Enhancement of natural disease resistance in potatoes by chemicals

The mechanism involved in systemic acquired resistance (SAR) can be non-specifically induced in susceptible plants. In response to pathogens, plants' natural defence mechanisms include the production of lignin and phytoalexins and the induction of plant enzymes. The aim of this research was to...

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Bibliographic Details
Published in:Pest management science 2006-02, Vol.62 (2), p.162-170
Main Authors: Andreu, A.B, Guevara, M.G, Wolski, E.A, Daleo, G.R, Caldiz, D.O
Format: Article
Language:English
Subjects:
alpha-aminobutyric acid
Aminobutyrates - pharmacology
Aspartic Acid Endopeptidases - metabolism
Biological and medical sciences
biosynthesis
Blotting, Western
Chemicals
Control
cultivars
disease resistance
DL-3-aminobutyric acid (BABA)
Flowers & plants
fosetyl
fosetyl-aluminium
Fundamental and applied biological sciences. Psychology
fungal diseases of plants
Fungal plant pathogens
Fungicides, Industrial - pharmacology
genetic variation
Glucan 1,3-beta-Glucosidase - metabolism
leaves
mechanism of action
Organophosphorus Compounds - pharmacology
Parasitic diseases
pathogenicity
pesticide persistence
Phenol - metabolism
phytoalexins
Phytopathology. Animal pests. Plant and forest protection
Phytophthora - physiology
Phytophthora infestans
Plant Diseases - microbiology
Plant Extracts - metabolism
Plant Leaves - metabolism
plant pathogenic fungi
Plant Tubers - metabolism
Potatoes
Resistance to control
Sesquiterpenes
Solanum tuberosum
Solanum tuberosum - drug effects
Solanum tuberosum - enzymology
Solanum tuberosum - immunology
Solanum tuberosum - microbiology
systemic acquired resistance
Terpenes
tubers
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Summary:The mechanism involved in systemic acquired resistance (SAR) can be non-specifically induced in susceptible plants. In response to pathogens, plants' natural defence mechanisms include the production of lignin and phytoalexins and the induction of plant enzymes. The aim of this research was to study the induction of SAR mediated by the chemical activator DL-3-aminobutyric acid (BABA) and the fungicide fosetyl-aluminium in potato cultivars with different levels of resistance against Phytophthora infestans (Mont) de Bary. To study the chemical induction of the resistance, the foliage of several potato cultivars was sprayed with BABA, fosetyl-aluminium or water (as a control treatment). After 3 days the foliage was inoculated with P. infestans. Seven days after inoculation, development of disease symptoms in the foliage was assessed. In postharvest tuber samples, evidence for enhancement of the defence response was evaluated by measuring the protein content of several hydrolytic enzymes as well as the phenol and phytoalexin content. The highest level of protection against late blight was observed when the chemicals were applied at early stages of crop development. An increase in resistance to late blight was also detected in tubers after harvest. There was also an increase in the protein level of β-1,3-glucanase and aspartic protease as well as in the phenol and phytoalexin content of potato tuber discs obtained from postharvest tubers of treated plants. Thus the protective effect seemed to persist throughout the whole crop cycle. This treatment may offer the possibility of controlling both foliage and tuber blight and could have a major impact in reducing over-winter survival of P. infestans in tubers.
ISSN:1526-498X
1526-4998
DOI:10.1002/ps.1142