Generalized induction of defense responses in bean is not correlated with the induction of the hypersensitive reaction

Transcripts for phenylalanine ammonia-lyase, chalcone synthase, chalcone isomerase, and chitinase accumulated in common bean after infiltration with the Pseudomonas syringae pv tabaci Hrp- mutant Pt11528::Hrp1, even though a hypersensitive reaction did not occur. The temporal pattern of this transcr...

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Bibliographic Details
Published in:The Plant cell 1993-01, Vol.5 (1), p.49-56
Main Authors: Jakobek, J.L. (North Carolina State University, Raleigh, NC), Lindgren, P.B
Format: Article
Language:English
Subjects:
Agronomy. Soil science and plant productions
AMONIO FENILALANINA LIASA
ARN MENSAJERO
ARN MESSAGER
Bacteria
Biological and medical sciences
CHITINASE
Complementary DNA
Disease resistance
EXPRESION GENICA
EXPRESSION DES GENES
FITOALEXINA
Fundamental and applied biological sciences. Psychology
Generalities. Disease free stocks
Genes
Hypersensitive response
ISOMERASAS
ISOMERASE
Pathogens
PHASEOLUS VULGARIS
PHENYLALANINE AMMONIA LYASE
PHYTOALEXINE
Phytopathology. Animal pests. Plant and forest protection
Plant cells
Plants
PSEUDOMONAS SYRINGAE
QUITINASA
RESISTANCE AUX MALADIES
RESISTENCIA A LA ENFERMEDAD
RNA
TRANSFERASAS
TRANSFERASE
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Summary:Transcripts for phenylalanine ammonia-lyase, chalcone synthase, chalcone isomerase, and chitinase accumulated in common bean after infiltration with the Pseudomonas syringae pv tabaci Hrp- mutant Pt11528::Hrp1, even though a hypersensitive reaction did not occur. The temporal pattern of this transcript accumulation was similar to that seen after infiltration with wild-type P. s. tabaci Pt11528, which resulted in a hypersensitive reaction. Escherichia coli DH5-alpha, P. fluorescens Pf101, heat-killed Pt11528 cells, and Pt11528 cells treated with protein synthesis inhibitors also induced accumulation of defense transcripts but not a hypersensitive reaction. In contrast, these transcripts were not detected in plants infiltrated with water or P. s. pv phaseolicola NPS3121, a compatible pathogen that causes halo blight. Phytoalexins were produced in bean after infiltration with Pt11528, Pt11528::Hrp1, Pt11528 cells treated with neomycin, or Pf101, but not in plants infiltrated with NPS3121 or water. These results suggest that there are unique biochemical events associated with the expression of a hypersensitive reaction which are distinct from other plant defense responses such as phytoalexin biosynthesis. In addition, our results support the hypothesis that there is a general, nonspecific mechanism for the induction of defense transcripts and phytoalexins by pathogenic and saprophytic bacteria that is distinct from the more specific mechanism associated with the induction of the hypersensitive reaction
ISSN:1040-4651
1532-298X
DOI:10.1105/tpc.5.1.49