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  • Phoracantha semipunctata  (3)
  • Analytical Chemistry and Spectroscopy  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Variation amongEucalyptus species in resistance to eucalyptus longhorned borer in Southern California (1995)
    Springer
    Entomologia experimentalis et applicata 74 (1995), S. 185-194 
    Details
    ISSN: 1570-7458
    Keywords: Eucalyptus Longhorned Borer ; Phoracantha semipunctata ; Cerambycidae ; wood-boring insects ; herbivorous insects ; Eucalyptus ; plant defense ; water stress ; drought stress
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Eucalyptus L'Héritier (Myrtaceae: Leptospermoideae) species are native to the Austro-Malaysian region, but have been widely planted in temperate and subtropical regions around the world. In most regions whereEucalyptus have been imported, the Eucalyptus Longhorned Borer (Phoracantha semipunctata F.) (Coleoptera: Cerambycidae) has been accidently introduced. Larvae of the beetle bore through the bark and mine along the cambium of stressed trees, usually killing their host. We report here the relative susceptibilities of 12Eucalyptus species in two mixed-species plantations in California, USA. These trees were stressed by water deficit resulting from a prolonged drought.Eucalyptus species that appeared resistant to the borer includedE. camaldulensis Dehnhardt,E. cladocalyx F. Muller,e. sideroxylon A. Cunn. ex Woolls, andE. trabutii (anE. camaldulensis hybrid). Species that were more susceptible to attack wereE. diversicolor F. Mueller,E. globulus LaBillardière,E. grandis Hill ex Maiden,E. nitens (Deane & Maiden),E. saligna Sm., andE. viminalis LaBillardière. Survival of trees was influenced by fine-scale moisture variation resulting from slope and irrigation effects. Resistance characteristics of theseEucalyptus species did not correlate with taxonomic relatedness or bark characteristics, but did correspond to drought tolerance traits in their native habitat.Eucalyptus species that were resistant to attack byP. semipunctata were those that are most tolerant of drought in Australia.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02383010
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  • 2
    Electronic Resource
    Electronic Resource
    Mating behavior of the eucalyptus longhorned borer (Coleoptera: Cerambycidae) and the adaptive significance of long “horns” (1996)
    Springer
    Journal of insect behavior 9 (1996), S. 383-393 
    Details
    ISSN: 1572-8889
    Keywords: Cerambycidae ; Phoracantha semipunctata ; antennae ; mating behavior ; male aggression
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Sexual dimorphism in insect antennal structure is often attributed to differences between the sexes in sensitivity to pheromones, the antennae of one sex being more elaborately structured (for example, plumose). Males of the family Cerambycidae (order Coleoptera) often have longer antennae than females, but of a similar general structure, suggesting that selective factors other than sensitivity to pheromones are at work. Both sexes of the eucalyptus longhorned borer, a cerambycid, were attracted to eucalyptus logs that were larval hosts. There, males located females by antennal contact, and male mating success therefore depended on the walking rate and width of the antennal spread. Elongate antennae may benefit males by increasing antennal spread width, but have no such advantage for females, suggesting an evolutionary explanation for sexual dimorphism.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02214017
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Water relations of host trees and resistance to the phloem-boring beetle Phoracantha semipunctata F. (Coleoptera: Cerambycidae) (1999)
    Springer
    Oecologia 119 (1999), S. 400-407 
    Details
    ISSN: 1432-1939
    Keywords: Key words Drought stress ; Plant defense ; Eucalyptus ; Phoracantha semipunctata ; Wood-boring insect
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Environmental stresses, particularly water deficit, predispose eucalypt trees to attack by the eucalyptus longhorned borer, Phoracantha semipunctata F. (Coleoptera: Cerambycidae). Our experiments with potted eucalypts revealed that reduced tree water potential was associated with lower resistance to colonization by neonate P. semipunctata, but the linear relationship between water potential and colonization success was reversed at higher larval densities. There was no indication that the bark exudate “kino” served to defend trees from borer attack. Larvae were not able to colonize the cambium of eucalypt logs with high bark moisture, and survival was low under high moisture conditions in artificial hosts composed of pure cellulose. In trees and cut logs with moist bark, larvae failed to reach the cambium, feeding instead in poorer-quality tissues just beneath the bark surface. Our findings suggest that variation in resistance of eucalypts to attack by the borer is associated with moisture content of the bark.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004420050801
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  • 4
    Electronic Resource
    Electronic Resource
    Characterization of the flavin-protein interaction in L-Lactate oxidase and old yellow enzyme by resonance inverse Raman spectroscopy (1987)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 18 (1987), S. 241-245 
    Details
    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Resonance inverse Raman spectroscopy was used to examine the interactions between the flavin and surounding protein in L-lactate oxidase (from Mycobacterium smegmatis) and Old Yellow Enzyme (from brewer's bottom yeast). Spectra were taken of the enzymes both free and bound to various ligands. For L-lactate oxidase, the ligands consisted of substrate analogs (acetate, propionate) and inorganic anions (phosphate, sulfate and nitrate). For the inorganic anions, the expected attenuation with detuning was not observed for several bands which are associated with flavin rings II and III. This effect appears to be due to a disruption of ring stacking between the uracil-pyrazine end of the flavin moiety and an aromatic amino acid. A shift in the 1232 cm-1 band and changes in the bandwidths of bands in the 1450-1600 cm-1 region indicate minor reorganization of the hydrogen bonding structure around the isoalloxazine on ligand binding.For Old Yellow Enzyme, the ligand was chloride. Chloride caused a slight change to the Raman spectrum, indicative of decreased hydrogen bonding to the flavin.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jrs.1250180403
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