Abstract

Two fungal pathogen species, Helminthosporium solani and Pythium ultimum, cause significant economic loss to potato (Solanum tuberosum) growers throughout the world. These pathogens have substantial differences in cellular makeup, pathogenicity, and modes of infection. We studied the efficacy of 82 isolates within the bacterial genus Streptomyces in inhibiting these pathogens under laboratory and greenhouse conditions. Derivatives of Streptomyces have significant implications in medicinal use because of their antibiotic and antifungal properties. Under in-vitro conditions, 25% of Streptomyces isolates inhibited growth of P. ultimum, up to 81%. Ninety-five percent of the Streptomyces isolates inhibited growth of H. solani, with a maximum of 70%. In storage, these findings lead us to believe substantial differences between Streptomyces isolates will allow for some isolates to be effective biological controls at controlling diseases on common pathogens of potatoes.

Degree

MS

College and Department

Life Sciences

Rights

https://lib.byu.edu/about/copyright/

Date Submitted

2020-07-30

Document Type

Thesis

Handle

http://hdl.lib.byu.edu/1877/etd11813

Keywords

Helminthosporium, Pythium, biocontrol, chitinase, Streptomyces

Language

english

Included in

Life Sciences Commons

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