Dissertation/Thesis Abstract

Macrophomina phaseolina and the Nature of its Relationship with Impatiens X Hybrida
by McLoughlin, Patrick Henry, Jr., M.S., Mississippi State University, 2018, 65; 10841492
Abstract (Summary)

Macrophomina phaseolina is a generalist ascomycetic fungal pathogen, capable of infecting over 500 genera of plants and limiting yield in crops grown in Mississippi. Recent documentation of M. phaseolina on Impatiens × hybrida, a newfound host, has merited multiple experiments to quantify the exact nature of this relationship. Despite M. phaseolina being a soil-borne pathogen, disease symptoms were only reported in aboveground tissue. Mode of infection experiments revealed both above and belowground tissues are susceptible to infection. In vitro experiments identified the optimal temperature for the growth of M. phaseolina to be 26°C, where more than 10x the accumulated biomass resulted compared to samples grown at 37°C. Impatiens × hybrida hosts were particularly prone to infection at temperatures above 27°C. In vitro fungicide assays revealed Banrot and T-Bird to be suitable chemical control agents for limiting M. phaseolina growth.

Indexing (document details)
Advisor: Broderick, Shaun R.
Commitee: Baird, Richard E., Denny, Geoff C., Harkess, Richard L.
School: Mississippi State University
Department: Plant and Soil Sciences
School Location: United States -- Mississippi
Source: MAI 58/01M(E), Masters Abstracts International
Subjects: Horticulture
Keywords: Biodiversity, Charcoal rot, Fungicide, Impatiens, Macrophomina phaseolina, Sunpatiens
Publication Number: 10841492
ISBN: 9780438313828
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