Temperature-triggered periodical thermogenic oscillations in skunk cabbage (Symplocarpus foetidus)
Temperature-triggered periodical thermogenic oscillations in skunk cabbage (Symplocarpus foetidus)
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DOI：
10.1093/pcp/pch038
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发表时间：
2004-03-01
影响因子：
4.9
通讯作者：
Uemura, M
中科院分区：
文献类型：
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作者：
Ito, K;Ito, T;Uemura, M
在臭白菜（Symplocarpus foetidus）的花苞中，发现了自然发生的温度触发和不依赖于光的产热振荡。所鉴定的产热振荡器具有精确的周期（每周期约60 min），对蝶骨温度的升高或降低有明显的响应，阈值小于0.9℃。无论是恒定的环境空气温度，还是10分钟内环境空气温度的短暂变化（19°c—15°c—19°c），都不会引起孢子内的温度振荡。此外，温度振荡的周期与鸡块的重量（2.5 ~ 9.2 g）无关，其振幅与鸡块温度变化的幅度相关。这些结果表明，黄花鸡翅的周期性温度振荡具有一个定量的调节过程，涉及温度感觉和随后的产热。基于这些结果，我们提出了一个随时间变化的产热振荡模型，该模型在动态环境温度变化下充当精确的热调节器。
The natural occurrence of temperature-triggered and light-independent thermogenic oscillation in the spadix of skunk cabbage, Symplocarpus foetidus, was discovered. The identified thermogenic oscillator had an accurate periodical cycle (ca. 60 min per cycle) that apparently responded to an increase or decrease in the spadix temperature with a threshold of less than 0.9degreesC. Neither a constant ambient air temperature nor transient changes in the ambient air temperature within 10 min (19degreesC --> 15degreesC --> 19degreesC) induced the temperature oscillation in the spadix. Moreover, the periodical cycles were independent of the weight of the spadix (2.5-9.2 g) and the amplitudes of the temperature oscillations were correlated with the magnitude of the changes in the spadix temperatures. These results imply that periodical temperature oscillations in the spadix of S. foetidus possess a quantitative regulatory process that involves a temperature sensation and subsequent heat production. Based on these results, we propose a time-dependent thermogenic oscillatory model that acts as a precise thermal regulator under dynamic environmental temperature changes.