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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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