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Earlier, a taproot\u2010specific accumulation of raffinose was shown to have beneficial effects on the freezing tolerance of the plant. However, synthesis of raffinose and other oligosaccharides of the raffinose family depends on the availability of <jats:italic>myo<\/jats:italic>\u2010inositol. Since inositol and inositol\u2010metabolising enzymes reside in different organelles, functional inositol metabolism and raffinose synthesis depend on inositol transporters. We identified five homologues of putative inositol transporters in the sugar beet genome, two of which, <jats:italic>Bv<\/jats:italic>INT1;1 and <jats:italic>Bv<\/jats:italic>INT1;2, are localised at the tonoplast. Among these, only the transcript of <jats:italic>BvINT1;1<\/jats:italic> is highly upregulated in sugar beet taproots under cold. <jats:italic>Bv<\/jats:italic>INT1;1 exhibits a high transport specificity for inositol and sugar beet mutants lacking functional <jats:italic>Bv<\/jats:italic>INT1;1 contain increased inositol levels, likely accumulating in the vacuole, and decreased raffinose contents under cold treatment. Due to the quenching capacity of raffinose for Reactive Oxygen Species (ROS), which accumulate under cold stress, <jats:italic>bvint1;1<\/jats:italic> sugar beet plants show increased expression of both, ROS marker genes and detoxifying enzymes. Based on these findings, we conclude that the vacuolar inositol transporter <jats:italic>Bv<\/jats:italic>INT1;1 is contributing to ROS\u2010homoeostasis in the cold metabolism of sugar beet.<\/jats:p>","DOI":"10.1111\/pce.15367","type":"journal-article","created":{"date-parts":[[2025,1,8]],"date-time":"2025-01-08T18:15:03Z","timestamp":1736360103000},"page":"3471-3486","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":7,"title":["The Vacuolar Inositol Transporter <i>Bv<\/i>INT1;1 Contributes to Raffinose Biosynthesis and Reactive Oxygen Species Scavenging During Cold Stress in Sugar Beet"],"prefix":"10.1111","volume":"48","author":[{"given":"Johannes","family":"Berg","sequence":"first","affiliation":[{"name":"University of Kaiserslautern Plant Physiology, Paul\u2010Ehrlich\u2010Str. 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