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Studies on factors biasing the primary sex ratio toward females in the oriental tea tortrix, Homona magnanima (Lepidoptera : Trotricidae)

Research Project

Project/Area Number 12660052
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 蚕糸・昆虫利用学
Research InstitutionTokyo University of Agriculture and Technology

Principal Investigator

KUNIMI Yasuhisa  Department of Applied Biological Science, Faculty of Agriculture, Tokyo University of Agriculture and Technology, Professor, 農学部, 教授 (50195476)

Co-Investigator(Kenkyū-buntansha) MAKAI Madoka  Department of Applied Biological Science, Faculty of Agriculture, Tokyo University of Agriculture and Technology, Professor, 農学部, 助手 (60302907)
Project Period (FY) 2000 – 2001
Project Status Completed (Fiscal Year 2001)
Budget Amount *help
¥3,500,000 (Direct Cost: ¥3,500,000)
Fiscal Year 2001: ¥1,800,000 (Direct Cost: ¥1,800,000)
Fiscal Year 2000: ¥1,700,000 (Direct Cost: ¥1,700,000)
KeywordsHomona magnanima / Male-killing / Wolbachia / Sex-ratio distorters / Tumor / Virus-like particles / Horizontal transmission / Vertical transmission
Research Abstract

A female-biased sex ratio was found in the oriental tea tortrix, Homona magnanima (Lepidoptera : Tortricidae), in Tsukuba, Ibaraki, Japan. There was no difference in mean egg hatch between the all-female and normal strains. Greater than 50% mortality was observed in the all-female strain larvae, suggesting that female-only broods are produced as a result of late male-killing. The female-biased sex ratio was maternally inherited and maintained, even when females were backcrossed with males of the normal strain, thus implicating cytoplasmic parasitism as its cause. The phenomenon was persistent in the presence of antibiotics, and was not due to infection by agents that cause other male-killing phenomena, such as Rickettsia, Wolbachia, Spiroplasma, or protozoan parasites. When a homogenate of dead male larvae of the all-female strain was inoculated in normal strain larvae, this male-killing trait was transmitted to the next generation ; thus, its causative agent is likely transmitted horizontally as well.

Report

(3 results)
  • 2001 Annual Research Report   Final Research Report Summary
  • 2000 Annual Research Report
  • Research Products

    (4 results)

All Other

All Publications (4 results)

  • [Publications] Morimoto, S.: "Late male-killing phenomenon found in a Japanese population of the oriental tea tortrix, Homona Magnanime (Lepicoptera : Tortricidae)"Heredity. 87. 435-440 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Morimoto, S., M. Nakai, A. Ono, Y. Kunimi: "Male-killing phenomenon found in a Japanese population of the oriental tea tortrix, Homona magnanima (Lepidoptera : Tortricidae)"Heredity. 87. 435-440 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Morimoto, S.: "Late male-killing phenomenon found in a Japanese population of the oriental tea tortrix, Homona magnanima (Lepidoptera: Tortricidae)"Heredity. 87. 435-440 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] 国見裕久,仲井まどか: "微生物の資材化:研究の最前線"ソフトサイエンス社. 364 (2000)

    • Related Report
      2000 Annual Research Report

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Published: 2000-04-01   Modified: 2016-04-21  

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