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Báo cáo sinh học: " Ethanol and acetic-acid tolerance in Indian geographical populations of Drosophila immigrans"

Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí sinh học Journal of Biology đề tài: Ethanol and acetic-acid tolerance in Indian geographical populations of Drosophila immigrans | Genet Sei Evol 1994 26 401-411 Elsevier INRA 401 Original article Ethanol and acetic-acid tolerance in Indian geographical populations of Drosophila hnmigrans R Parkash Neena Shamina Department of Biosciences Maharshi Dayanand University Rohtak 124001 India Received 10 September 1993 accepted 25 March 1994 Summary - Indian geographical populations of Drosophila immigrans revealed a lack of allozymic variation at the alcohol dehydrogenase locus. Latitudinal clines of ethanol tolerance 1.5-4.2 and acetic-acid tolerance 2.9-4.9 were observed in adult individuals of 4 geographical populations of Drosophila immigrans. Thus both ethanol and acetic-acid tolerance decreased towards the equator. The parallel patterns of utilisation of ethanol and acetic acid seem to be correlated with the concentrations of these 2 metabolites in natural food resources. Thus intra-specific differences for ethanol and acetic-acid tolerance could be adaptively maintained by spatially varying fermenting habitats along the north-south axis of the Indian sub-continent. ethanol tolerance acetic-acid tolerance clinal variation geographical population Drosophila immigrans Resume Tolerance à 1 éthanol et à 1 acide acétique de populations géographiques de Drosophila immigrans. Des populations géographiques de Drosophila immigrans ont révélé une absence de variation allozymique au locus de la déshydrogénase alcoolique. Des clines latitudinaux de tolerance à l éthanol de 1 5 à 4 2 et à I acide acétique de 2 9 à 4 9 ont été observes chez les adultes de 4 populations géographiques de D immigrans. La tolerance à l éthanol et à I acide acétique décroỉt quand on se rapproche de 1 équateur. Les modes d utilisation de 1 éthanol et de I acide acétique sont parallèles et semblent lies aux concentrations de ces 2 metabolites dans les ressources alimentaires naturelies. Ainsi les differences intraspecifiques de tolerance à ces substances pourraient-elles être maintenues sous I effet de la selection naturelie dans