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Sulfate Uptake and Translocation in Curly Top Infected Tomatoes. N. J. Panopoulos, Assistant Research Plant Pathologist, Department of Plant Pathology, University of California, Berkeley 94720; G. Faccioli(2), and A. H. Gold(3). (2)Professor, Istituto di Patologia Vegetale dell’Universita di Bologna, Italy; (3)Professor, Department of Plant Pathology, University of California, Berkeley 94720. Phytopathology 65:77-80. Accepted for publication 30 July 1974. DOI: 10.1094/Phyto-65-77.

Sulfate uptake by curly top virus-infected whole tomato plants or their excised roots was decreased 32-61% compared to healthy plants or roots. Translocation to the aboveground parts was also decreased. The possibility that the differences in uptake were due to different root microfloras was determined to be unlikely. Decreased uptake was found over the concentration range from 10–6 M to 8 × 10–3 M. The uptake isotherms were typically multiphasic in both healthy and diseased plant roots, and the number of phases was similar in both. Leakage of sulfate from the roots was also unaffected by infection. These and earlier results support the conclusion that curly top virus infection altered differential membrane permeability.

Additional keywords: Lycopersicum esculentum, differential permeability.