Heat- and cold-shock responses and temperature adaptations in subtropical and temperate species of Drosophila
Heat- and cold-shock responses and temperature adaptations in subtropical and temperate species of Drosophila
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DOI：
10.1016/s0022-1910(98)00101-2
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发表时间：
1998-12-01
影响因子：
2.2
通讯作者：
Kimura, MT
中科院分区：
文献类型：
--
作者：
Goto, SG;Kimura, MT
研究了 Hsp70 mRNA 的积累与三种果蝇的成年雄性的耐热性和耐冷性的关系。亚热带低地物种（D. wanabei）和冷温带物种（D. triauraria）比亚热带高地物种（D. trapezifrons）更耐热，而煤温带物种比这两个亚热带物种更耐冷。因此，耐热性和耐寒性与栖息地的温度条件有关。 D. wanabei 在热和冷时诱导 Hsp70 mRNA 的阈值温度高于 D. trapezifrons 或 D. triauraria，但后两个物种之间没有差异，尽管它们的耐热性和耐冷性存在差异。在 D. trapezifrons 中，暴露于 0 摄氏度 12 小时和 6 摄氏度 24 小时会杀死约 40% 的个体，但前一种处理诱导了 Hsp70 mRNA，而后者则没有。因此，在所研究的物种中，热脱壳反应和冷脱壳反应与温度耐受性之间的关系并不严格。在 D. triauraria 中，当在较低温度下饲养时，在热和冷时诱导 Hsp70 mRNA 的阈值温度较低。 (C) 1998 Elsevier Science Ltd. 保留所有权利。
Accumulation of Hsp70 mRNA was investigated with relation to heat and cold tolerance in adult males of three Drosophila species. The subtropical lowland species (D. watanabei) and the cool-temperate species (D. triauraria) were more tolerant to heat than the subtropical highland species (D. trapezifrons), and the coal-temperate species were much more tolerant to cold than the two subtropical species. Thus, heat and cold tolerance was related to temperature conditions in the habitats. The threshold temperatures for the induction of Hsp70 mRNA at heat and cold were higher in D. watanabei than in D. trapezifrons or D. triauraria, but were not different between the latter two species in spite of the difference in their heat and cold tolerance. In D. trapezifrons, exposures to 0 degrees C for 12 h and 6 degrees C for 24 h killed about 40% of individuals, but the former treatment induced Hsp70 mRNA while the latter one did not. Thus, the relation between the heat- and cold-shuck responses and temperature tolerance was not rigid in the species studied. In D. triauraria, the threshold temperatures for the induction of Hsp70 mRNA at heat and cold were lower when reared at a lower temperature. (C) 1998 Elsevier Science Ltd. All rights reserved.