Published Papers - NAIKI Akiyo

Comparison of mechanisms of reproductive interference in Taraxacum.

Takemori A, Naiki A, Takakura KI, Kanaoka MM, Nishida S

Annals of botany ( Annals of Botany )  123 ( 6 ) 1017 - 1027   2019.06 [ Peer Review Accepted ]

Type of publication: Research paper (scientific journal)

　View Summary

BACKGROUND AND AIMS: Reproductive interference may reduce fitness of either of the involved species, with potentially important ecological and evolutionary consequences. Except for the effect of shared pollinators on reproductive success, however, mechanisms underlying reproductive interference have been little studied, even though the severity of its impact may depend on the specific mechanism. The aim of this study was therefore to explore the mechanisms of reproductive interference between Taraxacum japonicum (native to Japan) and Taraxacum officinale (alien). METHODS: In a field survey, the association between alien species density and seed set in T. japonicum, and whether pollinator behaviour indicated a preference for the alien, were examined. Effects of heterospecific pollen deposition were measured in a series of hand pollination experiments, including mixed pollination experiments in which the order of application of conspecific and heterospecific pollen was varied. Finally, to investigate hybridization frequency, the parentage of seedlings produced following natural, mixed or heterospecific pollination was compared. KEY RESULTS: Alien species density did not negatively affect native seed set, nor did pollinators appear to have a preference for alien flowers. The hand pollination experiments showed that heterospecific pollen deposition adversely affected native seed set, especially when alien pollen was applied before conspecific pollen. No viable hybrids were found following natural pollination, which suggests that hybridization might be a rare event. CONCLUSION: Among the examined mechanisms, heterospecific pollen deposition might have the largest deleterious effect on the native species. This effect is frequency dependent; thus, a positive feedback loop may cause the effect on the population dynamics to increase over time, with the result that the alien might eventually displace the native in a population. Effects of the examined mechanisms on population dynamics should be investigated further to improve understanding of the impact of reproductive interference on the structure of plant communities.

• Access this article

  DOI
• Search related information
  PubMed

Calophyllum honbaense (Clusiaceae), A new species from Hon Ba Nature Reserve, Southern Vietnam

Dang Van-Son, Toyama Hironori, Tagane Shuichiro, Hoang Nghia-Son, Naiki Akiyo

TAIWANIA   64 ( 1 ) 86 - 89   2019.03 [ Peer Review Accepted ]

Type of publication: Research paper (scientific journal)

• Access this article

  DOI

Lasianthus bidoupensis (Rubiaceae), a New Species from Southern Vietnam

Dang V.S., Tagane S., Hoang N.-S., Toyama H., Naiki A.

Annales Botanici Fennici ( FINNISH ZOOLOGICAL BOTANICAL PUBLISHING BOARD )  56 ( 1-3 ) 191 - 195   2019.02 [ Peer Review Accepted ]

Type of publication: Research paper (scientific journal)

　View Summary

A new species, Lasianthus bidoupensis V.S. Dang & Naiki (Rubiaceae) is described and illustrated from Bidoup Nui Ba National Park, Lam Dong Province, southern Vietnam. It resembles L. yaharae which was recently discovered from Mt. Hon Ba and L. dalatensis which is endemic to Dalat, southern Vietnam. However, L. bidoupensis differs from them by having larger leaves and bracts, longer petioles, stipules, calyx and corolla tubes, and deep-red mature fruits.

• Access this article

  DOI

Two new species of Lasianthus (Rubiaceae) from Hoang Lien National Park, northern Vietnam

Dang V., Naiki A.

Phytotaxa ( MAGNOLIA PRESS )  423 ( 1 ) 33 - 40   2019 [ Peer Review Accepted ]

Type of publication: Research paper (scientific journal)

　View Summary

Two new species, Lasianthus fansipanensis V.S. Dang & Naiki and Lasianthus sapaensis V.S. Dang & Naiki (sect. Nudiflorae), were discovered in the Hoang Lien National Park of northern Vietnam and are here described and illustrated. Colour photographs, preliminary conservation assessment, and tables comparing these two new species against two closely related species are also presented.

