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Nuclear Orientation in Onion Epidermal Cells in Relation to Wounding and Infection. A. J. Pappelis, Professor, Department of Botany, Southern Illinois University, Carbondale 62901; G. A. Pappelis(2), and F. B. Kulfinski(3). (2)Presidentís Scholar, Southern Illinois University, Carbondale 62901; (3)Associate Professor, Department of Biological Sciences, Southern Illinois University, Edwardsville 62025. Phytopathology 64:1010-1012. Accepted for publication 22 February 1974. DOI: 10.1094/Phyto-64-1010.

Nuclei of onion bulb scale inner epidermal cells moved toward wounds or penetration sites of Botrytis allii or Aspergillus niger, the orientation effect being appreciably greater with infection. Nuclei 2 cm or more from these influences were oriented as those in untreated tissue.

Additional keywords: Allium cepa, Botrytis allii, Aspergillus niger, cell killing, nuclear movement.