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Cytology and Histology

Histopathology of Mixed Infections by Colletotrichum truncatum and Phomopsis spp. or Cercospora sojina in Soybean Seeds. Indra K. Kunwar, Visiting research associate, Department of Plant Pathology, University of Illinois at Urbana-Champaign, 1102 S. Goodwin Avenue, Urbana 61801; Tribhuwan Singh(2), and J. B. Sinclair(3). (2)(3)Former visiting assistant professor of botany, and professor, respectively, Department of Plant Pathology, University of Illinois at Urbana-Champaign, 1102 S. Goodwin Avenue, Urbana 61801, (2)Present address: Department of Botany, University of Rajasthan, Jaipur, India 302004. Phytopathology 75:489-492. Accepted for publication 6 November 1984. Copyright 1985 The American Phytopathological Society. DOI: 10.1094/Phyto-75-489.

Histopathologic examinations of mixed infections of Colletotrichum truncatum and either Phomopsis spp. or Cercospora sojina in field-grown seeds of soybean (Glycine max) were made by using bright-field microscopy. Phomopsis spp. colonized seed coat and embryo tissues, and C. sojina and C. truncatum were confined to seed coat tissues. Phomopsis spp. was restricted in its colonization of seed coat tissues when C. truncatum was present. There was an additive effect on deterioration of seed coat tissues when both C. truncatum and Phomopsis spp. were present.