Evolution of cross-tolerance to environmental stresses in populations of Drosophila melanogaster selected for increased resistance to cold stress

BioRxiv : the Preprint Server for Biology
Karan Singh, N. G. Prasad

Abstract

Empirical studies on the promiscuous speciess of Drosophila revealed that the laboratory evolution of resistance to a certain type of environmental stress can impact the ability of the organism to resist other kinds of stresses. The mechanisms of resistance to a particular stress are specialized and costly, then, mechanisms of resistance to other stresses can be negatively affected. However, it is also possible that at least a part of the stress resistance mechanisms is generic. With this premise we aimed to understand whether increased resistance to a cold stress can increase resistance to other types of stresses. To address this issue, we used populations of Drosophila melanogaster (D. melanogaster) that have been selected for 57-71 generations for increased resistance to cold shock (-5{degrees}C for one hour). We subjected the selected (FSB; selected for cold shock resistance, derived from BRB population) and control FCB; cold shock control, derived from BRB population) populations to a variety of environmental stresses such as cold shock, heat shock, starvation, desiccation and bacterial infection. We found that the compared to FCB populations, FSB populations had higher resistance to heat stress in terms of adult survivor...Continue Reading

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