Interactions between temperature effects and genotype on Oreochromis niloticus sex determination
In thermosensitive reptiles, extreme temperatures change the sex of all individuals, but there is no definitive demonstration of a genetic sex determination. In thermosensitive amphibians, sex chromosomes determine the sex at basal temperatures, while extreme temperatures totally override the genetic sex determination. In gonochoristic fish, very few studies have assessed the influence of temperature on sex differentiation in the Cichlid fish, #Oreochromis niloticus#, sex is determined by genetic factors, temperature levels, and genotype-temperature interactions. In order to analyse these interactions, thermosensitivity was examined in all the #O. niloticus# progenies from a diallele-type crosses using 5 males and 5 females: 70 different experimental groups of 150 fish were subjected for 30 days to a basal temperature (27°C) or to a high temperature treatment (36°C) during the thermosensitive period. Sex-ratios were determined on 7000 fish. Male proportions were significantly enhanced by high temperature treatment in 37% of the breeding combinations; among them, 98-100% males were produced in 2 different progenies. In these groups, temperature totally override the genetic sex determination. In the 63% other combinations, where an absence of thermosensitivity was observed, 9-18% of the sterile individuals were recorded in 2 different progenies. Interestingly, as female (but not male) proportions were significantly reduced in these 2 groups, we hypothesize that genetic females were mainly (if not only) affected by this thermal sterilization. Statiscal analysis of sex-ratio from the diallele-type crosses suggest additive effects. The induction of sterile gonads in some rare individuals is discussed.
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Subjects: | L53 - Physiologie animale - Reproduction, L52 - Physiologie animale - Croissance et développement, Oreochromis niloticus, différenciation sexuelle, détermination du sexe, intéraction génotype environnement, température, http://aims.fao.org/aos/agrovoc/c_34687, http://aims.fao.org/aos/agrovoc/c_26822, http://aims.fao.org/aos/agrovoc/c_14226, http://aims.fao.org/aos/agrovoc/c_24577, http://aims.fao.org/aos/agrovoc/c_7657, |
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dig-cirad-fr-3898932024-01-27T23:07:39Z http://agritrop.cirad.fr/389893/ http://agritrop.cirad.fr/389893/ Interactions between temperature effects and genotype on Oreochromis niloticus sex determination. Baroiller Jean-François, Clota Frédéric. 1997. In : Proceedings of the first international symposium on the biology of vertebrate sex determination = [Actes du premier symposium international sur la détermination biologique du sexe des vertébrés]. Anon. s.l. : s.n., 8. International Symposium on the Biology of Vertebrate Sex Determination. 1, Honolulu, États-Unis, 7 Avril 1997/11 Avril 1997. Interactions between temperature effects and genotype on Oreochromis niloticus sex determination Baroiller, Jean-François Clota, Frédéric eng 1997 s.n. Proceedings of the first international symposium on the biology of vertebrate sex determination = [Actes du premier symposium international sur la détermination biologique du sexe des vertébrés] L53 - Physiologie animale - Reproduction L52 - Physiologie animale - Croissance et développement Oreochromis niloticus différenciation sexuelle détermination du sexe intéraction génotype environnement température http://aims.fao.org/aos/agrovoc/c_34687 http://aims.fao.org/aos/agrovoc/c_26822 http://aims.fao.org/aos/agrovoc/c_14226 http://aims.fao.org/aos/agrovoc/c_24577 http://aims.fao.org/aos/agrovoc/c_7657 In thermosensitive reptiles, extreme temperatures change the sex of all individuals, but there is no definitive demonstration of a genetic sex determination. In thermosensitive amphibians, sex chromosomes determine the sex at basal temperatures, while extreme temperatures totally override the genetic sex determination. In gonochoristic fish, very few studies have assessed the influence of temperature on sex differentiation in the Cichlid fish, #Oreochromis niloticus#, sex is determined by genetic factors, temperature levels, and genotype-temperature interactions. In order to analyse these interactions, thermosensitivity was examined in all the #O. niloticus# progenies from a diallele-type crosses using 5 males and 5 females: 70 different experimental groups of 150 fish were subjected for 30 days to a basal temperature (27°C) or to a high temperature treatment (36°C) during the thermosensitive period. Sex-ratios were determined on 7000 fish. Male proportions were significantly enhanced by high temperature treatment in 37% of the breeding combinations; among them, 98-100% males were produced in 2 different progenies. In these groups, temperature totally override the genetic sex determination. In the 63% other combinations, where an absence of thermosensitivity was observed, 9-18% of the sterile individuals were recorded in 2 different progenies. Interestingly, as female (but not male) proportions were significantly reduced in these 2 groups, we hypothesize that genetic females were mainly (if not only) affected by this thermal sterilization. Statiscal analysis of sex-ratio from the diallele-type crosses suggest additive effects. The induction of sterile gonads in some rare individuals is discussed. conference_item info:eu-repo/semantics/conferenceObject Conference info:eu-repo/semantics/closedAccess http://catalogue-bibliotheques.cirad.fr/cgi-bin/koha/opac-detail.pl?biblionumber=89719 |
