Influence of light and temperature on monoterpene emission rates from slash pine

Journal Article · Thu May 01 04:00:00 EDT 1980 · Plant Physiol.; (United States)

DOI:https://doi.org/10.1104/pp.65.5.797· OSTI ID:5178628

Tingey, D T; Manning, M; Grothaus, L C; Burns, W F

There is a growing awareness of vegetation's role as a source of potentially reactive hydrocarbons that may serve as photochemical oxidant precursors. This study assessed the influence of light and temperature, independently, on monoterpene emissions from slash pine (Pinus elliottii Engelm). Plants were preconditioned in0a growth chamber, then transferred to an environmentally controlled gas exchange chamber. Samples of the chamber atmosphere were collected; the monoterpenes were concentrated cryogenically and measured by gas chromatography. Five monoterpenes (..cap alpha..-pinene, ..beta..-pinene, myrcene, limonene, and ..beta..-phellandrene) were present in the vapor phase surrounding the plants in sufficient quantity for reliable measurement. Light did not directly influence monoterpene emission rates since the emissions were similar in both the dark and at various light intensities. Monoterpene emission rates increased exponentially with temperature (i.e. emissions depend on temperature in a log-linear manner). The summed emissions of the five monoterpenes ranged from 3 to 21 micrograms C per grams dry weight per hour as temperature was increased from 20 to 46 C. Initially, emission rates from heat-stressed needles were similar to healthy needles, but rates decreased 11% per day. Daily carbon loss through monoterpene emissions accounted for approximately 0.4% of the carbon fixed during photosynthesis.

• Research Organization: Northrop Services Inc., Corvallis, OR
• OSTI ID: 5178628
• Journal Information: Plant Physiol.; (United States), Journal Name: Plant Physiol.; (United States) Vol. 65:5; ISSN PLPHA
• Country of Publication: United States
• Language: English

Related Subjects

550200* -- Biochemistry
550500 -- Metabolism
59 BASIC BIOLOGICAL SCIENCES
BIOCHEMICAL REACTION KINETICS
BIOCHEMISTRY
BIOLOGICAL EFFECTS
CHEMICAL REACTIONS
CHEMISTRY
CLEARANCE
CONIFERS
ELECTROMAGNETIC RADIATION
ENERGY
EXCRETION
HEAT
KINETICS
ORGANIC COMPOUNDS
PHOTOCHEMICAL REACTIONS
PHOTOSYNTHESIS
PINES
PLANTS
RADIATIONS
REACTION KINETICS
SYNTHESIS
TEMPERATURE EFFECTS
TERPENES
TREES
VISIBLE RADIATION