On the monoterpene emission under heat stress and on the increased thermotolerance of Quercus ilex L. fumigated with selected monoterpenes
Leaves of the monoterpene emitter Quercus ilex were exposed to a temperature ramp with 5 C steps from 30 C to 55 C while maintained under conditions in which endogenous emission of monoterpenes was allowed or suppressed, or under fumigation with exogenous selected monoterpenes. Fumigation with monoterpenes reduced the decline of photosynthesis and photorespiration found in non-fumigated leaves exposed to high temperatures. It also increased respiration when photosynthesis and photorespiration were inhibited by low O(2) and CO(2)-free air. Finally, fumigation allowed for a more rapid recovery of photosynthesis and monoterpene emission when the 30 C temperature was restored, These results indicate that, as previously reported for isoprene, monoterpenes may help plants to cope with heat stress. Membrane stability may be enhanced by monoterpenes therefore causing a rather non-specific stimulation of photosynthesis.
Bibliographic Reference: Article: Plant, Cell and Environment
Record Number: 199810592 / Last updated on: 1998-05-12
Original language: en
Available languages: en