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The  mtl D gene encoding mannitol-1-phosphate dehydrogenase, which catalyzes the biosynthesis of mannitol from fructose, was cloned from  Escherichia coli  and transferred to poplar ( Populus tomentosa  Carr.) through  Agrobacterium -mediated transformation. The transgenic plants were screened and selected on Murashige and Skoog (MS) medium containing 30–50 mg l −1  kanamycin and verified by polymerase chain reaction (PCR) and Southern blotting. Expression of the gene led to synthesis and accumulation of mannitol in the transgenic plants. Gas chromatography and mass spectrometry (GC/MS) and capillary gas chromatography (GC) showed that transgenic plants accumulated much more mannitol in their tissues than the wild-type plants, whether cultured in vitro, or grown hydroponically or in the field.

Overexpression of mtl D gene in transgenic Populus tomentosa improves salt tolerance through accumulation of mannitol