Journal
PLANT SIGNALING & BEHAVIOR
Volume 4, Issue 1, Pages 9-14Publisher
TAYLOR & FRANCIS INC
DOI: 10.4161/psb.4.1.7487
Keywords
Centaurea diffusa; diffuse knapweed; Asteraceae; caryophyllene oxide; linoleic acid; roots; phytotoxicity
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Funding
- U. S. Department of Defense SERDP [SI-1388]
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An extract of roots of Centaurea diffusa (diffuse knapweed) yielded caryophyllene oxide and linoleic acid which were shown to be phytotoxic. Also isolated were germacrene B, a previously-known phytotoxin as well as the inactive polyene aplotaxene. A combination of these compounds, if transferred to the soil, could be one factor in the invasive behavior of this weed. Contrary to a literature report, 8-hydroxyquinoline was not detected in root exudates of in vitro grown C. diffusa nor could it be identified in the root extract. However, a recent report from a different group maintains that 8-hydroxyquinoline can be released from roots of C. diffusa following a diurnal rhythm.
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