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  • 2000-2004
  • 1995-1999  (2)
  • 1905-1909
  • 1996  (2)
  • allozyme variation  (1)
  • host plant resistance  (1)
Material
Years
  • 2000-2004
  • 1995-1999  (2)
  • 1905-1909
Year
  • 1996  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Entomologia experimentalis et applicata 78 (1996), S. 121-127 
    ISSN: 1570-7458
    Keywords: Brevicoryne brassicae ; cellulose acetate ; electrophoresis ; allozyme variation ; population structure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Allozymes from individual aphids were used as markers to examine the structure of Brevicoryne brassicae colonies collected from field experiments at Horticulture Research International, Wellesbourne, during the summers of 1991, 1992 and 1993. Eighteen enzyme systems were examined using cellulose acetate electrophoresis, but only 6-phosphogluconate dehydrogenase (6-PGDH) showed polymorphism (three alleles) in the samples. There were significant differences in gene frequencies between populations at some sites within 1 kilometre and between times of sampling, with an increase in the proportion of the most common genotype AA later in the season, possibly due to selection during the summer of the best adapted clones. These changes in gene frequency might produce biased results in trials screening brassica crops against aphids.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Entomologia experimentalis et applicata 78 (1996), S. 325-333 
    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
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