on Ribosomal Dna Sequences and Morphology1 American Journal of Botany 87(9): 1342±1357. 2000. PHYLOGENETIC RELATIONSHIPS OF FUNCTIONALLY DIOECIOUS FICUS (MORACEAE) BASEDONRIBOSOMAL DNA SEQUENCES AND MORPHOLOGY1 GEORGE D. WEIBLEN2 Harvard University Herbaria, 22 Divinity Avenue, Cambridge, Massachusetts 02138 USA Figs (Ficus, Moraceae) are either monoecious or gynodioecious depending on the arrangement of unisexual ¯orets within the specialized in¯orescence or syconium. The gynodioecious species are functionally dioecious due to the impact of pollinating ®g wasps (Hymenoptera: Agaonidae) on the maturation of ®g seeds. The evolutionary relationships of functionally dioecious ®gs (Ficus subg. Ficus) were examined through phylogenetic analyses based on the internal transcribed spacer (ITS) region of nuclear ribosomal DNA and morphology. Forty-six species representing each monoecious subgenus and each section of functionally dioecious subg. Ficus were included in parsimony analyses based on 180 molecular characters and 61 morphological characters that were potentially infor- mative. Separate and combined analyses of molecular and morphological data sets suggested that functionally dioecious ®gs are not monophyletic and that monoecious subg. Sycomorus is derived within a dioecious clade. The combined analysis indicated one or two origins of functional dioecy in the genus and at least two reversals to monoecy within a functionally dioecious lineage. The exclusion of breeding system and related characters from the analysis also indicated two shifts from monoecy to functional dioecy and two reversals. The associations of pollinating ®g wasps were congruent with host ®g phylogeny and further supported a revised classi®cation of Ficus. Key words: breeding system evolution; coevolution; dioecy; Ficus; Moraceae; phylogeny; pollination. The genus Ficus (Moraceae) includes some 750 species of the nature and extent of coevolution involved (Ramirez, 1974; woody plants occurring in most tropical and subtropical forests Wiebes, 1979). Functionally dioecious ®gs are of special in- throughout the world (Berg, 1989). These species of trees, terest due to evolutionary con¯icts with pollinators regarding shrubs, climbers, and hemiepiphytic stranglers are recognized the exploitation of seed resources (Grafen and Godfray, 1991). by a specialized in¯orescence and pollination syndrome (Jan- Until the present, our knowledge of ®g breeding system evo- zen, 1979; Berg, 1990b). Resembling a ¯eshy fruit, the ®g is lution has been shaped by taxonomy (Corner, 1985), anatomy an enlarged receptacle enclosing many unisexual ¯owers that (Beck and Lord, 1988; Verkerke, 1989), ecology (Galil, 1973; are accessible only by a tightly bract-®lled opening or ostiole. Kjellberg et al., 1987; Corlett, 1993; Weiblen, Spencer, and The closed in¯orescence, or syconium, protects the ¯owers Flick, 1995; Patel and McKey, 1998), and pollinator behavior against most parasites except for diminutive insects capable of (Hossaert-McKey, Gibernau, and Frey, 1994; Ware and Comp- entering through the opening (Berg, 1990a). The interior of ton, 1994). However, phylogenetic studies are few, and the the in¯orescence is the location of an obligate mutualism with relationships of the functionally dioecious ®gs have not been pollinating seed predators, ®g wasps in the family Agaonidae examined in detail (Yokoyama, 1995; Herre et al., 1996). of parasitic Hymenoptera (Chalcidoidea). Interactions between Morphologically, ®gs are monoecious or gynodioecious ac- ®gs and ®g wasps are among the best known examples of cording to the representation of the unisexual ¯orets within the reproductive interdependence between plants and their polli- syconium (Figs. 1±3). The gynodioecious species are func- nators (Bronstein, 1992). In addition, ®g wasps are specialized tionally dioecious, with the separation of sexual function re- to the extent that unique pollinator species are associated with sulting from the interaction of pollinator wasps with ¯orets in most ®g species (Ramirez, 1970; Wiebes, 1979; but see Ras- two types of ®gs on separate plants (Weiblen, Spencer, and plus, 1994, 1996; Kerdelhue, Hochberg, and Rasplus, 1997). Flick, 1995). Inside the protogynous syconia, female ®g wasps The intertwined life cycles of ®gs and pollinators, together deliver pollen to the pistillate ¯orets while laying their eggs with their extreme speci®city, are the basis for speculation on in a fraction of ®g ovaries. The fate of the ovaries in these species is in¯uenced by the interaction of pollinator oviposi- 1 Manuscript received 27 July 1999; revision accepted 16 December 1999. The author thanks C. Berg, S. Davies, M. Donoghue, E. Kellogg, D. P®ster, tors with dimorphic pistillate ¯orets in the two types of ®gs P. Stevens, and an anonymous reviewer