Identification of a mannitol transporter, AgMaT1, in celery phloem |
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Authors: | Noiraud N Maurousset L Lemoine R |
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Institution: | Laboratoire de Physiologie et Biochimie Végétales, Centre National de la Recherche Scientifique Unité Mixte de Recherches 6161, 40 Avenue du Recteur Pineau, F-86022 Poitiers Cedex, France. |
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Abstract: | A celery petiole phloem cDNA library was constructed and used to identify a cDNA that gives Saccharomyces cerevisiae cells the ability to grow on mannitol and transport radiolabeled mannitol in a manner consistent with a proton symport mechanism. This cDNA was named AgMaT1 (Apium graveolens mannitol transporter 1). The expression profile in source leaves and phloem was in agreement with a role for mannitol in phloem loading in celery. The identification in eukaryotes of a mannitol transporter is important because mannitol is not only a primary photosynthetic product in species such as celery but is also considered a compatible solute and antioxidant implicated in resistance to biotic and abiotic stress. |
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