Title

Light-activated phytotoxic thiophenes in Flaveria linearis L.

Document Type

Thesis

Degree

Master of Science (MS)

Department

Biology

First Advisor's Name

Kelsey R. Downum

First Advisor's Committee Title

Committee Chair

Second Advisor's Name

Jennifer H. Richards

Third Advisor's Name

David W. Lee

Keywords

Acetylene compounds, Plant metabolites, Phytotoxins, Botanical chemistry

Date of Defense

5-29-1990

Abstract

Chromatographic analyses of crude leaf extracts of Flaveria linearis L. revealed the presence of four acetylenic monothiophenes. Three of these metabolites were purified and structurally characterized by UV, NMR, IR, and GC-MS. Germination, growth, and survival/mortality studies with and without UVA, the activating wavelengths of these metabolites, were conducted with the crude leaf extracts and the purified compounds (taken individually and combined) against selected crop species (lettuce, radish, and carrot).

Results suggest that acetylenic metabolites are phytotoxic against lettuce, carrot, and radish, but with variability in response among species. These variations in sensitivity and the allelopathic potential of F. linearis is discussed.

Identifier

FI14051875

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