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Summary: Journal of Chemical Ecology, Vol. 30, No. 7, July 2004 (C 2004)
DIFFERENTIAL ACTIVITY OF PEROXIDASE ISOZYMES IN
RESPONSE TO WOUNDING, GYPSY MOTH, AND PLANT
HORMONES IN NORTHERN RED OAK (Quercus rubra L.)
STEVEN D. ALLISON1,2
and JACK C. SCHULTZ1,
1Department of Entomology
Pesticide Research Laboratory
The Pennsylvania State University
University Park, Pennsylvania 16802, USA
(Received January 28, 2003; accepted March 16, 2004)
Abstract--We measured total peroxidase activity and the activities of perox-
idase isoforms in leaves of red oak (Quercus rubra L.) seedlings exposed to
wounding and plant hormones in the greenhouse. Activity of specific peroxi-
dase isoforms was induced differentially by gypsy moth wounding, mechanical
wounding, and the wound-associated plant hormone jasmonic acid. Activity of
one isoform was enhanced modestly by treatment with salicylate. A study of
peroxidase activity in naturally occurring galls elicited on red oak leaves by
12 hymenopteran and dipteran insect species found 16 POD isoforms, 11 of
which were differentially induced or suppressed in galls compared with leaves.
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