• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to project page

2005 Fiscal Year Final Research Report Summary

Ecological Genetic Study of clock gene which can cause speciation

Research Project

Project/Area Number 14340244
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field 生態
Research InstitutionOkayama University

Principal Investigator

MIYATAKE Takahisa  Okayama University, Grad School Environ, Assoc Prof, 大学院・環境学研究科, 助教授 (80332790)

Co-Investigator(Kenkyū-buntansha) TANIMURA Teiichi  Kyushu University, Grad School Sciences, Assoc Prof, 大学院・理学研究院, 助教授 (20142010)
MATSUMOTO Akira  Kyushu University, Res Dev Canter for Higher Education, Assistant, 高等教育センター, 助手 (40229539)
Project Period (FY) 2002 – 2005
Keywordsspeciation / reproductive isolation / clock gene / period gene / melon fly / doubletime / allochronic / insect
Research Abstract

The mechanism by which a clock gene pleiotropically controlling life history and behavioral traits causes reproductive isolation is explained using a model species, the melon fly, Bactrocera cucurbitae (Coquillett) (Diptera : Tephritidae). Melon flies mate once a day, at dusk. The population selected for life history traits exhibits correlated responses in the time of mating during the day. For example, the fly populations selected for faster (slower) development have an earlier (later) time of mating. A circathan rhythm controls the time of mating. The circadian periods in constant darkness were about 22h in lines selected for a short developmental period and about 31 h in lines selected for a long developmental period. The data on crosses between the selected lines indicated that the developmental period is controlled by a polygene, whereas the circadian period may be controlled by a single clock gene. These results suggest a clock gene pleiotropically controls developmental and circ … More adian periods in the melon fly. Reproductive isolation may often evolve as an indirect (pleiotropic) consequence of adaptation to different environments or habitats. For example, niches that are temporally or seasonally offset can select organisms with different developmental characteristics. These development differences can inadvertently cause reproductive isolation by a variety of means including shifts in mating activity patterns. The difference in time of mating between populations selected for developmental period translated into significant prezygotic isolation, as measured by mate choice tests. If the mating time between populations differed more than 1 h, the isolation index was significantly higher than zero. These findings indicate that premating isolation can be established by a pleiotropic effect of a clock gene. There are many examples in which the difference in timing of reproduction prevents gene flow between populations, such as the egg spawning time in marine organisms, the flowering time in angiosperms, and the time of mating in insects. In, such, organisms ; if genetic correlations between circadian rhythm and reproductive traits exist, multifarious divergent selection for life history traits would often accelerate the evolution of reproductive isolation through clock genes. Natural populations may diverge in reproduction time through drift, direct natural selection for time of reproduction, or as a by-product effect of genetic correlations. In any case, clock genes are keys in reproductive isolation. We also analyzed sequence of amino-acid of period and doubletime genes, so called as clock genes, in short and long developmental period lines. The difference in a point amino-acid difference in doubletime was detected between short and long lines, and this difference might be related to the difference in mating time of Bactrocera cucurbitae. To examine this, we need to identify Drosophila melanogaster transjenic system, a null mutant of doubletime. Less

  • Research Products

    (10 results)

All 2006 2004 2002

All Journal Article (10 results)

  • [Journal Article] アロクロニックな生殖隔離と生物の測時機構2006

    • Author(s)
      宮竹貴久
    • Journal Title

      日本生態学会誌 56(印刷中)

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Allochronic reproductive isolation and biological rhythm2006

    • Author(s)
      Miyatake T
    • Journal Title

      Japanese Journal of Ecological Society 56(in press)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Eradication of the melon fly Bactrocera cucurbitae in Japan : Importance of behavior, ecology, genetics, and evolution.2004

    • Author(s)
      Koyama J, Kakinohana H, Miyatake T
    • Journal Title

      Annual Review of Entomology 49

      Pages: 331-349

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Male courtship song in circadian rhythm mutants of Bactrocera cucurbitae (Tephritidae : Diptera).2004

    • Author(s)
      Miyatake T, Kanmiya K
    • Journal Title

      Journal of Insect Physiology 50

      Pages: 85-91

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Eradication of the melon fly Bactrocera cucurbitae in Japan : Importance of behavior, ecology, genetics, and evolution.2004

    • Author(s)
      Koyama J, Kakinohara H, Miyatake T
    • Journal Title

      Annual Review of Entomology 49

      Pages: 331-349

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Circadian rhythm and time of mating in Bactrocera cucurbitae (Diptera : Tephritidae) selected for age at reproduction.2002

    • Author(s)
      Miyatake T
    • Journal Title

      Heredity 88

      Pages: 302-306

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Pleiotropic effect, clock genes, and reproductive isolation.2002

    • Author(s)
      Miyatake T
    • Journal Title

      Population Ecology 44

      Pages: 201-207

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] The period gene and allochronic reproductive isolation in Bactrocera cucurbitae.2002

    • Author(s)
      Miyatake T, Matsumoto A, Matsuyama T, Ueda HR, Toyosato T, Tanimura T
    • Journal Title

      Proceedings of the Royal Society of London Series B 269

      Pages: 2467-2472

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Circadian rhythm and time of mating in Bactrocera cucurbitae (Diptera : Tephritidae) selected for age at reproduction2002

    • Author(s)
      Miyatake T
    • Journal Title

      Heredity 88

      Pages: 302-306

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] The period gene and allochronic reproductive isolation in Bactrocera cucurbitae.2002

    • Author(s)
      Miyatake T, Matsumoto A, Matsuyama T, Ueda HR, Toyosato T, Tanimura T
    • Journal Title

      Proceedings of the Royal Society of London Series B.269

      Pages: 2467-2472

    • Description
      「研究成果報告書概要(欧文)」より

URL: 

Published: 2007-12-13  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi