Stage-Dependent Changes of the Prothoracicotropic Hormone (PTTH) Activity of Brain Extracts and of the PTTH Sensitivity of the Prothoracic Glands in the Cabbage Armyworm, Mamestra brassicae, before and during Winter and Aestival Pupal Diapause
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概要
- 論文の詳細を見る
The cabbage armyworm, Mamestra brassicae, enters winter and aestival diapause in the pupal stage under 10L-14D and 16L-8D, respectively, at 23℃. It develops without pupal dormancy under 14L-10D at 23℃. In 6th-instar larvae, the hemolymph ecdysteroid titers as well as the activity and sensitivity of the prothoracic glands (PGs) were nearly the same in the diapause-and condiapause-programmed larvae. In non-diapause pupae (ND-pupae), the ecdysteroid titer peaked in the first half of the pupal stage. By contrast, in winter and aestival diapause pupae (WD-and Ad-pupae), the ecdysteroid tiler remained low after pupation. The ecdysteroid titer in diapausing AD-pupae was 8- to 10-times higher than that in diapausing WD-pupae. PGs from 5th-instar and 6th-instar larvae, as well as those from pupae, secreted ecdysteroids and showed a far stronger response to big prothoracicotropic hormone (PTTH) than to small PTTH in vitro. PG activity and its sensitivity to bit PTTH fluctuated in a stage-dependent manner, and the pattern was nearly the same for 6th-instar larvae committed to develop into ND-, WD-or AD-pupae. When ecdysteroids for larval-pupal metamorphosis appears in the hemolymph mof 6th-instar larvae, the activity and sensitivity of the PGs may be suppressed quickly. After pupation, the titer of hemolymph ecdysteroids as well as the activity and sensitivity of the PGs may be related to the strength (or duration) of pupal dormancy which differs between WD-pupae and AD-pupae.
- 社団法人日本動物学会の論文
著者
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Watanabe M
Department Of Physics Biology And Informatics Faculty Of Science Yamaguchi University
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Endo K
Department Of Physics Biology And Informatics Faculty Of Science Yamaguchi University
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Yamanaka A
Laboratory Of Environmental Biology Graduate School Of Science And Engineering Yamaguchi University:
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Yamanaka Akira
Yamaguchi Univ. Yamaguchi Jpn
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Kondo M
Univ. Tokyo Chiba Jpn
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Endo Katsuhiko
Biological Institute, Faculty of Science, Yamaguchi University
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Fujimoto Yasuhiro
Biological Institute, Faculty of Science, Yamaguchi University
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Kondo Masakazu
Biological Institute, Faculty of Science, Yamaguchi University
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Yamanaka Akira
Biological Institute, Faculty of Science, Yamaguchi University
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Watanabe Masao
Biological Institute, Faculty of Liberal Arts, Yamaguchi University
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Weihua Kong
Institute of Biological Science, Shandong University
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Kumagai Kanji
Biological Institute, Faculty of Liberal Arts, Yamaguchi University
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Weihua Kong
Institute Of Biological Science Shandong University
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Kumagai K
Biological Institute Faculty Of Liberal Arts Yamaguchi University
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Fujimoto Y
Department Of Chemistry And Materials Science Tokyo Institute Of Technology
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Yamanaka Akira
Institute Of Biological Science Faculty Of Science Yamaguchi University
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