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Genetic Structures of Calophyllum Inophyllum L., a Tree Employing Sea

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Genetic Structures of Calophyllum Inophyllum L., a Tree Employing Sea Genetic structures of Calophyllum inophyllum L., a tree employing sea-drift seed dispersal in the northern extreme of its distribution So Hanaoka, Ching-Te Chien, Shun-Ying Chen, Atsushi Watanabe, Suzuki Setsuko, Kazutaka Kato To cite this version: So Hanaoka, Ching-Te Chien, Shun-Ying Chen, Atsushi Watanabe, Suzuki Setsuko, et al.. Genetic structures of Calophyllum inophyllum L., a tree employing sea-drift seed dispersal in the northern extreme of its distribution. Annals of Forest Science, Springer Nature (since 2011)/EDP Science (until 2010), 2014, 71 (5), pp.575 - 584. 10.1007/s13595-014-0365-5. hal-01102592 HAL Id: hal-01102592 https://hal.archives-ouvertes.fr/hal-01102592 Submitted on 13 Jan 2015 HAL is a multi-disciplinary open access L’archive ouverte pluridisciplinaire HAL, est archive for the deposit and dissemination of sci- destinée au dépôt et à la diffusion de documents entific research documents, whether they are pub- scientifiques de niveau recherche, publiés ou non, lished or not. The documents may come from émanant des établissements d’enseignement et de teaching and research institutions in France or recherche français ou étrangers, des laboratoires abroad, or from public or private research centers. publics ou privés. Annals of Forest Science (2014) 71:575–584 DOI 10.1007/s13595-014-0365-5 ORIGINAL PAPER Genetic structures of Calophyllum inophyllum L., a tree employing sea-drift seed dispersal in the northern extreme of its distribution So Hanaoka & Ching-Te Chien & Shun-Ying Chen & Atsushi Watanabe & Suzuki Setsuko & Kazutaka Kato Received: 9 July 2013 /Accepted: 27 February 2014 /Published online: 27 March 2014 # INRA and Springer-Verlag France 2014 Abstract SSR markers. Genetic differentiation (FST and AMOVA), • Context Little is known about the potential of gene flow and genetic structure (STRUCTRE analysis), and historical gene resulting genetic structures of trees employing sea-drifting flow (assignment testing) were determined. seed dispersal in island populations. • Results Frequent gene flow within and rare gene flow • Aims Current genetic structure and the magnitude of histor- among island groups was determined using assignment ical gene flow were estimated in island populations of testing. Clear genetic structures were also detected using Calophyllum inophyllum L., a typical plant employing sea- the STRUCTURE analysis, which demonstrated differentia- drifting seed dispersal. tion between dominant clusters among geographically con- • Methods Samples were collected from the northern extreme structed island groups. of the species’ distribution (Taiwan and the Sakishima, Daito, • Conclusions The potential for gene flow via sea-drifting seed and Ogasawara Islands, Japan) and genotyped using 15 EST- dispersal was high, and this was possible even among small islands. However, the extent and frequency of gene flow were Handling Editor: Bruno Fady not great enough to prevent genetic differentiation in a range of over a few hundred kilometers. Contribution of the co-authors Ching-Te Chien: Assistance of data analysis and writing paper. Shun-Ying Chen: Designing and conducting ecological research and Keywords Calophyllum inophyllum . EST-SSR . Sea-drift sampling. seed dispersal . Gene flow . Phylogeography . Population Atsushi Watanabe: Designing the experiments and supervising the writ- genetics . Genetic structure . Island ecology ing paper. Suzuki Setsuko: Designing and conducting sampling, and support ex- periments. Kazutaka Kato: Coordinating the research project. 1 Introduction Electronic supplementary material The online version of this article (doi:10.1007/s13595-014-0365-5) contains supplementary material, Isolation of populations associated with limited gene flow has which is available to authorized users. important implications when determining genetic differentia- : S. Hanaoka (*) K. Kato tion and structure, and the effect is generally remarkable in Forest Tree Breeding Center, Forestry and Forest Products Research island plant populations. Sea currents are one mode of seed Institute, 3809-1 Ishi, Hitachi City, Ibaraki 319-1301, Japan dispersal that allows island littoral flora to overcome spatial e-mail: [email protected] obstacles to gene flow (Vatanparast et al. 2011), and plants : C.<T. Chien S.