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- Title
De novo post-illumination monoterpene burst in Quercus ilex (holm oak).
- Authors
Srikanta Dani, K.; Marino, Giovanni; Taiti, Cosimo; Mancuso, Stefano; Atwell, Brian; Loreto, Francesco; Centritto, Mauro
- Abstract
Main conclusion : Explicit proof for de novo origin of a rare post-illumination monoterpene burst and its consistency under low O , 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 CO labelling, we show that PiMB is made from freshly fixed carbon. PiMB is rare at ambient (20%) O, absent at high (50%) O, and becomes consistent in leaves exposed to low (2%) O. PiMB is stronger and occurs earlier at higher temperatures. We also show that primary and secondary post-illumination CO bursts (PiCOB) are sensitive to O in Q. ilex. The primary photorespiratory PiCOB is absent under both ambient and low O, but is induced under high (>50%) O, while the secondary PiCOB (of unknown origin) is absent under ambient, but present at low and high O. We propose that post-illumination recycling of photorespired CO competes with the MEP pathway for photosynthetic carbon and energy, making PiMB rare under ambient O and absent at high O. PiMB becomes consistent when photorespiration is suppressed in Q. ilex.
- Subjects
MONOTERPENES; HOLM oak; PLANT photorespiration; PHOTOSYNTHESIS; CHLOROPLASTS; PHYSIOLOGY
- Publication
Planta: An International Journal of Plant Biology, 2017, Vol 245, Issue 2, p459
- ISSN
0032-0935
- Publication type
Article
- DOI
10.1007/s00425-016-2636-x