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  • 1
    Digitale Medien
    Digitale Medien
    Hydroxamic acids affecting barley yellow dwarf virus transmission by the aphid Rhopalosiphum padi (1991)
    Springer
    Entomologia experimentalis et applicata 59 (1991), S. 79-85 
    Details
    ISSN: 1570-7458
    Schlagwort(e): Wheat ; Triticum aestivum ; cereals ; Rhopalosiphum padi ; Aphididae ; barley yellow dwarf virus ; hydroxamic acids ; DIMBOA
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract 2,4-Dihydroxy-7-methoxy-1,4-benzoxazin-3-one (DIMBOA), a hydroxamic acid (Hx) occurring in wheat, was shown to deter feeding by the aphid Rhopalosiphum padi (L.), and to reduce BYDV transmission to the plant. Dual choice tests with wheat leaves showed the preferential settlement of aphids on leaves with lower levels of DIMBOA. Electric monitoring of aphid feeding behaviour showed that in seedlings with higher DIMBOA levels fewer aphids reached the phloem and they needed longer times to contact a phloem vessel than in those with lower levels. When aphids carrying BYDV were allowed to feed on wheat cultivars with different DIMBOA levels, fewer plants were infected with BYDV in the higher DIMBOA cultivars than in the lower ones. Preliminary field experiments showed a tendency for wheat cultivars with higher Hx levels to be more tolerant to infection by BYDV than lower Hx level ones.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00187969
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  • 2
    Digitale Medien
    Digitale Medien
    Olfactometer-Assessed Responses of Aphid Rhopalosiphum padi to Wheat and Oat Volatiles (1998)
    Springer
    Journal of chemical ecology 24 (1998), S. 113-124 
    Details
    ISSN: 1573-1561
    Schlagwort(e): Odors ; semiochemicals ; green leaf volatiles ; cereals ; Hemiptera ; Aphididae
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Chemie und Pharmazie
    Notizen: Abstract Volatiles from wheat and oat seedlings elicited attraction in apterae and alatae Rhopalosiphum padi. Cereal volatiles were identified by GC-MS and olfactometric tests were performed with each compound. Attraction of aphids was elicited by (E)-2-hexenyl acetate, (Z)-3-hexenol, (E)-2-hexenyl acetate, (E)-2-hexenol, (Z)-2-hexenol, n-heptanal, n-octanal, n-nonanal, n-decanal, benzaldehyde, and linalool. The difference between the sensory capacity of alatae and apterae is discussed in relation to migrations between hosts during their life cycle.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1022393029987
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  • 3
    Digitale Medien
    Digitale Medien
    Semiochemicals Mediating Spacing Behavior of Bird Cherry-Oat Aphid, Rhopalosiphum padi Feeding on Cereals (1997)
    Springer
    Journal of chemical ecology 23 (1997), S. 2599-2607 
    Details
    ISSN: 1573-1561
    Schlagwort(e): Spacing pheromones ; olfactometry ; aphids ; wheat
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Chemie und Pharmazie
    Notizen: Abstract Olfactometry using an apterous individual of Rhopalosiphum padi (L.) showed an arresting effect by volatiles from a wheat seedling and a repellent effect by volatiles from a wheat seedling infested with aphids at a high population density (ca. 9 aphids/cm2). Four compounds, 6-methyl-5-hepten-2-one, (−)- and (+)-6-methyl-5-hepten-2-ol, and 2-tridecanone, were identified by GC-MS in air entrainments from the wheat seedlings with high aphid density but not from the wheat seedlings alone. The mixture of the four compounds in the natural proportion counteracted the attractivity of the volatiles from the intact uninfested wheat seedling. The likely role of these compounds in the spacing behavior of this aphid species, when present in high densities on wheat, is discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/B:JOEC.0000006669.34845.0d
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  • 4
    Digitale Medien
    Digitale Medien
    Effect of Dimboa, a Hydroxamic Acid from Cereals, on Peroxisomal and Mitochondrial Enzymes from Aphids: Evidence for the Presence of Peroxisomes in Aphids (1999)
    Springer
    Journal of chemical ecology 25 (1999), S. 2465-2475 
    Details
    ISSN: 1573-1561
    Schlagwort(e): Sitobion avenae ; Aphididae ; aphids ; hydroxamic acids ; DIMBOA ; catalase ; cytochrome c oxidase ; peroxisomes ; mitochondria ; xenobiotics
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Chemie und Pharmazie
    Notizen: Abstract 2,4-Dihydroxy-7-methoxy-1,4-benzoxazin-3-one (DIMBOA), a hydroxamic acid involved in the resistance of cereals to aphids, was administered to adult individuals of the aphid Sitobion avenae in artificial diets. Effects on the cellular metabolism were inferred from the evaluation of several organelle marker enzymes. Catalase from peroxisomes and cytochrome c oxidase from mitochondria increased their activities about twofold when aphids were fed with 2 mM DIMBOA. The role of these enzymes in the metabolizing of xenobiotics by aphids is discussed. Biochemical and cytochemical evidences for the presence of peroxisomes in aphids are reported here for the first time.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1020870023736
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  • 5
    Digitale Medien
    Digitale Medien
    Presence of a hydroxamic acid glucoside in wheat phloem sap, and its consequences for performance ofRhopalosiphum padi (L.) (Homoptera: Aphididae) (1994)
    Springer
    Journal of chemical ecology 20 (1994), S. 1923-1930 
    Details
    ISSN: 1573-1561
    Schlagwort(e): Hydroxamic acids ; phloem sap analysis ; aphid resistance ; cereals ; wheat ; Rhopalosiphum padi ; Homoptera ; Aphididae
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Chemie und Pharmazie
    Notizen: Abstract Phloem sap of wheat seedlings differing in whole leaf hydroxamic acid (Hx) concentrations was collected by cutting stylets of feeding aphids. DIMBOA-glucoside was the only Hx-related product found. Concentration of DIMBOA-glucoside in phloem sap showed a tendency to be negatively correlated with aphid performance.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02066233
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