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Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.14/1247560
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- Title
- De novo post-illumination monoterpene burst in Quercus ilex (holm oak)
- Related
- Planta, Vol. 245, Issue 2, (2017), p.459-465
- DOI
- 10.1007/s00425-016-2636-x
- Publisher
- Springer
- Date
- 2017
- Author/Creator
- Dani, K. G. Srikanta
- Author/Creator
- Marino, Giovanni
- Author/Creator
- Taiti, Cosimo
- Author/Creator
- Mancuso, Stefano
- Author/Creator
- Atwell, Brian J
- Author/Creator
- Loreto, Francesco
- Author/Creator
- Centritto, Mauro
- Description
- Explicit proof for de novo origin of a rare post-illumination monoterpene burst and its consistency under low O₂, shows interaction of photorespiration, photosynthesis, and isoprenoid biosynthesis during light–dark transitions. Quercus ilex L (holm oak) constitutively emits foliar monoterpenes in an isoprene-like fashion via the methyl erythritol phosphate (MEP) pathway located in chloroplasts. Isoprene-emitting plants are known to exhibit post-illumination isoprene burst, a transient emission of isoprene in darkness. An analogous post-illumination monoterpene burst (PiMB) had remained elusive and is reported here for the first time in Q. ilex. Using ¹³CO₂ labelling, we show that PiMB is made from freshly fixed carbon. PiMB is rare at ambient (20%) O₂, absent at high (50%) O₂, and becomes consistent in leaves exposed to low (2%) O₂. PiMB is stronger and occurs earlier at higher temperatures. We also show that primary and secondary post-illumination CO₂bursts (PiCO₂B) are sensitive to O₂ in Q. ilex. The primary photorespiratory PiCO₂B is absent under both ambient and low O₂, but is induced under high (>50%) O₂, while the secondary PiCO₂B (of unknown origin) is absent under ambient, but present at low and high O₂. We propose that post-illumination recycling of photorespired CO₂ competes with the MEP pathway for photosynthetic carbon and energy, making PiMB rare under ambient O₂ and absent at high O₂. PiMB becomes consistent when photorespiration is suppressed in Q. ilex.
- Description
- 7 page(s)
- Subject Keyword
- ¹³CO₂ labelling
- Subject Keyword
- light-dark transition
- Subject Keyword
- MEP pathway
- Subject Keyword
- Monoterpene emission
- Subject Keyword
- Post-illumination bursts
- Subject Keyword
- Photosynthesis
- Subject Keyword
- Photorespiratory CO₂ recycling
- Resource Type
- journal article
- Organisation
- Macquarie University. Department of Biological Sciences
- Identifier
- http://hdl.handle.net/1959.14/1247560
- Identifier
- mq:68765
- Identifier
- ISSN:0032-0935
- Identifier
- mq-rm-2014010018
- Identifier
- mq_res-se-571945
- Language
- eng
- Reviewed
Macquarie University ResearchOnline
