期刊
JOURNAL OF INSECT PHYSIOLOGY
卷 51, 期 6, 页码 661-667出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jinsphys.2005.03.011
关键词
photoperiodism; timeless; circadian rhythm; stage of diapause; latitude
资金
- NIGMS NIH HHS [2T32 GM 07413-26] Funding Source: Medline
Expression of the circadian rhythm gene timeless was investigated in the pitcher-plant mosquito, Wyeomyia smithii (Coq.), and was found to vary with time of day, instar of diapause, and latitude of origin. The temporal pattern of timeless expression differed between the two diapausing instars and was significantly higher in southern (38-40 degrees N) than in northern (50 degrees N) populations, when diapausing instar was held constant. Expression of timeless is therefore both developmentally and evolutionarily variable. This result provides the first example of a latitudinal difference in the expression of timeless, suggesting that, along with evidence from other insects, timeless has the potential to affect photoperiodic response and its adaptive evolution in temperate seasonal environments. (c) 2005 Elsevier Ltd. All rights reserved.
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