Search Results - (Author, Cooperation:F. Ortego)

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  1. 1
    Staff View
    Publication Date:
    2011-11-25
    Publisher:
    Nature Publishing Group (NPG)
    Print ISSN:
    0028-0836
    Electronic ISSN:
    1476-4687
    Topics:
    Biology
    Chemistry and Pharmacology
    Medicine
    Natural Sciences in General
    Physics
    Keywords:
    Adaptation, Physiological/*genetics/physiology ; Animals ; Ecdysterone/analogs & derivatives/genetics ; Evolution, Molecular ; Fibroins/genetics ; Gene Expression Regulation ; Gene Transfer, Horizontal/genetics ; Genes, Homeobox/genetics ; Genome/*genetics ; Genomics ; Herbivory/*genetics/physiology ; Molecular Sequence Data ; Molting/genetics ; Multigene Family/genetics ; Nanostructures/chemistry ; Plants/parasitology ; Silk/biosynthesis/chemistry ; Tetranychidae/*genetics/*physiology ; Transcriptome/genetics
    Published by:
    http://www.nature.com/

    Latest Papers from Table of Contents or Articles in Press
  2. 2
    Staff View
    ISSN:
    0261-2194
    Keywords:
    Barley yellow dwarf virus ; PAV-serotype ; RPV-serotype ; aphid vectors ; winter barley
    Source:
    Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics:
    Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1016/0261-2194(93)90113-W

    Articles: DFG German National Licenses
  3. 3
    Ortego, F. ; Farinós, G.P. ; Ruíz, M. ; Marco, V. ; Castañera, P.
    Springer
    Published 1998
    Staff View
    ISSN:
    1570-7458
    Keywords:
    Aubeonymus ; Curculionidae ; Beta vulgaris ; sugar beet ; digestive proteases ; proteinase inhibitors
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Biology
    Notes:
    Abstract The major digestive proteinase activities of a new sugar beet pest, Aubeonymus mariaefranciscae Roudier (Coleoptera: Curculionidae), were characterized. Both larvae and adults of A. mariaefranciscae were found to use a complex proteolytic system for protein digestion based on at least trypsin-, chymotrypsin-, elastase-, cathepsin D, leucine aminopeptidase-, carboxypeptidase A- and carboxypeptidase B-like activities. An azocaseinolytic activity at pH 5.0–7.0 was identified, that was not affected by specific inhibitors and activators, making its classification in any of the mechanistic classes established not possible. According to this proteolytic profile, several serine proteinase inhibitors were tested in vitro and in vivo to establish their potential as resistance factors against A. mariaefranciscae. Larvae fed from neonate to pupation on diets containing 0.2% (w/w) soybean Bowman-Birk trypsin-chymotrypsin inhibitor, soybean Kunitz trypsin inhibitor, turkey egg white trypsin inhibitor, or lima bean trypsin inhibitor endure lower survival rates and display significant delays in the developmental time to pupation and to adult emergence. Interestingly, the most significant levels of mortality (about 90%) occurred with larvae fed on diets containing a combination of two or three inhibitors, suggesting a synergistic toxicity.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1023/A:1003425000449

    Articles: DFG German National Licenses
  4. 4
    Staff View
    ISSN:
    1570-7458
    Keywords:
    Curculionidae ; weevil ; Aubeonymus mariaefranciscae ; host plant range ; deterrent ; phagostimulant
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Biology
    Notes:
    Abstract The extent of feeding, fecundity and fertility of a new sugar beet pest, Aubeonymus mariaefranciscae Roudier (Coleoptera: Curculionidae), on a range of plants from different families was determined. We have found that the adult weevils were only able to feed and oviposit on two closely related cultivated plants, beet and sugar beet, both subspecies of Beta vulgaris L., suggesting a restricted host range for this curculionid. None of 16 secondary metabolites (widely distributed among plants, and representative of different chemical groups), nor any of 19 non-host extracts from 13 different families, deterred the adults of this curculionid from feeding on sugar beet. We found a phagostimulatory effect when beet and sugar beet homogenates from various plant tissues were supplied to adult weevils on weeds that they do not feed on. Conversely, no effect was observed when sucrose was provided. These findings suggest that host selection by A. mariaefranciscae adults is due to the presence of an undetermined phagostimulant compound(s) in beet and sugar beet, instead of the recognition of deterrent substances among the non-host plants.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1023/A:1003208319956

    Articles: DFG German National Licenses
  5. 5
    Ortego, F. ; Bowers, W. S.
    Springer
    Published 1996
    Staff View
    ISSN:
    1420-9071
    Keywords:
    Grasshopper ; Schistocerca ; ecdysone agonist ; RH-5849 ; autotomy
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Biology
    Medicine
    Notes:
    Abstract The non-steroidal ecdysone agonist RH-5849 (1,2-dibenzoyl-l-tert-butylhydrazine) was found to be an effective neurotoxicant on injection into the American bird grasshopper,Schistocerca americana (Drury). Treated grasshoppers became immediately hyperactive, followed by loss of coordination, paralysis and eventually death. We also discovered that this compound induced bilateral autotomy of the metathoracic legs during the early stages of intoxication. However, no evidence of ecdysonergic or morphogenetic activities was observed. Synergism studies with neurotoxins of known mode of action suggested that RH-5849 has a mechanism of action similar to that of 4-amino pyridine, which blocks potassium channels.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1007/BF01922414

    Articles: DFG German National Licenses
  6. 6
    Ortego, F. ; Evans, P. H. ; Bowers, W. S.
    Springer
    Published 1997
    Staff View
    ISSN:
    1573-1561
    Keywords:
    Schistocerca americana ; Orthoptera ; grasshopper regurgitate ; deterrent
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Biology
    Chemistry and Pharmacology
    Notes:
    Abstract Regurgitates of the grasshopper Schistocerca americana were deterrent to Crematogaster ants. Regurgitates obtained from insects fed upon wheat seedlings were more strongly deterrent than those obtained from insects fed on romaine lettuce leaves. After extraction of the regurgitates with ethyl acetate, deterrence could be demonstrated in both the organic and aqueous phases. Wheat seedlings, lettuce, and feces from wheat- or lettuce-fed insects yielded extracts with lower deterrency. Our results suggest that deterrents in the organic phase of the regurgitate are primarily due to the presence of plant natural products, whereas the deterrency of the aqueous phase is probably due to digestive enzymes from enteric components, probably digestive enzymes.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1023/B:JOEC.0000006481.86889.78

    Articles: DFG German National Licenses