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  • 1
    Electronic Resource
    Electronic Resource
    Electrical recording of plant penetration by western flower thrips (1996)
    Springer
    Entomologia experimentalis et applicata 79 (1996), S. 345-353 
    Details
    ISSN: 1570-7458
    Keywords: Thysanoptera ; Frankliniella occidentalis ; feeding ; electronic monitoring ; EPG ; cucumber ; chrysanthemum
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Plant penetration by western flower thrips (Frankliniella occidentalis (Pergande)) was analysed with the electrical penetration graph technique (EPG, DC-system). Thrips attached to a gold wire were included in an electrical circuit to record EPGs when penetrating the plant tissues with their stylets. Three basic EPG waveforms have been distinguished, correlated with stylet penetration into cells, salivation, and ingestion, respectively. The main difference with EPGs of Homoptera is the occurrence of continued separate penetrations that are not necessarily followed by ingestion. Insertion of the stylets causes strong voltage fluctuations in the EPG. We could confirm earlier evidence that penetration of cells and subsequent ingestion of (part of) the protoplast takes less than 20 seconds. Repeated short penetrations can be followed by a continuous feeding pattern during which the stylets are not withdrawn. The same sequence of waveforms is produced on other plant parts such as fruits or pollen grains. The specific waveforms are mainly caused by electromotive force (emf). The emf component was recorded with high resolution and the correlation of waveform details with activities of the cibarial muscle system is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00186293
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Low aromatic amino acid concentrations in leaf proteins determine resistance to Frankliniella occidentalis in four vegetable crops (1996)
    Springer
    Entomologia experimentalis et applicata 78 (1996), S. 325-333 
    Details
    ISSN: 1570-7458
    Keywords: Western flower thrips ; host plant resistance ; Capsicum annuum ; Cucumis sativus ; Lactuca sativa ; Lycopersicon esculentum ; indirect selection
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Analysis of total aromatic amino acid (free and bound) in some cucumber accessions selected previously for resistance to western flower thrips, Frankliniella occidentalis (Pergande) [Thysanoptera: Thripidae], indicated that low concentrations of these essential nutrients, relative to total leaf protein, were correlated with a reduction in damage by the insect. Further analysis of samples of four important horticultural crops (lettuce, tomato, pepper and cucumber) with unknown levels of resistance to thrips showed a significant genotypic variation in the concentrations of total aromatic amino acids relative to the total leaf protein. Accessions from each crop with low or high concentrations of aromatic amino acids in proteins were exposed to thrips larvae. Regression analysis showed a highly significant positive correlation between aromatic amino acid concentration in leaf protein and thrips damage, regardless of crop species. It is concluded that higher concentrations of aromatic amino acids in plant proteins are important for successful thrips development. These results provide plant breeders with a promising tool for indirect selection without using undesirable insect bioassays.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00193452
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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