Abstract
The common breakdown of one-to-one obligate mutualism renders that the hybridization and introgression are relatively universal in the evolutionary history of Ficus, which makes Ficus a difficult taxon taxonomically. The Ficus sarmentosa complex includes 10 species and 10 varieties, and multiple taxonomical issues exist so far due to overlapping and plastic morphological traits together with frequent gene flow. To explore the evolutionary history and taxonomy of the F. sarmentosa complex, three nuclear loci and comprehensive sampling were implemented. The phylogenetic result supported the species statuses of F. pumila, F. howii, F. dinganensis, F. pubigera, and F. anserina. Whereas, the phylogenetic relationships between the varieties and three allies of F. sarmentosa still remain unclear based on the current data. Besides, F. pubigera var. maliformis was elevated as the species ranks and then was named F. yunnanensis. At last, an omitted species was uncovered in the complex and then described with named F. muricata.
References
Aiton, W. (1789) Hortus Kewensis (Vol. III). George Nicol, London, pp. 451. https://doi.org/10.5962/bhl.title.4504
Bentham, G. (1854) Florula Hongkongensis. Hooker’s journal of botany and Kew Garden miscellany 6: 76.
Berg, C.C. & Corner, E.J.H. (2005) Moraceae (Ficus). In: Nooteboom, H.P. (ed.) Flora Malesiana. National Herbarium of the Netherlands, Leiden, pp. 1–730.
Berg, C.C. (2003a) Flora Malesiana precursor for the treatment of Moraceae 3: Ficus subgenus Ficus. Blumea 48: 529–550. https://doi.org/10.3767/000651903X489537
Berg, C.C. (2003b) Flora Malesiana precursor for the treatment of Moraceae 4: Ficus subgenus Synoecia. Blumea 48: 551–571. https://doi.org/10.3767/000651903X489546
Berg, C.C. (2007) Precursory taxonomic studies on Ficus (Moraceae) for the Flora of Thailand. Thai Forest Bulletin 35: 4–28.
Brandis, D. (1874) The forest flora of North-West and Central India. Wm. H. Allen & CO., London, pp. 424.
Bronstein, J.L. & McKey, D. (1989) The fig/pollinator mutualism: a model system for comparative biology. Experientia 45: 601–604. https://doi.org/10.1007/BF01975676
Chang, S.S. (1982) Three new species of the Moraceae from China. Acta Phytotaxonomica Sinica 20: 95–98.
Chang, S.S. (1983) New taxa of Moraceae from China. Guihaia 3: 295–306.
Chang, S.S. (1984) New Taxa of Moraceae from China and Vietnam. Acta Phytotaxonomica Sinica 22: 64–76.
Chang, S.S., Wu, C.Y. & Cao, Z.Y. (1998) Moraceae (Ficus). In: Chang, S.S. & Wu, C.Y. (eds.) Flora Reipublicae Popularis Sinicae. Science Press, Beijing, pp. 66–169.
Chantarasuwan, B., Berg, C.C., Kjellberg, F., Rønsted, N., Garcia, M., Baider, C. & van Welzen, P.C. (2015) A new classification of Ficus subsection Urostigma (Moraceae) based on four nuclear DNA markers (ITS, ETS, G3pdh, and ncpGS), morphology and leaf anatomy. PloS One 10: e0128289. https://doi.org/10.1371/journal.pone.0128289
Compton, S.G., Grehan, K. & Van Noort, S. (2009) A fig crop pollinated by three or more species of agaonid fig wasps. African Entomology 17: 215–222. https://doi.org/10.4001/003.017.0212
Corner, E.J.H. (1960) Taxonomic notes on Ficus L., Asia and Australasia. The Gardens’ Bulletin Singapore 18: 1–69.
Corner, E.J.H. (1965) Check-list of Ficus in Asia and Australasia with keys to identification. The Gardens’ Bulletin Singapore 21: 1–186.
Cruaud, A., Rønsted, N., Chantarasuwan, B., Chou, L.S., Clement, W.L., Couloux, A., Cousins, B., Genson, G., Harrison, R.D., Hanson, P.E., Hossaert-McKey, M., Jabbourzahab, R., Jousselin, E., Kerdelhue, C., Kjellberg, F., Lopez-Vaamonde, C., Peebles, J., Peng, Y.-Q., Pereira, R.A.S., Schramm, T., Ubaidillah, R., Vvan Noort, S., Weiblen, W.D., Yang, D.R., Yodpinyanee, A., Libeskind-Hadas, R., Cook, J.M., Rasplus, J.Y. & Savolainen, V. (2012) An extreme case of plant–insect codiversification: figs and fig-pollinating wasps. Systematic Biology 61: 1029–1047. https://doi.org/10.1093/sysbio/sys068
Darwell, C.T., Al-Beidh, S. & Cook, J.M. (2014) Molecular species delimitation of a symbiotic fig-pollinating wasp species complex reveals extreme deviation from reciprocal partner specificity. BMC Evolutionary Biology 14: 1–10. https://doi.org/10.1186/s12862-014-0189-9
Doyle, J.J. & Doyle, J.L. (1987) A rapid DNA isolation procedure for small quantities of fresh leaf tissue. Phytochemical Bulletin 19: 11–15.
