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Title:The Histology and Histochemistry of The Wound-Healing Process in Geranium Cuttings in Relationship to Basal Stem Rot Caused by Pythium Ultimum
Author(s):Cline, Molly Niedbalski
Department / Program:Plant Pathology
Discipline:Plant Pathology
Degree Granting Institution:University of Illinois at Urbana-Champaign
Subject(s):Agriculture, Plant Pathology
Abstract:Geraniums are largely propagated by cuttings even though new seed strains are now becoming popular. They are available as unrooted, callused redi-root (adventitious root initials just beginning to emerge) or fully rooted cuttings. Blackleg, caused by Pythium species, is a problem in geranium propagation. Cuttings of Pelargonium hortorum 'Yours Truly' were inoculated with an isolate of Pythium ultimum. Extensive basal stem rot occurred on all freshly broken cuttings. A restricted basal stem rot occurred on cuttings that had healed 1 day in soil prior to inoculation. Basal stem rot rarely occurred on cuttings that had healed 2 days or longer prior to inoculation. The wound-healing process in cuttings was studied using histological and histochemical techniques. After 1 day a distinct morphological change occurred in the cell walls of all tissues nearest the wounded surface. The cell walls became thickened due to deposition of substance in a layer around the cell wall. Histochemical tests determined this substance to be suberin. Suberin deposits were also observed in the intercellular spaces. A wound callus developed after 7-10 days. A suberized wound periderm developed after 14-21 days. Disease severity and the length of time after wound healing began were inversely correlated.
Issue Date:1980
Description:127 p.
Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1980.
Other Identifier(s):(UMI)AAI8108470
Date Available in IDEALS:2014-12-14
Date Deposited:1980

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