Thermotolerance of leaf discs from four isoprene-emitting species is not enhanced by exposure to exogenous isoprene

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 tremoloides Michx.), and pussy willow (Salix discolor Muhl). Isoprene, supplied to the leaves at either 18 mu L L-1 in compressed air or 21 mu L L-1 in N-2, 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 mu mol photons m(-2) s(-1) in an N-2 atmosphere, 21 mu L 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 mu L 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.