• Access this article

  DOI

Two New Species of Neolitsea (Lauraceae), N. kraduengensis from Thailand and N. vuquangensis from Vietnam and an Analysis of their Phylogenetic Positions using ITS sequences

Mitsuyuki Chika, Tagane Shuichiro, Nguyen Van Ngoc, Hoang Thi Binh, Suddee Somran, Rueangruea Sukid, Toyama Hironori, Mase Keiko, Yang Chen-Jue, Naiki Akiyo, Yahara Tetsukazu

Acta Phytotaxonomica et Geobotanica ( 日本植物分類学会 )  69 ( 3 ) 161 - 173   2018.10 [ Peer Review Accepted ]

Type of publication: Research paper (scientific journal)

　View Summary

Two novel species of Neolitsea (Lauraceae), Neolitsea kraduengensis Tagane & Yahara and N. vuquangensis Mitsuyuki & Yahara, are described and illustrated. Neolitsea kraduengensis occurs in Phu Kradueng National Park, Loei Province, Northeast Thailand. Neolitsea vuquangensis is in Vu Quang National Park, Ha Tinh Province, North Central Vietnam. Morphological differences of the two species from similar species are presented. A phylogenetic tree reconstructed from ITS sequences supports their distinctiveness. Two phenotypically similar species, Neolitsea aurata and N. vuquangensis , with dense golden yellow hairs on the leaf blades, are not sister to each other.

• Access this article

  DOI
• Search related information
  CiNii Research

Contributions to the Flora of Myanmar II: New records of eight woody species from Tanintharyi Region, Southern Myanmar

Tagane S.

Natural History Bulletin of the Siam Society ( Natural History Bulletin of the Siam Society )  63 ( 1 ) 47 - 56   2018.10 [ Peer Review Accepted ]

Type of publication: Research paper (scientific journal)

Erythroxylum calyptratum (Erythroxylaceae), a new species from Mt. Fansipan, northern Vietnam

Komada N., Tagane S., Ngoc T. N., Binh H. T., Son H. T., Toyama H., Nagamasu H., Naiki A.

Phytotaxa ( Magnolia Press )  347 ( 4 ) 279 - 284   2018.04 [ Peer Review Accepted ]

Type of publication: Research paper (scientific journal)

　View Summary

Erythroxylum calyptratum, sp. nov. (Erythroxylaceae), from Mt. Fansipan, Hoang Lien National Park, Lao Cai Province, northern Vietnam, is newly described. The new species is characterized by thinly chartaceous leaves with 2–3 mm long petiole, 1–3 flowered inflorescences, downward facing white flowers, well-developed petal appendages (1/3–1/2 length of petals) and entirely free 3 styles. A description, illustrations, DNA barcodes of rbcL and matK and a key to the species of Erythroxylum in Indochina are provided.

• Access this article

  DOI

A new record Lasianthus cambodianus Pit. (Rubiaceae) for the flora of Vietnam

Dang VS, Tagane S, Toyama H, Ngoc NV, Son HN, Naiki A

Journal of biotechnology   15 ( 3A ) 263 - 267   2018.04 [ Peer Review Accepted ]

Type of publication: Research paper (scientific journal)

Lecanorchis sarawakensis (Orchidaceae, vanilloideae), a new mycoheterotrophic species from sarawak, Borneo

Suetsugu K., Yiing L. C., Naiki A., Tagane S., Takeuchi Y., Toyama H., Yahara T.

Phytotaxa ( MAGNOLIA PRESS )  338 ( 1 ) 135 - 139   2018.02 [ Peer Review Accepted ]

Type of publication: Research paper (scientific journal)

• Access this article

  DOI

Contributions to the Flora of Myanmar: I: Nine taxa of monocots newly recorded from Myanmar

TANAKA Nobuyuki, TAGANE Shuichiro, NAIKI Akiyo, AUNG Mu Mu, TANAKA Noriyuki, DEY Santanu, MOOD John, MURATA Jin

Bulletin of the National Museum of Nature and Science. Series B. Botany   44 ( 1 ) 31‐39   2018.02 [ Peer Review Accepted ]

Type of publication: Research paper (scientific journal)

• Search related information
  J-GLOBAL

Gentiana laotica, a new species of Gentianaceae from Laos

Souladeth P., Tagane S., Naiki A., Nagamasu H., Yahara T.

