ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Analysis of wheat resistance to the cereal aphidSitobion avenae using electrical penetration graphs and flow charts combined with correspondence analysis (1995)
    Springer
    Entomologia experimentalis et applicata 75 (1995), S. 9-18 
    Details
    ISSN: 1570-7458
    Keywords: Homoptera ; Sitobion avenae ; Triticum monococcum ; resistance mechanisms ; probing behaviour ; electronic monitoring ; flow charts ; correspondence analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The behaviour ofSitobion avenae (F.), was compared on resistant wheat lines ofTriticum monococcum (L.) and a susceptible variety ofTriticum aestivum (L.). Firstly, stylet penetration activities were monitored with the Electrical Penetration Graph (EPG) technique and subsequently analysed using flow charts combined with correspondence analysis. Plant resistance was shown to be associated with repeated penetrations without access to either the xylem or the phloem, and with numerous failures in starting a sustained sap ingestion (as represented by pattern E2). Access to sieve elements of the phloem did not seem to be much affected on resistant plants but it took the aphid three times as long to produce a sap ingestion pattern when maintained on the resistant lineT. monococcum no 44 (Tm44) as compared with aphids maintained on susceptible plants. As a result the total time spent in ingesting from sieve elements was reduced by 72% on Tm44. Secondly, direct observations of freely-moving apterous adults were performed. Aphids did not discriminate between resistant and susceptible wheat during the first 30 min of access to test leaves, but only 4 out of 25 aphids were still probing after eight hours on resistant Tm44. The relevance of these results to possible location of the resistance factor(s) are discussed. Although detection of plant resistance before sieve elements are reached can not be rigorously excluded, the factors involved inT. monococcum resistance toS. avenae undoubtedly occur within the phloem vessels.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02382774
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Analysis of oviposition behaviour in the parasitoidEpidinocarsis lopezi (Hym.: Encyrtidae): Comparison of flow charts on factorial maps (1993)
    Springer
    BioControl 38 (1993), S. 207-218 
    Details
    ISSN: 1573-8248
    Keywords: host discrimination ; correspondence analysis ; superparasitism
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Description / Table of Contents: Résumé Des cemelles d'Epidinocarsis lopezi sont confrontées à des lots de cochenilles-hôtes non parasitées ou contenant une proportion variable d'individus parasités. Les séquences de ponte obtenues dans les différentes situations sont filmées et découpées en unités de comportement ou item. L'analyse de la succession de ces unités permet la construction de diagrammes de flux sur plans factoriels caractéristiques de chaque type de séquence. La comparaison de ces diagrammes met en évidence la capacité discriminatoire des femelles parasitoïdes car l'importance relative des item est modifiée par le taux d'hôtes parasités rencontrés; elle donne aussi des indications sur les motivations d'une femelle lors de l'exploitation d'une placette (patch). De plus, l'analyse découpe la séquence de ponte en item liés à la recherche de l'hôte, item liés à la ponte proprement dite et item intervenant après la piqûre. Ces trois séries d'unités comportementales sont associées aux axes factoriels qui illustrent donc les tendances fondamentales du comportement de ponte.
    Notes: Abstract Females ofEpidinocarsis lopezi (De Santis) are presented with groups of unparasitized hosts or groups containing different ratios of parasitized hosts (Phenacoccus manihoti). Oviposition behaviour sequences obtained in various situations are filmed and split into units of behaviour or patterns. The succession of patterns is analyzed and translated into flow charts on factorial maps characteristic of each type of sequence. Comparison of flow charts reveals host discrimination by female parasitoids since the relative importance of behaviour patterns is modified according to the level of parasitized hosts encountered; it also gives clues to the strategy adopted by the female parasitoid during the search of a patch. In addition, the analysis divides the oviposition sequence into three separate patterns, specific to host search, oviposition act and post-oviposition behaviour. This series of patterns is closely related to factorial axes which indicates the fundamental trends of oviposition behaviour.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02372555
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...