Cold tolerance and metabolic rate increased by cold acclimation in Drosophila albomicans from natural populations.
Cold tolerance and metabolic rate increased by cold acclimation in Drosophila albomicans from natural populations.
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DOI：
10.1266/ggs.88.289
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发表时间：
2013-10
影响因子：
1.1
通讯作者：
K. Isobe;Aya Takahashi;K. Tamura
中科院分区：
文献类型：
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作者：
K. Isobe;Aya Takahashi;K. Tamura
冷驯化是昆虫温度适应的重要因素之一，昆虫需要迅速适应环境温度的季节性变化。在一个果蝇物种，果蝇albomicans，它有一个热带起源，目前有广泛的地理分布延伸到亚洲温带地区，在1℃的生存时间方面的耐寒性在25℃饲养的成年苍蝇，大大提高了在20℃的冷驯化几天。检查29 isofemale线从广泛分布的自然种群，我们观察到一个很大的变化，他们的驯化反应。然而，驯化反应不一定是强的菌株，最近殖民温带地区。一个显着更强的驯化反应时，检测到雄性苍蝇的温带品系相比，热带品系。D. albomicans也表现出较强的耐寒性比其密切相关的物种属于D. nasuta亚群在这些菌株中，我们检测到的耐冷性变化和代谢率的变化之间的强正相关，在冷驯化，这表明它们之间的强烈的生理关联由共同的遗传因素调节，这可能是自然选择的目标，温度适应。对去适应和再适应的反应表明，基因表达的系统变化是冷驯化影响耐冷性和代谢率变化的主要分子机制。
Cold acclimation is one of the important factors in temperature adaptation for insects needing to make rapid adjustment to the seasonal temperature changes in their living environment. In a fruit fly species, Drosophila albomicans, which has a tropical origin and currently has a wide geographic distribution extended into Asian temperate regions, cold tolerance in terms of survival time at 1℃ of adult flies reared at 25℃ was substantially improved by a cold acclimation at 20℃ for several days. Examining 29 isofemale lines from widely distributed natural populations, we observed a substantial variation in their acclimation response. However, the acclimation response was not necessarily stronger in the strains from the recently colonized temperate regions. A significantly stronger acclimation response was detected in male flies of the temperate strains when compared to those of the tropical strains. D. albomicans also showed stronger cold tolerance compared to its closely related species belonging to the D. nasuta subgroup. Among these strains, we detected a strong positive correlation between the cold tolerance change and the metabolic rate change upon the cold acclimation, suggesting their strong physiological association regulated by common genetic factors, which may have been the target of natural selection for the temperature adaptation. The response to deacclimation and reacclimation suggested that a systematic change in gene expressions is the main molecular mechanism for the cold acclimation to have effects on the cold tolerance and metabolic rate changes.