Thai Forest Bulletin (Botany)   46 ( 1 ) 72 - 75   2018.01 [ Peer Review Accepted ]

Type of publication: Research paper (scientific journal)

　View Summary

© 2018 The Forest Herbarium A new species of Gentiana (Gentianaceae), G. laotica Soulad., Tagane & Yahara, from Phou Khao Khouay National Protected Area, Vientiane Province, central Laos, is described. Photographs, vernacular name, DNA barcodes of rbcL, matK and ITS, and preliminary conservation status are provided for the new species.

• Access this article

  DOI

Five new species of syzygium (Myrtaceae) from Indochina and Thailand

Tagane S., Dang V. S., Souladeth P., Nagamasu H.,Toyama H., Naiki A., Fuse K., Tran H., Yang C.-J., Prajaksood A., Yahara T.

Phytotaxa   375 ( 4 ) 247 - 260   2018 [ Peer Review Accepted ]

Type of publication: Research paper (scientific journal)

• Access this article

  DOI

Mussaenda recurvata (Rubiaceae), a new species from southern vietnam with observations on its heterostyly

Naiki A., Tagane S., Toyama H., Dang V. S., Yahara T.

Phytotaxa ( MAGNOLIA PRESS )  328 ( 2 ) 167 - 174   2017.11 [ Peer Review Accepted ]

Type of publication: Research paper (scientific journal)

　View Summary

Herein, Mussaenda recurvata, a new species from Hon Ba Nature Reserve, southern Vietnam, is described and illustrated. This species is morphologically similar to M. longipetala, distributed from southern China to northern Vietnam, in having recurved stipules and densely pilose and puberulent hairs throughout, but differs in its strongly recurved calyx lobes, a shorter corolla tube, and ovate corolla lobes. The species is morphologically heterostylous and it appears to be functionally dioecious. An updated key to Mussaenda species in Vietnam, Laos, and Cambodia is also provided.

• Access this article

  DOI

Heteropanax thaiensis, a new species and Schefflera wrayi (Araliaceae), a new record to Thailand

Tagane S.

Thai Forest Bulletin (Botany) ( Thai Forest Bulletin (Botany) )  45 ( 2 ) 99 - 104   2017 [ Peer Review Accepted ]

Type of publication: Research paper (scientific journal)

• Access this article

  DOI

<i>Macrosolen bidoupensis</i> (Loranthaceae), a new species from Bidoup Nui Ba National Park, southern Vietnam.

Tagane S, Dang VS, Ngoc NV, Binh HT, Komada N, Wai JS, Naiki A, Nagamasu H, Toyama H, Yahara T

PhytoKeys ( PhytoKeys )  ( 80 ) 113 - 120   2017 [ Peer Review Accepted ]

Type of publication: Research paper (scientific journal)

　View Summary

Macrosolen bidoupensis Tagane &amp V.S.Dang, sp. nov. (Loranthaceae) is newly described from Bidoup Nui Ba National Park in Lam Dong Province, southern Vietnam. The new species is characterized by small broadly elliptic to circular leaves, sessile to short petioles, slightly cordate to rounded leaf bases, 4-5 pairs of lateral veins and a basally green corolla tube. An illustration, a summary of DNA barcoding of the plastid genes rbcL and matK, and a key to the species of Macrosolen in Vietnam are provided.

• Access this article

  DOI
• Search related information
  PubMed

Garcinia hopii (Clusiaceae), a new species from Bidoup Nui Ba National Park, southern Vietnam.

