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Oligogalacturonide-Mediated Induction of a Gene Involved in Jasmonic Acid Synthesis in Response to the Cell-Wall-Degrading Enzymes of the Plant Pathogen Erwinia carotovora

July 1999 , Volume 12 , Number  7
Pages  640 - 644

Cecilia Norman , 1 Sabina Vidal , 1 and E. Tapio Palva 2

1Department of Plant Biology, Uppsala Genetic Center, Swedish University of Agricultural Sciences, Box 7080, S-750 07 Uppsala, Sweden; 2Department of Biosciences, Division of Genetics, University of Helsinki, Box 56, FIN-00014, Helsinki, Finland

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Accepted 22 March 1999.

Identification of Arabidopsis thaliana genes responsive to plant cell-wall-degrading enzymes of Erwinia carotovora subsp. carotovora led to the isolation of a cDNA clone with high sequence homology to the gene for allene oxide synthase, an enzyme involved in the biosynthesis of jasmonates. Expression of the corresponding gene was induced by the extracellular enzymes from this pathogen as well as by treatment with methyl jasmonate and short oligogalacturonides (OGAs). This suggests that OGAs are involved in the induction of the jasmonate pathway during plant defense response to E. carotovora subsp. carotovora attack.

Additional keyword: elicitors.

© 1999 The American Phytopathological Society