2018年2月1日
Respiration of thermogenic inflorescences of skunk cabbage Symplocarpus renifolius in heliox
Plant Cell & Environment
- ,
- ,
- 巻
- 41
- 号
- 2
- 開始ページ
- 367
- 終了ページ
- 373
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1111/pce.13097
- 出版者・発行元
- Blackwell Publishing Ltd
The respiration rate of the thermogenic inflorescences of Japanese skunk cabbage Symplocarpus renifolius can reach 300 nmol s−1 g−1, which is sufficient to raise spadix temperature (Ts) up to 15 °C above ambient air temperature (Ta). Respiration rate is inversely related to Ta, such that the Ts achieves a degree of independence from Ta, an effect known as temperature regulation. Here, we measure oxygen consumption rate (Ṁo2) in air (21% O2 in mainly N2) and in heliox (21% O2 in He) to investigate the diffusive conductance of the network of gas-filled spaces and the thermoregulatory response. When Ts was clamped at 15 °C, the temperature that produces maximal Ṁo2 in this species, exposure to high diffusivity heliox increased mean Ṁo2 significantly from 137 ± 17 to 202 ± 43 nmol s−1 g−1 FW, indicating that respiration in air is normally limited by diffusion in the gas phase and some mitochondria are unsaturated. When Ta was clamped at 15 °C and Ts was allowed to vary, exposure to heliox reduced Ts 1 °C and increased Ṁo2 significantly from 116 ± 10 to 137 ± 19 nmol s−1 g−1, indicating that enhanced heat loss by conduction and convection can elicit the thermoregulatory response.
- ID情報
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- DOI : 10.1111/pce.13097
- ISSN : 1365-3040
- ISSN : 0140-7791
- PubMed ID : 29121698
- SCOPUS ID : 85035196029