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Some Effects of Metabolic Changes Induced in Etrog Citron by Three Isolates of Exocortis Virus. S. P. Kapur, Department of Plant Pathology, University of California, Riverside 92502; D. J. Gumpf(2), and L. G. Weathers(3). (2)(3)Department of Plant Pathology, University of California, Riverside 92502. Phytopathology 64:196-201. Accepted for publication 10 August 1973. DOI: 10.1094/Phyto-64-196.

Results of metabolic changes in ‘Etrog’ citron plant infected with three different isolates of exocortis virus were examined. A positive correlation was found between symptom severity, oxygen uptake, and respiration. An inverse relationship was observed between symptom severity and total nitrogen in citron leaves. Marked changes in several free amino acids were noted with all three isolates. Changes were observed in alanine, arginine, aspartic acid, glutamic acid, glycine, and proline. Plants chronically infected with the severe isolate of exocortis showed an increase in total and reducing sugars. Peroxidase activity in the infected plants was at a higher level than noninoculated controls. Catalase activity increased only with the severe and moderate isolates. No differing nucleic acid species were observed in extracts from infected leaves.