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Physiology and Biochemistry

Altered Pattern of Root Formation on Cuttings of Gynura aurantiaca Infected by Citrus Exocortis Viroid. Ricardo Flores, Instituto de Agroquímica y Tecnología de Alimentos (C.S.I.C.) Jaime Roig 11, Valencia 10, Spain; José-Luis Rodríguez, Departamento de Bioquímica, Facultad de Ciencias Biológicas, Burjasot, Valencia, Spain. Phytopathology 71:964-966. Accepted for publication 6 February 1981. Copyright 1981 The American Phytopathological Society. DOI: 10.1094/Phyto-71-964.

The ability of cuttings from healthy and citrus exocortis viroid (CEV)-infected Gynura aurantiaca plants to form roots was investigated. Roots began to develop 8–10 days and 18–32 days after excision on healthy and CEV-infected cuttings, respectively. It also was observed that the root system of healthy cuttings was composed of a larger number of roots than that of CEV-infected ones. The impaired ability of CEV-infected cuttings to form roots could be related to small amounts of an auxinlike substance(s) with an Rr similar to indoleacetic acid that was found to diffuse from apical buds of CEV-infected G. aurantiaca.