Elicitors of the salicylic acid pathway reduce incidence of bacterial canker of kiwifruit caused by Pseudomonas syringae pv. actinidae

Some strains of Pseudomonas syringae pv. actinidiae (Psa), the causal agent of bacterial canker of kiwifruit, produce plant hormones and toxins which alter the plant hormonal balance and result in the suppression of the salicylic acid (SA)‐dependent plant defences. To determine whether Psa could be...

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Bibliographic Details
Published in:Annals of applied biology 2014-11, Vol.165 (3), p.441-453
Main Authors: Cellini, A., Fiorentini, L., Buriani, G., Yu, J., Donati, I., Cornish, D.A., Novak, B., Costa, G., Vanneste, J.L., Spinelli, F.
Format: Article
Language:English
Subjects:
Acibenzolar-S-methyl
Actinidia chinensis
Actinidia deliciosa
Bacteria
Bacterial plant pathogens
Biological and medical sciences
Crop diseases
ethylene
Fundamental and applied biological sciences. Psychology
Gene expression
Phytopathology. Animal pests. Plant and forest protection
Pseudomonas syringae
resistance inducers
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Summary:Some strains of Pseudomonas syringae pv. actinidiae (Psa), the causal agent of bacterial canker of kiwifruit, produce plant hormones and toxins which alter the plant hormonal balance and result in the suppression of the salicylic acid (SA)‐dependent plant defences. To determine whether Psa could be affected by stimulation of the SA pathway, Actinidia deliciosa and A. chinensis were treated with compounds which interfere with this pathway, then inoculated with Psa. On A. deliciosa, compounds which stimulate the SA pathway [SA, or its synthetic analogue, acibenzolar‐S‐methyl (ASM)] or close stomata (ABA) resulted in disease reduction, while methyl‐jasmonate (MJA) or ethylene increased disease development. On A. chinensis, similar results were obtained except that SA and MJA did not affect disease development. Reduction in disease incidence and severity on A. deliciosa using ASM was correlated with a superoxide burst, the formation of necrotic spots and callose deposition, while on A. chinensis no superoxide burst or callose deposition was detected. Genes involved in plant–pathogen interactions were induced after treatment with ASM in A. deliciosa and, to a lesser extent, in A. chinensis. Those differences in gene expression and physiological responses after treatment with ASM are consistent with the different susceptibility to Psa observed between A. chinensis and A. deliciosa.
ISSN:0003-4746
1744-7348
DOI:10.1111/aab.12150