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Titre :
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Feeding behavior of biotypes E and H greenbug (Homoptera : Aphididae) on previously infested near-isolines of barley
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Auteurs :
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D. Hays ;
D. Porter ;
J. Webster ;
B. Carver
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Type de document :
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article/chapitre/communication
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Année de publication :
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1999
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Format :
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1223-1229
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Langues:
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= Anglais
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Mots-clés:
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greenbug
;
feeding behavior
;
resistance
;
barley
;
Comportement alimentaire
;
Resistance aux depredateurs
;
Biotype
;
Actographie
;
Schizaphis graminum
;
Hordeum vulgare
;
Cereale
;
Gramineae
;
Aphididae
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Résumé :
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The feeding behavior of virulent and avirulent greenbug biotypes after preconditioning of the plant with virulent and avirulent greenbug biotypes was examined. A pair of near-isolines of barley, Hordeum vulgare L., differing by the antibiosis greenbug-resistance gene Rsg1 a were used. Rsg1 a confers resistance to all greenbug biotypes except biotypes H and J. When data from a 420-min feeding monitor period were divided into 2 periods (0-210 min and 210-420 min), differences in feeding behavior were noted during the later period. Biotype E probed 3.5-fold more frequently and fed in the phloem for 5- to 8-fold less total time when feeding on Rsg1 a+ plants than on Rsg1 a- plants or when biotype H fed on either the resistant or susceptible isoline. The feeding behavior of biotype E was not altered by preconditioning Rsg1 a+ plants with biotype H. However, when biotype H was monitored on Rsg1 a+ plants that were preconditioned for 24 h with biotype E, biotype H probed e-fold more often and spent 4-fold less time feeding in the phloem when compared with biotype H feeding on Rsg1 a+ plants that were not preconditioned. This reduction did not occur for biotype H when monitored on Rsg1 a- plants that had been preconditioned with biotype E or on Rsg1 a+ that had been preconditioned with biotype H. These results suggest that the Rsg1 a gene confers an inducible form of resistance that can be triggered by plant recognition of an avirulent greenbug biotype.
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Source :
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Journal of Economic Entomology - 0022-0493, vol. 92, n° 5
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