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Thermotolerance of Leaf Discs from Four Isoprene-Emitting Species Is Not Enhanced by Exposure to Exogenous Isoprene1

Barry A. Logan2, * and Russell K. Monson

Department of Environmental, Population, and Organismic Biology, University of Colorado, Boulder, Colorado 80309-0334

The effects of exogenously supplied isoprene on chlorophyll fluorescence characteristics were examined in leaf discs of four isoprene-emitting plant species, kudzu (Pueraria lobata [Willd.] Ohwi.), velvet bean (Mucuna sp.), quaking aspen (Populus tremuloides Michx.), and pussy willow (Salix discolor Muhl). Isoprene, supplied to the leaves at either 18 µL L-1 in compressed air or 21 µL L-1 in N2, had no effect on the temperature at which minimal fluorescence exhibited an upward inflection during controlled increases in leaf-disc temperature. During exposure to 1008 µmol photons m-2 s-1 in an N2 atmosphere, 21 µL L-1 isoprene had no effect on the thermally induced inflection of steady-state fluorescence. The maximum quantum efficiency of photosystem II photochemistry decreased sharply as leaf-disc temperature was increased; however, this decrease was unaffected by exposure of leaf discs to 21 µL L-1 isoprene. Therefore, there were no discernible effects of isoprene on the occurrence of symptoms of high-temperature damage to thylakoid membranes. Our data do not support the hypothesis that isoprene enhances leaf thermotolerance.

1   This study was supported by National Research Initiative Competitive Grants Program/U.S. Department of Agriculture award no. 97-35100-4418 and National Science Foundation award no. DBI9413218.
2   Present address: Department of Biology, Bowdoin College, Brunswick, ME 04011.
*   Corresponding author; e-mail blogan{at}polar.bowdoin.edu; fax 1-207-725-3405.

Plant Physiol. (1999) 120: 821-826
Copyright Clearance Center:   0032-0889/99/120//06
© 1999 American Society of Plant Physiologists




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