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United States Department of Agriculture

Agricultural Research Service

Research Project: Chemical Biology of Insect and Plant Signaling Systems

Location: Chemistry Research Unit

Title: Isolation and identificaton of novel terpenoid phytoalexins in maize

Authors
item Sims, James
item Christensen, Shawn
item Huffaker, Alisa
item Teal, Peter
item Schmelz, Eric

Submitted to: Meeting Abstract
Publication Type: Abstract Only
Publication Acceptance Date: July 17, 2013
Publication Date: N/A

Technical Abstract: Inducible chemical defense mechanisms are used by plants in response to insect attack and pathogen infection. The benzoxazinoid class of phytoanticipans is a well documented defense in Zea mays; however, some fungal pathogens and insects are capable of detoxifying these molecules. Recently, two acidic terpenoid phytoalexin families based on the carbon skeletons of ent-kaurane (1) and ß-macrocarpene (2), termed kauralexins and zealexins, respectively, were discovered in maize. Continued efforts to identify the diversity of these phytoalexin classes have led to the discovery of surprisingly complex and unstable mixtures. We report the biological interaction between kauralexin A2 (3), and the newly characterized zealexins B3 (4), A4 (5) and A6 (6) with the toxigenic fungus Aspergillus flavus.

Last Modified: 12/26/2014
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