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L53 - Physiologie animale - Reproduction L52 - Physiologie animale - Croissance et développement Oreochromis niloticus différenciation sexuelle détermination du sexe intéraction génotype environnement température http://aims.fao.org/aos/agrovoc/c_34687 http://aims.fao.org/aos/agrovoc/c_26822 http://aims.fao.org/aos/agrovoc/c_14226 http://aims.fao.org/aos/agrovoc/c_24577 http://aims.fao.org/aos/agrovoc/c_7657 L53 - Physiologie animale - Reproduction L52 - Physiologie animale - Croissance et développement Oreochromis niloticus différenciation sexuelle détermination du sexe intéraction génotype environnement température http://aims.fao.org/aos/agrovoc/c_34687 http://aims.fao.org/aos/agrovoc/c_26822 http://aims.fao.org/aos/agrovoc/c_14226 http://aims.fao.org/aos/agrovoc/c_24577 http://aims.fao.org/aos/agrovoc/c_7657 |
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L53 - Physiologie animale - Reproduction L52 - Physiologie animale - Croissance et développement Oreochromis niloticus différenciation sexuelle détermination du sexe intéraction génotype environnement température http://aims.fao.org/aos/agrovoc/c_34687 http://aims.fao.org/aos/agrovoc/c_26822 http://aims.fao.org/aos/agrovoc/c_14226 http://aims.fao.org/aos/agrovoc/c_24577 http://aims.fao.org/aos/agrovoc/c_7657 L53 - Physiologie animale - Reproduction L52 - Physiologie animale - Croissance et développement Oreochromis niloticus différenciation sexuelle détermination du sexe intéraction génotype environnement température http://aims.fao.org/aos/agrovoc/c_34687 http://aims.fao.org/aos/agrovoc/c_26822 http://aims.fao.org/aos/agrovoc/c_14226 http://aims.fao.org/aos/agrovoc/c_24577 http://aims.fao.org/aos/agrovoc/c_7657 Baroiller, Jean-François Clota, Frédéric Interactions between temperature effects and genotype on Oreochromis niloticus sex determination |
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In thermosensitive reptiles, extreme temperatures change the sex of all individuals, but there is no definitive demonstration of a genetic sex determination. In thermosensitive amphibians, sex chromosomes determine the sex at basal temperatures, while extreme temperatures totally override the genetic sex determination. In gonochoristic fish, very few studies have assessed the influence of temperature on sex differentiation in the Cichlid fish, #Oreochromis niloticus#, sex is determined by genetic factors, temperature levels, and genotype-temperature interactions. In order to analyse these interactions, thermosensitivity was examined in all the #O. niloticus# progenies from a diallele-type crosses using 5 males and 5 females: 70 different experimental groups of 150 fish were subjected for 30 days to a basal temperature (27°C) or to a high temperature treatment (36°C) during the thermosensitive period. Sex-ratios were determined on 7000 fish. Male proportions were significantly enhanced by high temperature treatment in 37% of the breeding combinations; among them, 98-100% males were produced in 2 different progenies. In these groups, temperature totally override the genetic sex determination. In the 63% other combinations, where an absence of thermosensitivity was observed, 9-18% of the sterile individuals were recorded in 2 different progenies. Interestingly, as female (but not male) proportions were significantly reduced in these 2 groups, we hypothesize that genetic females were mainly (if not only) affected by this thermal sterilization. Statiscal analysis of sex-ratio from the diallele-type crosses suggest additive effects. The induction of sterile gonads in some rare individuals is discussed. |
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L53 - Physiologie animale - Reproduction L52 - Physiologie animale - Croissance et développement Oreochromis niloticus différenciation sexuelle détermination du sexe intéraction génotype environnement température http://aims.fao.org/aos/agrovoc/c_34687 http://aims.fao.org/aos/agrovoc/c_26822 http://aims.fao.org/aos/agrovoc/c_14226 http://aims.fao.org/aos/agrovoc/c_24577 http://aims.fao.org/aos/agrovoc/c_7657 |
author |
Baroiller, Jean-François Clota, Frédéric |
author_facet |
Baroiller, Jean-François Clota, Frédéric |
author_sort |
Baroiller, Jean-François |
title |
Interactions between temperature effects and genotype on Oreochromis niloticus sex determination |
title_short |
Interactions between temperature effects and genotype on Oreochromis niloticus sex determination |
title_full |
Interactions between temperature effects and genotype on Oreochromis niloticus sex determination |
title_fullStr |
Interactions between temperature effects and genotype on Oreochromis niloticus sex determination |
title_full_unstemmed |
Interactions between temperature effects and genotype on Oreochromis niloticus sex determination |
title_sort |
interactions between temperature effects and genotype on oreochromis niloticus sex determination |
publisher |
s.n. |
url |
http://agritrop.cirad.fr/389893/ |
work_keys_str_mv |
AT baroillerjeanfrancois interactionsbetweentemperatureeffectsandgenotypeonoreochromisniloticussexdetermination AT clotafrederic interactionsbetweentemperatureeffectsandgenotypeonoreochromisniloticussexdetermination |
_version_ |
1792491253222342656 |