Hironori Toyama, Van-Son Dang, Shuichiro Tagane, Ngoc Van Nguyen, Akiyo Naiki, Hidetoshi Nagamasu, Tetsukazu Yahara

PhytoKeys ( PENSOFT PUBL )  77   63 - 70   2017 [ Peer Review Accepted ]

Type of publication: Research paper (scientific journal)

　View Summary

A new species, Garcinia hopii H. Toyama & V. S. Dang is described from Bidoup Nui Ba National Park, southern Vietnam. This species is similar to Garcinia hendersoniana Whitmore but differs from that species in having larger leaves, clustered pistillate flowers, a greater number of sterile anthers and a larger stigma of young fruits. A description, preliminary conservation assessment, illustration, photographs and DNA barcodes of the new species are provided, as well as an updated key to Garcinia sect. Hebradendron in Indochina.

• Access this article

  DOI
• Search related information
  PubMed

Morphological and Molecular Phylogenetic Analyses of <i>Geranium yesoense </i>(Geraniaceae) in Japan

Wakasugi Yuki, Azuma (Present Name: Suzuki) Hiroshi, Naiki Akiyo, Nishida Sachiko

Acta Phytotaxonomica et Geobotanica ( 日本植物分類学会 )  68 ( 3 ) 129 - 144   2017 [ Peer Review Accepted ]

Type of publication: Research paper (scientific journal)

　View Summary

<i>Geranium yesoense </i>(Geraniaceae) includes several varieties that are mainly discriminated by two morphological features, namely, the degree of leaf incision and the density of spreading hairs on the sepals, but these features have never been objectively quantified. To clarify whether these features can truly discriminate varieties, we analyzed leaf shape and sepal pubescence, and conducted a molecular phylogenetic analysis using nuclear and chloroplast DNA. Our morphological analyses showed some trends in leaf morphology and density of hairs, but failed to identify any groupings that could be clearly distinguished on the basis of these features. Our molecular analysis recognized <i>G. yesoense </i>as a distinct taxon, but did not support the existence of subgroups within the species. We conclude that <i>G. yesoense </i>must be treated as a single taxon with some tendency toward morphological variation depending on locality and habitat.

• Access this article

  DOI
• Search related information
  CiNii Research

Two New Taxa and One New Report of Tarenna (Rubiaceae) for the Flora of Cambodia and Vietnam

Naiki Akiyo, Tagane Shuichiro, Chhang Phourin, Van-Son Dang, Toyama Hironori, Nagamasu Hidetoshi, Yahara Tetsukazu

ACTA PHYTOTAXONOMICA ET GEOBOTANICA   68 ( 2 ) 93 - 100   2017 [ Peer Review Accepted ]

Type of publication: Research paper (scientific journal)

• Access this article

  DOI

New Distributional Records of the Mycoheterotrophic Sciaphila alba (Triuridaceae), outside the Type Locality (vol 68, pg 123, 2017)

Kenji Suetsugu, Akiyo Naiki, Yayoi Takeuchi, Hironori Toyama, Shuichiro Tagane, Tetsukazu Yahara

ACTA PHYTOTAXONOMICA ET GEOBOTANICA ( JAPANESE SOC PLANT SYSTEMATICS, UNIV TOKYO, GRADUATE SCH )  68 ( 3 ) 204 - 204   2017 [ Peer Review Accepted ]

Type of publication: Research paper (scientific journal)

• Access this article

  DOI

Two New Taxa and One New Report of <i>Tarenna </i>(Rubiaceae) for the Flora of Cambodia and Vietnam

Naiki Akiyo, Tagane Shuichiro, Chhang Phourin, Dang Van-Son, Toyama Hironori, Nagamasu Hidetoshi, Yahara Tetsukazu

Acta Phytotaxonomica et Geobotanica ( 日本植物分類学会 )  68 ( 2 ) 93 - 100   2017 [ Peer Review Accepted ]

Type of publication: Research paper (scientific journal)

　View Summary

A new species, <i>Tarenna aurantiaca </i>Naiki & Tagane (Rubiaceae) from Hon Ba Nature Reserve, southern Vietnam, and a new variety <i>T. pilosa </i>var. <i>parvifolia </i>Naiki & Tagane from Bokor Nature Reserve, southern Cambodia, are described and illustrated. <i>Tarenna costata </i>(Miq.) Merr. is reported for the first time for the flora of Cambodia. A key to the species of <i>Tarenna </i>in Indochina, including Cambodia, Laos and Vietnam, is provided.

• Access this article

  DOI