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Titolo:
Effects of photoperiod on pituitary gonadotropin levels in masu salmon
Autore:
Amano, M; Ikuta, K; Kitamura, S; Aida, K;
Indirizzi:
Natl Res Inst Aquaculture, Nikko Branch, Nikko, Tochigi, Japan Natl Res Inst Aquaculture Nikko Tochigi Japan nch, Nikko, Tochigi, Japan Univ Tokyo, Grad Sch Agr & Life Sci, Dept Aquat Biosci, Tokyo, Japan Univ Tokyo Tokyo Japan Agr & Life Sci, Dept Aquat Biosci, Tokyo, Japan
Titolo Testata:
JOURNAL OF EXPERIMENTAL ZOOLOGY
fascicolo: 7, volume: 289, anno: 2001,
pagine: 449 - 455
SICI:
0022-104X(20010601)289:7<449:EOPOPG>2.0.ZU;2-P
Fonte:
ISI
Lingua:
ENG
Soggetto:
TROUT ONCORHYNCHUS-MYKISS; FEMALE RAINBOW-TROUT; MESSENGER-RNA LEVELS; GTH-II; MOLECULAR-CLONING; BETA-SUBUNIT; COHO SALMON; REPRODUCTIVE-CYCLE; GENE-EXPRESSION; ALPHA-SUBUNIT;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Life Sciences
Citazioni:
31
Recensione:
Indirizzi per estratti:
Indirizzo: Amano, M Kitasato Univ, Sch Fisheries Sci, Sanri Ku, Iwate 0220101, Japan Kitasato Univ Iwate Japan 0220101 anri Ku, Iwate 0220101, Japan
Citazione:
M. Amano et al., "Effects of photoperiod on pituitary gonadotropin levels in masu salmon", J EXP ZOOL, 289(7), 2001, pp. 449-455

Abstract

We examined the effects of photoperiod on pituitary levels of two types ofgonadotropin (GTH), GTH I and GTH II, in masu salmon Oncorhynchus masou tostudy their mechanism of synthesis. In Experiment 1, the effects of long or short photoperiod combined with castration were examined using 8-month-old precocious males. Castration was carried out in early August and then thefish were reared under a short (8L16D) or long (16L8D) photoperiod for 60 days. In Experiment 2, the effects of photoperiod combined with testosterone treatment were examined using 12-month-old immature females. Silastic tubes containing testosterone (500 mug/fish) or vehicle were implanted intra-peritoneally in early October. Fish were reared under 16L8D for 60 days, andthen half of the fish were transferred to 8L16D, while the remaining fish were kept under 16L8D until Day 90. In Experiment 1, GTH I contents were higher under 16L8D than under 8L16D in the castrated group on Day 30. Moreover, GTH I contents were higher in the castrated group than the control groupunder 16L8D on Day 30. GTH II contents increased with testicular maturation in the control groups, whereas they remained at low levels in the castrated groups regardless of photoperiodic treatment. In Experiment 2, GTH I contents did not change remarkably in all the groups, while GTH II contents were remarkably increased by testosterone treatment regardless of photoperiodic treatment. These results indicate that the synthesis of GTH I and GTH IIare differently regulated by photoperiod and testosterone in masu salmon. J. Exp. Zool. 289:449-455, 2001. (C) 2001 Wiley-Liss, Inc.

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Documento generato il 27/01/20 alle ore 01:16:37