Use of iodoquinolines for iodine biofortification of potato plants

Recent studies on iodine biofortification of potato have documented various iodine contents in tubers: from very low to such covering the Recommended Daily Allowance (RDA-I). The aim of the work was to evaluate the efficiency of iodine biofortification of potato using six iodoquinolines applied in two doses, with KIO3 as a reference compound. The mineral status of potato plants and the nutritional and health-promoting value of tubers were also studied. Iodine enrichment of tubers ranged as followed: KIO3 (1.44-28.53 % RDA-I) > 5,7diiodo-8-quinolinol (1.53-9.80 % RDA-I) > 5-chloro-7-iodo-8-quinolinol (1.24-8.81 % RDA-I) > 8-hydroxy-7iodo-5-quinolinesulfonic acid (1.06-7.35 % RDA-I) > 4-hydroxy-7-iodoquinoline-3-carboxylic acid (0.94-6.53 % RDA-I) > 4-hydroxy-6-iodoquinoline-3-carboxylic acid (1.03-3.10 % RDA-I) > 4-hydroxy-8-iodoquinoline-3carboxylic acid (1.08-1.18 % RDA-I) versus control (0.42-0.94 % RDA-I). Higher levels were obtained for 50 than 10 mu M doses. Iodoquinolines were detected in control plants. The iodine metabolic profile (including the content of iodotyrosine, iodosalicylates and iodobenzoates) after the application of iodoquinolines was similar to that noted in the control plants.