Please use this identifier to cite or link to this item: https://hdl.handle.net/2440/111840
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Type: Journal article
Title: Respiration of thermogenic inflorescences of skunk cabbage Symplocarpus renifolius in heliox
Author: Seymour, R.
Ito, K.
Umekawa, Y.
Citation: Plant, Cell and Environment, 2018; 41(2):367-373
Publisher: Wiley
Issue Date: 2018
ISSN: 0140-7791
1365-3040
Statement of
Responsibility: 
Roger S. Seymour, Kikukatsu Ito, Yui Umekawa
Abstract: 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.
Keywords: Diffusion; flower; gas conductance; heliox; inflorescence; oxygen consumption; respiration; thermogenesis
Rights: © 2017 John Wiley & Sons Ltd
DOI: 10.1111/pce.13097
Grant ID: http://purl.org/au-research/grants/arc/DP0771854
Published version: http://dx.doi.org/10.1111/pce.13097
Appears in Collections:Aurora harvest 8
Earth and Environmental Sciences publications

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