您现在的位置： 荒漠生态综合整治技术推广系统>> 知识查询>> 文献查询>>正文内容

Direct and correlated responses to artificial selection for high and low knockdown resistance to high temperature in Drosophila buzzatii

点击数： 【字体：小 大】 【收藏】 【打印文章】

　

Abstract
Knockdown resistance to high temperature (KRHT) is a genetically variable trait for thermal adaptation in insects. Selection for KRHT may affect a number of fitness components as well as resistance to several forms of environmental stress. To test for heritable (co)-variation in KRHT, we examined direct and correlated responses to bi-directional selection on this trait in Drosophila buzzatii. Replicated lines were artificially selected for decreased and increased KRHT. After 12 generations of artificial selection, lines diverged significantly for high KRHT only. Starvation resistance increased in two lines that strongly responded to selection for high KRHT, and these two lines also showed relatively longer chill-coma recovery time. Developmental time and body size showed no correlated responses to KRHT-selection. These results suggest that KRHT is a heritable trait that can evolve towards increased thermotolerance with no genetic trade-offs associated to starvation resistance, developmental time and body size.
Article Outline
1. Introduction
2. Materials and methods
2.1. Base population
2.2. Heat-knockdown resistance and selection regime
2.3. Chill-coma recovery
2.4. Starvation resistance
2.5. Developmental time and body size
2.6. Statistical analysis
3. Results
4. Discussion
Acknowledgements
References

 

DOWNLOAD




作者：Sambucetti, Pablo, Scannapieco, Alejandra C., Norry, Fabian M. 来源：Elsevier 发布时间：2011年07月13日

相关信息