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Coordinate Accumulation of Antifungal Proteins and Hexoses
Constitutes a Developmentally Controlled Defense
Response during
Fruit Ripening in Grape1
Ron A. Salzman,
Irina Tikhonova,
Bruce P. Bordelon,
Paul M. Hasegawa, and
Ray A. Bressan*
Center for Plant Environmental Stress Physiology, Purdue
University, 1165 Horticulture Building, West Lafayette, Indiana
47907-1165
During ripening of grape
(Vitis labruscana L. cv Concord) berries, abundance of
several proteins increased, coordinately with hexoses, to the extent
that these became the predominant proteins in the ovary. These proteins
have been identified by N-terminal amino acid-sequence analysis and/or
function to be a thaumatin-like protein (grape osmotin), a
lipid-transfer protein, and a basic and an acidic chitinase. The basic
chitinase and grape osmotin exhibited activities against the principal
grape fungal pathogens Guignardia bidwellii and
Botrytis cinerea based on in vitro growth assays. The
growth-inhibiting activity of the antifungal proteins was substantial
at levels comparable to those that accumulate in the ripening fruit,
and these activities were enhanced by as much as 70% in the presence
of 1 M glucose, a physiological hexose concentration in
berries. The simultaneous accumulation of the antifungal proteins and
sugars during berry ripening was correlated with the characteristic
development of pathogen resistance that occurs in fruits during
ripening. Taken together, accumulation of these proteins, in
combination with sugars, appears to constitute a novel, developmentally
regulated defense mechanism against phytopathogens in the maturing
fruit.
1
This research was partially supported by a grant
from the Purdue Agricultural Research Program. This is publication no.
15,479 of the Purdue University Agricultural Experiment Station.
*
Corresponding author; e-mail bressan{at}hort.purdue.edu; fax
1-765-494-0391.
Plant Physiol. (1998) 117: 465-472
Copyright Clearance Center: 0032-0889/98/117/0465/08
© 1998 American Society of Plant Physiologists
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