Franchet, A. & Savatier, L. (1875) Enumeratio plantarum: in Japonia. F. Savy, Parisiis [Paris], pp. 436. https://doi.org/10.5962/bhl.title.75
Hill, D.S. (1967) Figs (Ficus spp.) and fig-wasps (Chalcidoidea). Journal of Natural History 1: 413–434. https://doi.org/10.1080/00222936700770401
Janzen, D.H. (1979) How to be a fig. Annual Review of Ecology Systematics 10: 13–51. https://doi.org/10.1146/annurev.es.10.110179.000305
Jousselin, E., Rasplus, J.Y. & Kjellberg, F. (2003) Convergence and coevolution in a mutualism: evidence from a molecular phylogeny of Ficus. Evolution 57: 1255–1269. https://doi.org/10.1111/j.0014-3820.2003.tb00334.x
Kalyaanamoorthy, S., Minh, B.Q., Wong, T.K., Von Haeseler, A. & Jermiin, L.S. (2017) ModelFinder: fast model selection for accurate phylogenetic estimates. Nature Methods 14: 587–589. https://doi.org/10.1038/nmeth.4285
King, G. (1888) Annals of the Royal botanica garden, Calcutta (Vol. 1). L. Reeve & Co., London, pp. 133–135.
Kizirian, D. & Donnelly, M.A. (2004) The criterion of reciprocal monophyly and classification of nested diversity at the species level. Molecular Phylogenetics Evolution 32: 1072–1076. https://doi.org/10.1016/j.ympev.2004.05.001
Lee, H.H. (2009) Genetic differentiation between Ficus pumila var. pumila and Ficus pumila var. awkeotsang and their pollinators. National Taiwan University, Taibei.
Léveillé, A.A.H. (1915) Flore du Kouy Tcheou. Handwritten materials, Le mans, pp. 431.
Li, G.Y. (2021) Moraceae. In: Hu, X. & Lin, Y.J. (eds.) Flora of Zhejiang. Zhejiang Science and Technology Publisher, Hanzhou, pp. 587–621.
Li, H.Q., Chen, J.Y., Wang, S. & Xiong, S.Z. (2012) Evaluation of six candidate DNA barcoding loci in Ficus (Moraceae) of China. Molecular Ecology Resources 12: 783–790. https://doi.org/10.1111/j.1755-0998.2012.03147.x
Linnaeus, C. (1753) Species Plantarum (Vol. 2). Imprensis Laurentii Salvii, Holmiae [Stockholm], pp. 1059–1060. https://doi.org/10.5962/bhl.title.669
Liu, M. (2013) Divergence and comparative phylogeography of Ficus pumila and its pollinating wasps (Wiebesia spp.). East China Normal University, Shanghai.
Loureiro, J. (1790) Flora Cochinchinensis (Vol. 2). Typis, et expensis academicis, Ulyssipone [Lisboa], pp. 666–667. https://doi.org/10.5962/bhl.title.40199
Lu, J., Gui, P., Lu, Z.L., Zhang, L.F., Tian, H.Z., Gilbert, M.G. & Li, H.Q. (2016) Phylogenetic analysis and taxonomic delimitation of the “hairy-fig” complex of Ficus sect. Eriosycea (Moraceae) in China. Phytotaxa 261: 121–136. https://doi.org/10.11646/phytotaxa.261.2.2
Lu, Z.L., Zhang, Z., Zhou, Q.M., Lu, J., Tian, H.Z. & Li, H.Q. (2017) Molecular analyses of Ficus erecta and its allies within the subsection Frutescentiae (Moraceae). Plant Systematics Evolution 303: 603–614. https://doi.org/10.1007/s00606-017-1393-z
Machado, C.A., Robbins, N., Gilbert, M.T.P. & Herre, E.A. (2005) Critical review of host specificity and its coevolutionary implications in the fig/fig-wasp mutualism. Proceedings of the National Academy of Sciences of the United States of America 102: 6558–6565. https://doi.org/10.1073/pnas.0501840102
Mahima, K., Sudhakar, J.V. & Ramalingam, S. (2020a) Taxonomic delimitation of endemic Ficus amplocarpa and Ficus dalhousiae complexes (Moraceae) by DNA barcoding. Phytotaxa 436: 21–35. https://doi.org/10.11646/phytotaxa.436.1.2
Mahima, K., Sudhakar, J.V. & Sathishkumar, R. (2020b) Molecular phylogeny of the Ficus virens complex (Moraceae). Genome 63: 597–606. https://doi.org/10.1139/gen-2019-0210
Mahima, K., Umapathy, S., Sudhakar, J.V. & Sathishkumar, R. (2021) Systematic reinstatement of highly sacred Ficus krishnae based on differences in morphology and DNA barcoding from Ficus benghalensis (Moraceae). PhytoKeys 186: 121. https://doi.org/10.3897/phytokeys.186.74086
Maximowicz, C.J. (1881) Diagnoses plantarum novarum asiaticarum. IV. Bulletin de l’Acadeìmie impeìriale des sciences de St.-Peìtersbourg 3: 552.
