The methylation of myo-inositol forms O-methyl inositol (D-ononitol) when plants are under abiotic stress in a reaction catalyzed by myo-inositol methyltransferase (IMT). D-Ononitol can serve as an osmoprotectant that prevents water loss in plants. We isolated the IMT cDNA from Glycine max and found by RT-PCR analysis that GmIMT transcripts are induced by drought and salinity stress treatments in the leaves of soybean seedlings. We confirmed the protein product of GmIMT and its substrate using a recombinant system in E. coli. Transgenic Arabidopsis plants over-expressing GmIMT displayed improved tolerance to dehydration stress treatment and to a lesser extent high salinity stress treatment. These results indicate that GmIMT is functional in heterologous Arabidopsis plants.
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