||Effects of Environmental Conditions on Isoprene Emission from Live Oak.
Tingey, David T. ;
Evans, Rosemary ;
Gumpertz, Marcia ;
||National Heart, Lung, and Blood Inst., Bethesda, MD.
Oak trees ;
Carbon dioxide ;
Aliphatic hydrocarbons ;
Luminous intensity ;
||Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy.
Live-oak plants (Quercus virginia) were subjected to various levels of CO2, water stress or photosynthetic photon flux density to test the hypothesis that isoprene biosynthesis occurred only under conditions of restricted CO2 availability. Isoprene emission increases as the ambient CO2 concentration decreased, independent of the amount of time that plants had photosynthesized at ambient CO2 levels. When plants are water-stressed over a 4-d period photosynthesis and leaf conductance decreased 98 and 94%, respectively, while isoprene emissions remained constant. These data indicate that isoprene is a normal plant metabolite.