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THE PLANT CELL, Vol 9, Issue 1 49-60, Copyright © 1997 by American Society of Plant Biologists
Rapid Induction by Wounding and Bacterial Infection of an S Gene Family Receptor-like Kinase Gene in Brassica oleracea
M. Pastuglia, D. Roby, C. Dumas and J. M. Cock
Reconnaissance Cellulaire et Amelioration des Plantes, UMR 9938 CNRS-INRA-ENSL, Ecole Normale Superieure de Lyon, 46 allee d'ltalie, 69364 Lyon Cedex 07, France
A receptor-like kinase, SRK, has been implicated in the autoincompatible
response that leads to the rejection of self-pollen in Brassica plants. SRK
is encoded by one member of a multigene family, the S gene family, which
includes several receptor-like kinase genes with patterns of expression
very different from that of SRK but of unknown function. Here, we report
the characterization of a novel member of the Brassica S gene family, SFR2.
RNA gel blot analysis demonstrated that SFR2 mRNA accumulated rapidly in
response both to wounding and to infiltration with either of two bacteria:
Xanthomonas campestris, a pathogen, and Escherichia coli, a saprophyte.
SFR2 mRNA also accumulated rapidly after treatment with salicylic acid, a
molecule that has been implicated in plant defense response signaling
pathways. A SFR2 promoter and reporter gene fusion was introduced into
tobacco and was shown to be induced by bacteria of another genus, Ralstonia
(Pseudomonas) solanacearum. The accumulation of SFR2 mRNA in response to
wounding and pathogen invasion is typical of a gene involved in the defense
responses of the plant. The rapidity of SFR2 mRNA accumulation is
consistent with SFR2 playing a role in the signal transduction pathway that
leads to induction of plant defense proteins, such as pathogenesis-related
proteins or enzymes of phenylpropanoid metabolism.
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