論文

査読有り
2018年2月1日

Respiration of thermogenic inflorescences of skunk cabbage Symplocarpus renifolius in heliox

Plant Cell & Environment
  • Roger S. Seymour
  • ,
  • Kikukatsu Ito
  • ,
  • Yui Umekawa

41
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.

リンク情報
DOI
https://doi.org/10.1111/pce.13097
PubMed
https://www.ncbi.nlm.nih.gov/pubmed/29121698
ID情報
  • DOI : 10.1111/pce.13097
  • ISSN : 1365-3040
  • ISSN : 0140-7791
  • PubMed ID : 29121698
  • SCOPUS ID : 85035196029

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