Does salicylic acid act as a signal in cotton for induced resistance to Helicoverpa zea?

Our previous study indicated that insect herbivory on cotton induced resistance to the cotton bollworm (Helicoverpa zea). Here we examine the role of salicylic acid as a signal in cotton for the induced resistance. Abundant evidence has accumulated showing that salicylic acid plays a key role in coo...

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Bibliographic Details
Published in:Journal of chemical ecology 1997-07, Vol.23 (7), p.1805-1818
Main Authors: Bi, J.L. (University of Arkansas, Fayetteville.), Murphy, J.B, Felton, G.W
Format: Article
Language:English
Subjects:
ACIDE ASCORBIQUE
ACIDE SALICYLIQUE
ACIDO ASCORBICO
ACIDO SALICILICO
Agronomy. Soil science and plant productions
ASCORBIC ACID
Biological and medical sciences
CATALASA
CATALASE
CONTROL DE INSECTOS
Cotton
Fundamental and applied biological sciences. Psychology
Genetics and breeding of economic plants
GOSSYPIUM HIRSUTUM
HELICOVERPA ZEA
HERBIVORE
HERBIVORES
HERBIVOROS
Herbivory
HYDROGEN PEROXIDE
INDUCED RESISTANCE
INSECT CONTROL
LUTTE ANTIINSECTE
PEROXIDASAS
PEROXIDASES
PEROXIDO DE HIDROGENO
PEROXYDASE
PEROXYDE D'HYDROGENE
Pest animals
PEST RESISTANCE
RESISTANCE AUX ORGANISMES NUISIBLES
RESISTANCE INDUITE
RESISTENCIA A LAS PLAGAS
RESISTENCIA INDUCIDA
SALICYLIC ACIDS
Skin
SYSTEMIC ACQUIRED RESISTANCE
Varietal selection. Specialized plant breeding, plant breeding aims
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Summary:Our previous study indicated that insect herbivory on cotton induced resistance to the cotton bollworm (Helicoverpa zea). Here we examine the role of salicylic acid as a signal in cotton for the induced resistance. Abundant evidence has accumulated showing that salicylic acid plays a key role in coordinating the expression of systemic acquired resistance against phytopathogens. We report that herbivory results in significant increases in foliar salicylic acid and H2O2, a response frequently observed following pathogenesis. In other well-studied systems (e.g., tobacco), salicylic acid inhibits the enzymatic decomposition of H2O2 by catalase and ascorbate peroxidase, but in cotton, salicylic acid has no effect on these enzymes in vitro. Furthermore, while herbivory enhances foliar catalase and ascorbate peroxidase activities, the application of salicylic acid or methyl salicylate to cotton plants does not affect foliar resistance to H. zea. The possible role of salicylic acid as a signal for induced resistance is discussed in light of these findings
ISSN:0098-0331
1573-1561
DOI:10.1023/b:joec.0000006452.81324.b8