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Comparative Anatomy of Healthy and Exocortis Virus-Infected Citron Plants. Abd El-Shafy A. Fudl-Allah, Postdoctoral Fellow, Department of Plant Pathology, University of California, Riverside 92502; E. C. Calavan(2), and P. R. Desjardins(3). (2)(3)Professors of Plant Pathology, Department of Plant Pathology, University of California, Riverside 92502. Phytopathology 61:990-993. Accepted for publication 18 March 1971. DOI: 10.1094/Phyto-61-990.

Specimens from healthy and exocortis virus-infected citron, Citrus medica, plants were sectioned and studied before and after fixation. The following anatomical characteristics of the disease in citron leaves were observed: (i) abnormal darkening of contents of parenchyma cells; (ii) hypertrophy and hyperplasia; (iii) granulation of cell contents; (iv) death of cells; and (v) cracking and sloughing of necrotic tissue. All these reactions occurred in the cortical tissue on the underside of the midrib of exocortis virus-infected leaves. Some hypertrophy and necrosis were observed in the phloem.