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A Benzothiadiazole Primes Parsley Cells for Augmented Elicitation
of Defense Responses
Vera A. Katz1,
Oliver U. Thulke1, and
Uwe Conrath*
University of Kaiserslautern, Department of Biology, P.O. Box 3049, D-67653 Kaiserslautern, Germany
Systemic acquired resistance is an
important component of the disease-resistance arsenal of plants, and is
associated with an enhanced potency for activating local defense
responses upon pathogen attack. Here we demonstrate that pretreatment
with benzothiadiazole (BTH), a synthetic activator of acquired
resistance in plants, augmented the sensitivity for low-dose
elicitation of coumarin phytoalexin secretion by cultured parsley
(Petroselinum crispum L.) cells. Enhanced coumarin
secretion was associated with potentiated activation of genes encoding
Phe ammonia-lyase (PAL). The augmentation of PAL gene induction was
proportional to the length of pretreatment with BTH, indicating
time-dependent priming of the cells. In contrast to the PAL genes,
those for anionic peroxidase were directly induced by BTH in the
absence of elicitor, thus confirming a dual role for BTH in the
activation of plant defenses. Strikingly, the ability of various
chemicals to enhance plant disease resistance correlated with their
capability to potentiate parsley PAL gene elicitation, emphasizing an
important role for defense response potentiation in acquired plant
disease resistance.
1
V.A.K. and O.U.T. are joint first authors of
this paper.
*
Corresponding author; e-mail conrath{at}rhrk.uni-kl.de; fax
49-631-205-2600.
Plant Physiol. (1998) 117: 1333-1339
Copyright Clearance Center: 0032-0889/98/117//07
© 1998 American Society of Plant Physiologists
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