First published online February 24, 2002; 10.1104/pp.010744
Plant Physiol, March 2002, Vol. 128, pp. 1046-1056
Benzothiadiazole-Induced Priming for Potentiated Responses to
Pathogen Infection, Wounding, and Infiltration of Water into Leaves
Requires the NPR1/NIM1 Gene in Arabidopsis
Annegret
Kohler,1
Sandra
Schwindling,2 and
Uwe
Conrath*
Department of Biology, University of Kaiserslautern, D-67653
Kaiserslautern, Germany
Systemic acquired resistance (SAR) is a plant defense state that is
induced, for example, after previous pathogen infection or by chemicals
that mimic natural signaling compounds. SAR is associated with the
ability to induce cellular defense responses more rapidly and to a
greater degree than in noninduced plants, a process called
"priming." Arabidopsis plants were treated with the synthetic SAR
inducer benzothiadiazole (BTH) before stimulating two prominent
cellular defense responses, namely Phe AMMONIA-LYASE (PAL) gene activation and callose deposition. Although
BTH itself was essentially inactive at the immediate induction of these
two responses, the pretreatment with BTH greatly augmented the
subsequent PAL gene expression induced by
Pseudomonas syringae pv. tomato infection, wounding, or infiltrating the leaves with water. The BTH
pretreatment also enhanced the production of callose, which was induced
by wounding or infiltrating the leaves with water. It is interesting
that the potentiation by BTH pretreatment of PAL gene
activation and callose deposition was not seen in the Arabidopsis
nonexpresser of PR genes 1/noninducible immunity 1 mutant, which is compromised in SAR. In a converse manner, augmented PAL gene activation and enhanced callose biosynthesis
were found, without BTH pretreatment, in the Arabidopsis
constitutive expresser of
pathogenesis-related genes
(cpr)1 and constitutive expresser of pathogenesis-related genes 5 mutants, in
which SAR is constitutive. Moreover, priming for potentiated defense
gene activation was also found in pathogen-induced SAR. In sum, the
results suggest that priming is an important cellular mechanism in
acquired disease resistance of plants that requires the
nonexpresser of PR genes 1/noninducible immunity 1 gene.
1
Present address: Unité Mixte de Recherche
Institut National de la Recherche Agronomique-Université Henri
Poincaré Nancy, Interactions Arbres/Micro-Organismes, Institut
National de la Recherche Agronomique, Centre de Nancy, F-54280
Champenoux, France.
2
Present address: University of Saarland, Department of
Medical Biochemistry and Molecular Biology, Building 44, D-66421
Homburg, Germany.
*
Corresponding author; e-mail conrath{at}rhrk.uni-kl.de; fax
49-631-2052600.
© 2002 American Society of Plant Physiologists
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