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Induction of hydroxycinnamoyl-tyramine conjugates in pepper by Xanthomonas campestris, a plant defense response activated by hrp gene-dependent and hrp gene-independent mechanisms.
- Source :
-
Molecular plant-microbe interactions : MPMI [Mol Plant Microbe Interact] 2001 Jun; Vol. 14 (6), pp. 785-92. - Publication Year :
- 2001
-
Abstract
- Inoculation of pepper leaves, Capsicum annuum cv. Early Calwonder ECW 10R, with strains of Xanthomonas campestris led to an accumulation of the phenolic conjugates feruloyltyramine (FT) and p-coumaroyltyramine (CT) 24 h postinoculation in nonhost- and gene-for-gene-determined incompatible interactions with X. campestris pv. campestris and X. campestris pv. vesicatoria, respectively. In contrast, neither compound was detected in compatible interactions with X. campestris pv. vesicatoria. The accumulation of FT and CT was preceded by an increase in the extractable activity of tyrosine decarboxylase as well as increases in the transcription of genes encoding phenylalanine ammonia-lyase and tyramine hydroxycinnamoyl transferase. No such changes were detected in compatible interactions. Very rapid accumulation of FT and CT occurred (4 h postinoculation) in pepper in response to a X. campestris pv. campestris mutant carrying a deletion of the hrp gene cluster. In contrast, hrp mutants of X. campestris pv. vesicatoria failed to elicit the production of FT and CT. These observations suggest the existence of hrp gene-dependent and -independent activation mechanisms of a defense response involving hydroxycinnamoyltyramines.
- Subjects :
- Anti-Bacterial Agents pharmacology
Capsicum metabolism
Coumaric Acids pharmacology
Fungal Proteins physiology
Genes, Fungal
Multigene Family
Phenols metabolism
Plant Diseases genetics
Plant Proteins genetics
Plant Proteins metabolism
Tyramine analogs & derivatives
Tyramine pharmacology
Tyrosine Decarboxylase metabolism
Xanthomonas campestris drug effects
Xanthomonas campestris genetics
Capsicum microbiology
Coumaric Acids metabolism
Fungal Proteins genetics
Plants, Medicinal
Tyramine biosynthesis
Xanthomonas campestris physiology
Subjects
Details
- Language :
- English
- ISSN :
- 0894-0282
- Volume :
- 14
- Issue :
- 6
- Database :
- MEDLINE
- Journal :
- Molecular plant-microbe interactions : MPMI
- Publication Type :
- Academic Journal
- Accession number :
- 11386374
- Full Text :
- https://doi.org/10.1094/MPMI.2001.14.6.785