for commenting on earlier drafts of (Ganeshaiah et al., 1995). Long-styled ¯orets in seed ®gs (Fig. the manuscript; D. Ferguson for help with phylogenetic analysis, F. Harrington 1) have ovaries that are fertilized but are inaccessible to pol- for laboratory assistance; C. Kerdelhue, H. Spencer, and B. Flick for providing linator ovipositors (Galil, 1973). On the other hand, short- collections; the Indonesian Institute of Sciences (LIPI) and John Burley for styled ¯orets in gall ®gs (Fig. 2) enable pollinators to deposit sponsoring research in Indonesia; the National Research Institute of Papua New Guinea (PNG), the Christensen Research Institute, and L. Orsak for their eggs in proximity to ®g ovules (Verkerke, 1989). Wasp facilitating research in PNG; and B. Isua, U. Koil, M. Soru, C. Dal, A. Kin- larvae occupy the ovaries and feed on endosperm. Later in abel, R. Nangui, M. Evans, V. Novotny, Y. Basset, T. Laman, and I. Rachman development, staminate ¯orets in gall ®gs release pollen dur- for ®eld assistance in PNG and Indonesia. This research was funded by Na- ing the eclosion and mating of the adult wasps. The wingless tional Science Foundation grant number DEB9801259, the Arnold Arboretum males then chew an exit from the ®g and the winged, pollen- of Harvard University, the American Society for Plant Taxonomists, and the Garden Club of America. bearing females escape in search of receptive ®gs in which to 2 Current address: Department of Zoology, 203 Natural Sciences Building, complete their life cycle. Michigan State University, East Lansing, Michigan 48824 USA. Functional dioecy in Ficus is a unique product of genetic 1342 September 2000] WEIBLENÐDIOECIOUS FIG PHYLOGENY 1343 Miquel classi®ed the functionally dioecious species in four subgenera based on ¯oral characters. Almost a century later, Corner (1965) united functionally dioecious ®gs under subg. Ficus in his reclassi®cation of the genus (Table 1). Ficus can be found in all three tropical regions, but the majority of spe- cies occur in Asia, Malesia, and Australia. Functionally dioe- cious subg. Ficus is restricted to the Paleotropics, and Malesia is the center of diversity in terms of species richness and en- demism. For example, functionally dioecious ®gs comprise an estimated 343 species out of the 503 species in the region Figs. 1±3. The distribution of unisexual ¯orets in ®gs (syconia) of mon- (68%; Berg, 1989). In addition, ®ve of the eight functionally oecious and gynodioecious Ficus. There are two types of ®gs on separate dioecious sections are centered in Indo-Australia (Table 1). plants in gynodioecious Ficus, seed ®gs containing long-styled pistillate ¯o- rets (Fig. 1) and gall ®gs containing short-styled pistillate ¯orets and staminate Species within this region were the focus of the study. ¯orets (Fig. 2). Monoecious species have a single type of ®g containing pis- The primary source of characters for phylogeny reconstruc- tillate ¯orets with styles of varying length and staminate ¯orets (Fig. 3). An- tion was the internal transcribed spacer (ITS) region of nuclear thers are blackened to indicate the position of staminate ¯orets near the ostiole ribosomal DNA. ITS sequences have proven useful for re- in Fig. 2 and dispersed among the pistillate ¯orets in Fig. 3. solving phylogenetic relationships at lower taxonomic levels in plants due to high interspeci®c variability (Baldwin et al., factors controlling ¯oral development and the impact of pol- 1995). As a supplement to ITS sequences, morphological char- linator larvae on seed maturation (Valdeyron and Lloyd, acters for Ficus were analyzed separately and in combination. 1979). The genetics of sex determination in functionally di- Whether or not to combine morphological and molecular data oecious Ficus is known from crossing studies in the edible ®g, sets in a single analysis has been a subject of considerable F. carica L. (Storey, 1975). A pair of linked loci affecting debate in the systematic literature (Bull et al., 1993; de Quei- style lengths and the abortion of staminate ¯orets is respon- roz, Donoghue, and Kim, 1995). Assuming that different data sible for gynodioecious morphology. A stable ratio of progeny sets share the same phylogenetic history, systematists have ar- results from crosses between heterozygous gall ®gs (GgAa) gued that inferences based on all the available data are more and homozygous seed ®gs (ggaa); G is dominant for short- likely to be correct than inferences based on a subset of the styled pistillate ¯orets, while g is recessive for long-styled ¯o- data (Kluge, 1989; Barrett, Donoghue, and Sober, 1991). How- rets, and A is dominant for the development of staminate ¯o- ever, con¯ict between data sets can result from systematic er- rets, while a is recessive
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