Thermotolerance through isoprene emission and the novel mechanism of decrease in leaf surface temperature in plants

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Mechanism of thermotolerance by expressing isoprene synthase(IspS) in Arabidopsis thaliana has been studied, in which transgenic plants were treated at 60℃for 2. 5 hr. We compared various endogenous plant hormone contents between wild type and IspS-expressing Arabidopsis systematically, but could find significant difference. During the analysis we found that the tolerance to drastic and short time heat shock seems to be different to recovery rate of treated plants on cultivation at 23℃for a week. Considering with a recent report on the tolerance of IspS-expressing tobacco plant to ozone stress, it is suggested that the thermotolerance we observed may be due to the depletion of reactive oxygen species raised after heat shock treatment in plastids by isoprene, which actually functions as OH radical scavenger in atomosphere.