Diapause Programming with Variable Critical Daylength under Changing Photoperiodic Conditions in Mamestra brassicae (Lepidoptera : Noctuidae) :

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著者

    • Kimura Yuji KIMURA Yuji
    • Laboratory of Entomology, Faculty of Agriculture and Life Science, Hirosaki University:(Present address)Aomori Agricultural Experiment Station
    • Masaki Sinzo MASAKI Sinzo
    • Laboratory of Entomology, Faculty of Agriculture and Life Science, Hirosaki University:Correspondence to Sinzo Masaki

抄録

Mamestra brassicae (Linnaeus) can be regarded as a long-day insect, because a long winter diapause (WD) is induced by short daylengths while nondiapause and short summer diapause are predominant under intermediate (14.5 h) and long (>15 h) daylengths, respectively. However, LD16 : 8 (16 h light : 8 h dark) dramatically enhanced WD induction and LD12 : 12 averted WD when followed by LD14 : 10 after the egg or early larval stages. Only three cycles of LD16 : 8 in the first larval stage followed by LD14 : 10 resulted in 100% WD. In the early larval stage, a shift from LD18 : 6 to 15 : 9 as well as from LD15 : 9 to 14 : 10 gave a high incidence of WD, but that from LD16 : 8 to 15 : 9 prevented WD. Increasing shift below the critical daylength (e.g., from LD10 : 14 to 13 : 11) did not avert WD. These results could not be explained either by a response to the direction of daylength change or by a response involving stepwise processes. We hypothesize that, within a certain range of photoperiod, the critical daylength for the programming of pupal development changes with the daylength in the early developmental stages. The incidence and intensity of diapause under simulated 'natural' photoperiodic conditions suggested the significance of daylength change in the fine tuning of the seasonal life cycle.

Mamestra brassicae (Linnaeus) can be regarded as a long-day insect, because a long winter diapause (WD) is induced by short daylengths while nondiapause and short summer diapause are predominant under intermediate (14.5 h) and long (>15 h) daylengths, respectively. However, LD16 : 8 (16 h light : 8 h dark) dramatically enhanced WD induction and LD12 : 12 averted WD when followed by LD14 : 10 after the egg or early larval stages. Only three cycles of LD16 : 8 in the first larval stage followed by LD14 : 10 resulted in 100% WD. In the early larval stage, a shift from LD18 : 6 to 15 : 9 as well as from LD15 : 9 to 14 : 10 gave a high incidence of WD, but that from LD16 : 8 to 15 : 9 prevented WD. Increasing shift below the critical daylength (e.g., from LD10 : 14 to 13 : 11) did not avert WD. These results could not be explained either by a response to the direction of daylength change or by a response involving stepwise processes. We hypothesize that, within a certain range of photoperiod, the critical daylength for the programming of pupal development changes with the daylength in the early developmental stages. The incidence and intensity of diapause under simulated 'natural' photoperiodic conditions suggested the significance of daylength change in the fine tuning of the seasonal life cycle.

収録刊行物

  • Entomological science

    Entomological science 1(4), 467-475, 1998

    Entomological Society of Japan

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各種コード

  • NII論文ID(NAID)
    110003374534
  • NII書誌ID(NCID)
    AA11217633
  • 本文言語コード
    ENG
  • 資料種別
    ART
  • ISSN
    13438786
  • NDL 記事登録ID
    4634328
  • NDL 雑誌分類
    ZR4(科学技術--生物学--動物)
  • NDL 請求記号
    Z54-J320
  • データ提供元
    CJP書誌  CJP引用  NDL  NII-ELS  IR  NDL-Digital 
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