Effects of background light conditions on thermoperiodic eclosion rhythm of the onion fly, Delia antiqua
Effects of background light conditions on thermoperiodic eclosion rhythm of the onion fly, Delia antiqua
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背景光条件对洋葱蝇Delia antiqua温周期羽化节律的影响
DOI：
10.1111/ens.12034
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发表时间：
2014
影响因子：
0.9
通讯作者：
Tanaka K
中科院分区：
文献类型：
--
作者：
Watari;Y.;Tanaka K
为了阐明光照对洋葱蝇成虫羽化节律的热周期调节的影响，在连续黑暗(DD)和连续光照(LL)条件下，研究了29℃(12 h)：21℃(12 h)和25.5℃(12 h)：24.5℃(12 h)两种温度周期在连续黑暗(DD)和连续光照(LL)下的反应。无论暖期(W)和冷期(C)之间的温度阶跃如何，温度循环都有效地控制了DD和LL成虫的羽化节律。然而，羽化峰在W和C之间随光照条件和温度步长而变化，DD比LL提前约2-3 h，且在较小的温度步长下。背景光条件和温度步长也影响羽化节律的幅度。在较小的温度步长下，LL比DD的温度低。在转移到恒温(25℃)时，DD在8℃的温度台阶上最早激发羽化节律，而在LL的1℃温度台阶上最晚激发羽化节律。在1℃温阶和8℃温阶下，DD组和LL组的蛹表现出中等反应，但前者比后者提前1 d开始羽化节律。这可能归因于热周期条件下背景光与温度阶跃的相互作用。结果表明，连续光照和较小的温度阶跃减弱了羽化节律与温度周期之间的耦合强度，但光照效应强于温度阶跃效应。
To elucidate the effects of light on thermoperiodic regulation of adult eclosion rhythm in the onion fly,Delia antiqua, the responses to two thermoperiods, 29°C (12 h):21°C (12 h) and 25.5°C (12 h):24.5°C (12 h), with different amplitude and same average temperature, were examined in continuous darkness (DD) and continuous light (LL). Irrespective of the temperature step between warm phase (W) and cool phase (C), temperature cycles effectively entrained the adult eclosion rhythm in both DD and LL. Eclosion peaks, however, varied with light conditions and temperature step between W and C. It advanced by approximately 2–3 h in DD than in LL and at smaller temperature step. Background light conditions and temperature step also affect the amplitude of eclosion rhythm. It became lower in LL than in DD and at smaller temperature steps. On transfer to constant temperature (25°C), eclosion rhythm was elicited earliest in the pupae at 8°C temperature step in DD and latest in those at 1°C temperature step in LL. Pupae at 1°C temperature step in DD and at 8°C temperature step in LL demonstrated intermediate responses, but the eclosion rhythm was elicited 1 day earlier in the former than in the latter. This might be ascribed to the interaction between background light and temperature step under thermoperiodic conditions. The results suggest that continuous light and a smaller temperature step weaken the coupling strength between eclosion rhythm and thermoperiod, but the light effect is stronger than the temperature step effect.