Merrill, E.D. & Chun, W.Y. (1940) Additions to our knowledge of the Hainan flora, III. Sunyatsenia 5: 43–44.
Miquel, F.A.G. (1848) The London Journal of botany (Vol. 7). Reeve, Benham, and Reeve etc, London, pp. 76–77, 436, 442, 453, 469.
Miquel, F.A.G. (1867) Annales musei botanici Lugduno-batavi. C. G. van der Post, Amstelodami, pp. 289,294.
Nguyen, L.T., Schmidt, H.A., Von Haeseler, A. & Minh, B.Q. (2015) IQ-TREE: a fast and effective stochastic algorithm for estimating maximum-likelihood phylogenies. Molecular Biology Evolution 32: 268–274. https://doi.org/10.1093/molbev/msu300
Oliver, D. (1889) Ficus foveolata. In: Hooker, W.J. (ed.) Icones plantarum or figures. Longman, Rees, Orme, Brown, Green, & Longman, etc, London, pp. 1824. https://doi.org/10.5962/bhl.title.16059
Pederneiras, L.C., Gaglioti, A.L., Romaniuc-Neto, S. & Mansano, V.F. (2018) The role of biogeographical barriers and bridges in determining divergent lineages in Ficus (Moraceae). Botanical Journal of the Linnean Society 187: 594–613. https://doi.org/10.1093/botlinnean/boy036
Renoult, J.P., Kjellberg, F., Grout, C., Santoni, S. & Khadari, B. (2009) Cyto-nuclear discordance in the phylogeny of Ficus section Galoglychia and host shifts in plant-pollinator associations. BMC Evolutionary Biology 9: 1–18. https://doi.org/10.1186/1471-2148-9-248
Ronquist, F., Teslenko, M., Van Der Mark, P., Ayres, D.L., Darling, A., Höhna, S., Larget, B., Liu, L., Suchard, M.A. & Huelsenbeck, J.P. (2012) MrBayes 3.2: efficient Bayesian phylogenetic inference and model choice across a large model space. Systematic Biology 61: 539–542. https://doi.org/10.1093/sysbio/sys029
Rønsted, N., Weiblen, G.D., Clement, W., Zerega, N. & Savolainen, V. (2008) Reconstructing the phylogeny of figs (Ficus, Moraceae) to reveal the history of the fig pollination mutualism. Symbiosis 45: 45–55.
Rønsted, N., Weiblen, G.D., Cook, J.M., Salamin, N., Machado, C.A. & Savolainen, V. (2005) 60 million years of co-divergence in the fig–wasp symbiosis. Proceedings of the Royal Society B: Biological Sciences 272: 2593–2599. https://doi.org/10.1098/rspb.2005.3249
Roxburgh, W. (1832) Flora Indica, or, Descriptions of Indian plants. W. Thacker, Serampore, pp. 534. https://doi.org/10.5962/bhl.title.590
Sata, N. (1944) A monographic study of the genus Ficus from the point of view of economic botany. Contributions from the Institute of Horticulture and Economic Botany, Faculty of Agriculture, Taihoku Imperial University 32: 1–405.
Singh, V. & Singh, P. (1991) Some new combinations in the flora of Sikkim. Journal of Economic and Taxonomic botany 3: 705–706.