<Y. Chen that are capable of utilizing sea currents as vectors for seed Taiwan Forestry Research Institute, No. 53, Nan-hai road, dispersal possess the capacity to transport their seeds over Taipei 10066, Taiwan long distances. Therefore, clear genetic differentiation might A. Watanabe not be found in such species even in island populations. In Faculty of Agriculture, Kyushu University, fact, previous studies showed that plants that employ sea- 6-10-1 Hakozaki, Fukuoka, Higashi-ku 812-8581, Japan drifting seed dispersal exhibited low levels of genetic differ- entiation throughout certain oceanic regions (Takayama et al. S. Setsuko Forestry and Forest Products Research Institute, 1, Matsunosato, 2006, 2008). While similar results may be expected when Tsukuba City, Ibaraki 305-8687, Japan examining populations on small islands within a relatively 576 S. Hanaoka et al. narrow range, previous studies demonstrated that genetic dif- The past existence of land bridges may also have ferentiation is not necessarily low in plant species that employ affected the current genetic structures of C. inophyllum. sea current-based seed dispersal, even at the island chain level While land bridges linking China and Okinawa Island (e.g., Aster miyagii;Maki2001). The counterintuitive nature formed several times prior to the last glacial maximum of the results of such studies has not been adequately exam- (LGM; ca. 25,000–15,000 years BP), the majority of ined, and further research is required to develop a fuller the islands in this region have been independent for the understanding of gene flow among small islands as well as past 20,000 years (Kimura 1996). During the LGM, the genetic variations and the structure of plants that employ sea- distribution of C. inophyllum in Japan was thought to drifting seed dispersal. have been hampered by the fact that air temperatures Calophyllum inophyllum. L. is a large, broadleaf, insect- within the Sakashima Islands were 5–10 °C colder than pollinated evergreen tree species distributed within coastal they are now (Zheng et al. 2003). The rising air tem- regions ranging from tropical eastern Africa (Kenya, Tanza- perature during the postglacial period (ca. 12,000 years nia, Madagascar etc.) to Southeast Asia (India, Sri Lanka, BP) allowed the migration of C. inophyllum from Indonesia, Malaysia, Philippines etc.) and Polynesia (Palau, Southeast Asia and/or southern Pacific islands to the Samoa, Fiji, the Cook islands etc.; Lemmens 1994;Whistler Sakishima, Daito, and Ogasawara Islands. In any case, 2009). The species is used for windbreak forests in Japan, and plants distributed throughout the majority of the islands its seeds are used in the production of cosmetics, biodiesel between Taiwan and the Ogasawara Islands have been fuel, and medicine in other tropical countries. This multitude isolated from one another for more than 20,000 years, of practical uses has led to the species’ conservation and with the existence of continuous populations having management having been identified as an important topic of been impossible for at least that much time. Therefore, study. C. inophyllum was found to be well suited to seawater- it was expected that evaluation of these areas would based seed dispersal, as its seeds are capable of floating in allow determination of historical gene flows and genetic seawater for longer than 90 days without experiencing a structures of C. inophyllum that resulted from sea-drifting significant decrease in germination rate (Nakanishi 1988). seed dispersal. Therefore, it was concluded that C. inophyllum possessed a The present study examined (1) the genetic diversity, (2) high capacity for increasing its distributional range through the degree of historical gene flow, and (3) the genetic struc- sea current-based seed dispersal, a feature that may have tures of island populations of C. inophyllum in the northern contributed to the wide distribution currently associated with extreme of its distribution to provide a better understanding of the species. Despite its wide range, the distribution of the potential for gene flow in plants with sea-drifting seeds C. inophyllum is limited by its inability to tolerate low tem- and aid in the conservation management of their genetic peratures, with areas in which the mean minimum temperature resources. of the coldest month was <12 °C having proven inhospitable for growth of the species (Friday and Okano 2006). Taira (1987) also suggested that planting C. inophyllum proved 2Materialsandmethods difficult in the northern part of Okinawa Island, an area located approximately 250 km to the northeast of the 2.1 Sampling sites Sakishima Islands where the mean daily minimum air tem- perature during the coldest months in 1981–2010 was 12.4 °C Samples were collected from Taiwan and the Sakishima, [28.833 N, 128.268 E] (Japan Meteorological Agency, http:// Daito, and Ogasawara Islands (Fig. 1). The Sakishima Islands www.jma.go.jp/jma/indexe.html). In addition, observations were subdivided into the Yaeyama Islands and Miyako by the authors of the present study showed that current-year Islands, which were classified for the purposes of this study seedlings died within 14 days of exposure to cool temperature into the Yaeyama and Miyako
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