Journal
ENTOMOLOGIA EXPERIMENTALIS ET APPLICATA
Volume 99, Issue 1, Pages 65-70Publisher
KLUWER ACADEMIC PUBL
DOI: 10.1046/j.1570-7458.2001.00802.x
Keywords
BTH; cotton; induced resistance; pathogenesis-related; plant defense; systemic acquired resistance; whitefly
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Whether or not chemical changes in plants in response to pests (insects and pathogens) are general or specific remains unclear. Some evidence indicates that an induced response (IR) to arthropods via the octadecanoid pathway represents a distinct mechanism from the salicylic acid-based pathway of systemic acquired resistance (SAR) to pathogens. To further test this hypothesis, young cotton seedlings were activated with benzo (1,2,3) thiadiazole-7-carbothioic acid (S) methyl ester (BTH), an elicitor of SAR. The enzymatic activities of a number of pathogenesis-related (PR) proteins in young and old leaves of control and BTH treated plants were measured. BTH applications elicited marked increases in the activity levels of chitinase, peroxidase, and beta -1,3-glucanase both locally and systemically. The highest levels of induction were detected systemically in young leaves. Except for some local effects on whitefly oviposition, the induction of SAR by BTH had no effect on either host preference of whiteflies Bemisia tabaci (Gennadius) or on feeding efficiency of cotton bollworms Helicoverpa armigera (Hubner). We conclude that SAR induction via the salicylic acid pathway in 'Acala' cotton has negligible effect on the tested insect herbivores.
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