Su, Z.H., Sasaki, A., Kusumi, J., Chou, P.A., Tzeng, H.Y., Li, H.Q. & Yu, H. (2022) Pollinator sharing, copollination, and speciation by host shifting among six closely related dioecious fig species. Communications biology 5: 1–15. https://doi.org/10.1038/s42003-022-03223-0
Thunberg, C.P. (1786) Ficus (Vol. 9). Elias Gedner, Upsaliae, pp. 15. https://doi.org/10.5962/bhl.title.164532
Tnah, L.H., Lee, S.L., Tan, A.L., Lee, C.T., Ng, K.K.S. & Ng, C.H. (2016) Intraspecific classification of Ficus deltoidea Jack subsp. deltoidea (Moraceae) in Peninsular Malaysia based on morphological and molecular variations. Biochemical Systematics Ecology 67: 119–128. https://doi.org/10.1016/j.bse.2016.06.001
Tsai, L., Hayakawa, H., Fukuda, T. & Yokoyama, J. (2015) A breakdown of obligate mutualism on a small island: An interspecific hybridization between closely related fig species (Ficus pumila and Ficus thunbergii) in Western Japan. American Journal of Plant Sciences 6: 126–131. https://doi.org/10.4236/ajps.2015.61014
Turland, N.J., Wiersema, J.H., Barrie, F.R., Greuter, W., Hawksworth, D.L., Herendeen, P.S., Knapp, S., Kusber, W.-H., Li, D.Z., Marhold, K., May, T.W., McNeill, J., Monro, A.M., Prado, J., Price, M. & Smith, G. (2018) International Code of Nomenclature for algae, fungi, and plants (Shenzhen Code) adopted by the Nineteenth International Botanical Congress Shenzhen, China, July 2017 (Vol. 159). Koeltz Botanical Books, Glashütten, pp. 1–254. https://doi.org/10.12705/Code.2018
Vahl, M. (1806) Enumeratio Plantarum (Vol. 2). Impensis Viduae, Hauniae [Copenhagen], pp. 181–204.
Vaniot, E. & Léveillé, A.A.H. (1907) Memorias de la Real Academia de Ciencias y Artes de Barcelona (Vol. 3). A. López Robert, Impresor, Barcelona, pp. 149.
Wachi, N., Kusumi, J., Tzeng, H.Y. & Su, Z.H. (2016) Genome-wide sequence data suggest the possibility of pollinator sharing by host shift in dioecious figs (Moraceae, Ficus). Molecular Ecology 25: 5732–5746. https://doi.org/10.1111/mec.13876
Wang, G., Zhang, X.T., Herre, E.A., McKey, D., Machado, C.A., Yu, W.B., Cannon, C.H., Arnold, M.L., Pereira, R.A.S. & Ming, R. (2021) Genomic evidence of prevalent hybridization throughout the evolutionary history of the fig-wasp pollination mutualism. Nature Communications 12: 1–14. https://doi.org/10.1038/s41467-021-20957-3
Wiebes, J.T. (1979) Co-evolution of figs and their insect pollinators. Annual Review of Ecology Systematics 10: 1–12. https://doi.org/10.1146/annurev.es.10.110179.000245
Yamazaki, T. (1983) Taxonomic review of the Moraceae from Japan, Korea, Taiwan and adjacent areas (2). The Journal of Phytogeography and Taxonomy 31: 1–15.
Yang, C.H. (2015) Genetic Structure of Ficus sarmentosa var. henryi in eastern China and the gene introgression between Ficus pumila and Ficus sarmentosa var. henryi. East China Normal University, Shanghai, pp. 58.
Yokoyama, J. (2006) Ficus. In: Iwatsuki, K., Boufford, D.E. & Ohba, H. (eds.) Flora of Japan. Kodansha LTD, Tokyo, pp. 67–74.
Yu, H., Liao, Y.L., Cheng, Y.F., Jia, Y.J. & Compton, S.G. (2021) More examples of breakdown the 1:1 partner specificity between figs and fig wasps. Botanical studies 62: 1–12. https://doi.org/10.1186/s40529-021-00323-8
Yu, H., Zhao, N.X., Yao, J. & Chen, Y.Z. (2006) The influence of species-specific coevolution of figs and fig wasps on Ficus (Moraceae) classification. Journal of Tropical Subtropical Botany 14: 439–443. https://doi.org/10.3969/j.issn.1005-3395.2006.5.014
Zhang, L.F., Zhang, Z., Wang, X.M., Gao, H.Y., Tian, H.Z. & Li, H.Q. (2018) Molecular phylogeny of the Ficus auriculata complex (Moraceae). Phytotaxa 362: 39–54. https://doi.org/10.11646/phytotaxa.362.1.3
Zhang, Z., Liao, S., Li, H.Q. & Zhang, D.S. (2020a) Identifications and typifications of Ficus pubigera var. maliformis and related names. Phytotaxa 464: 102–108. https://doi.org/10.11646/phytotaxa.464.1.9
Zhang, Z., Wang, X.M., Liao, S., Tian, H.Z. & Li, H.Q. (2019) Taxonomic treatment of the Ficus auriculata complex (Moraceae) and typification of some related names. Phytotaxa 399: 203–208. https://doi.org/10.11646/phytotaxa.399.3.4
Zhang, Z., Wang, X.M., Liao, S., Zhang, J.H. & Li, H.Q. (2020b) Phylogenetic reconstruction of Ficus subg. Synoecia and its allies (Moraceae), with implications on the origin of the climbing habit. Taxon 69: 927–945. https://doi.org/10.1002/tax.12282