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  • 1
    ISSN: 1420-9098
    Keywords: Apis mellifera ; queen pheromone ; queen rearing ; monogyny ; Africanized
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Queen rearing is suppressed in honey bees (Apis mellifera L.) by pheromones, particularly the queen's mandibular gland pheromone. In this study we compared this pheromonally-based inhibition between temperate and tropically-evolved honey bees. Colonies of European and Africanized bees were exposed to synthetic queen mandibular gland pheromone (QMP) for ten days following removal of resident queens, and their queen rearing responses were examined. Queen rearing was suppressed similarly in both European and Africanized honey bees with the addition of synthetic QMP, indicating that QMP acts on workers of both races in a comparable fashion. QMP completely suppressed queen cell production for two days, but by day six, cells containing queen larvae were present in all treated colonies, indicating that other signals play a role in the suppression of queen rearing. In queenless control colonies not treated with QMP, Africanized bees reared 30% fewer queens than Europeans, possibly due to racial differences in response to feedback from developing queens and/or their cells. Queen development rate was faster in Africanized colonies, or they selected older larvae to initiate cells, as only 1 % of queen cells were unsealed after 10 days compared with 12% unsealed cells in European colonies.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Theoretical and applied genetics 99 (1999), S. 192-198 
    ISSN: 1432-2242
    Keywords: Key words PCR markers ; Sequence-tagged-site ; Wheat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  PCR products from regions corresponding to sequences hybridising to wheat RFLP probes were sequenced in order to establish the level of DNA sequence variation among adapted wheat genotypes. Hexaploid bread wheat shows a very low rate of nucleotide polymorphism, approximately 1 polymorphic nucleotide per 1000 basepairs. Differences in PCR product length can be exploited to design genome-specific amplicons, which may have use in gene tagging or in diagnostic applications. Interpretation of results may be complicated by the simultaneous amplification of orthologous and paralogous sequences. These findings have significant implications for the use of STS markers in wheat and other polyploid species.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Theoretical and applied genetics 90 (1995), S. 247-252 
    ISSN: 1432-2242
    Keywords: Wheat ; Microsatellite markers
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract In eukaryotes, tandem arrays of simple-sequence repeat sequences can find applications as highly variable and multi-allelic PCR-based genetic markers. In hexaploid bread wheat, a large-genome inbreeding species with low levels of RFLP, di- and trinucleotide tandem repeats were found in 22 published gene sequences, two of which were converted to PCR-based markers. These were shown to be genome-specific and displayed high levels of variation. These characteristics make them especially suitable for intervarietal breeding applications.
    Type of Medium: Electronic Resource
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