Thermogenic respiratory processes drive the exponential increase of volatile organic compound emissions in Macrozamia cycad cones

Terry, L. Irene, Roemer, Robert B., Booth, David T., Moore, Chris J. and Walter, Gimme H. (2016) Thermogenic respiratory processes drive the exponential increase of volatile organic compound emissions in Macrozamia cycad cones. Plant, Cell and Environment, 39 7: 1588-1600. doi:10.1111/pce.12730


Author Terry, L. Irene
Roemer, Robert B.
Booth, David T.
Moore, Chris J.
Walter, Gimme H.
Title Thermogenic respiratory processes drive the exponential increase of volatile organic compound emissions in Macrozamia cycad cones
Formatted title
Thermogenic respiratory processes drive the exponential increase of volatile organic compound emissions in Macrozamia cycad cones
Journal name Plant, Cell and Environment   Check publisher's open access policy
ISSN 1365-3040
0140-7791
Publication date 2016-07
Year available 2016
Sub-type Article (original research)
DOI 10.1111/pce.12730
Open Access Status Not Open Access
Volume 39
Issue 7
Start page 1588
End page 1600
Total pages 13
Place of publication Chichester, West Sussex, United Kingdom
Publisher Wiley-Blackwell Publishing
Collection year 2017
Language eng
Formatted abstract
An important outcome of plant thermogenesis is increased emissions of volatiles that mediate pollinator behaviour. We investigated whether the large increase in emissions, mainly the monoterpene ß-myrcene (>90%), during daily thermogenic events of Macrozamia macleayi and lucida cycad cones are due solely to the influence of high cone temperatures or are, instead, a result of increased respiratory rates during thermogenesis. We concurrently measured temperature, oxygen consumption and ß-myrcene emission profiles during thermogenesis of pollen cones under typical environmental temperatures and during experimental manipulations of cone temperatures and aerobic conditions, all in the dark. The exponential rise in ß-myrcene emissions never occurred without a prior, large increase in respiration, whereas an increase in cone temperature alone did not increase emissions. When respiration during thermogenesis was interrupted by anoxic conditions, ß-myrcene emissions decreased. The increased emission rates are not a result of increased cone temperature per se (through increased enzyme activity or volatilization of stored volatiles) but are dependent on biosynthetic pathways associated with increased respiration during thermogenesis that provide the carbon, energy (ATP) and reducing compounds (NADPH) required for ß-myrcene production through the methylerythritol phosphate (MEP) pathway. These findings establish the significant contribution of respiration to volatile production during thermogenesis.
Keyword Macrozamia cycads
MEP pathway
Monoterpenes
Respiration
Thermogenesis
Volatile emissions
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: HERDC Pre-Audit
School of Biological Sciences Publications
 
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