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  • 1
    Electronic Resource
    Electronic Resource
    Wound-induced changes in tomato leaves and their effects on the feeding patterns of larval lepidoptera (1995)
    Springer
    Oecologia 101 (1995), S. 251-257 
    Details
    ISSN: 1432-1939
    Keywords: Wound-induced changes ; Feeding behaviour ; Spodoptera littoralis ; Tomato
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Several studies have shown changes in the patterns of damage from feeding insects associated with changes in palatability and overall consumption as a result of wound-induced chemical changes in plants. This paper describes how the pattern of feeding damage made by the larvae of Spodoptera littoralis Boisd. (Lepidoptera: Noctuidae) on tomato is affected by changes in palatability of the leaves. Two sorts of responses to leaves from plants that had received prior damage were observed. Larvae offered a choice of leaves tended to take fewer meals on leaves from previously-wounded plants than on control leaves, frequently rejecting the former after sampling them. On wounded plants this rejection behaviour was associated with a shift in feeding site towards the base of the plant. However, starved larvae offered only a single excised leaf readily ate leaves from wounded plants but took shorter meals on these leaves than on controls. Although it was not directly tested it is possible that this difference in response reflected changes in food selectivity with a differing level of satiation. The results are considered in relation to the adaptive significance of the plant of changes in within-plant distributions of herbivore damage.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00317291
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Temporal and spatial variation in palatability of soybean and cotton leaves following wounding (1989)
    Springer
    Oecologia 79 (1989), S. 520-525 
    Details
    ISSN: 1432-1939
    Keywords: Wound-induced changes ; Soybean ; Cotton ; Spodoptera littoralis ; Image analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Leaves of soybean (Glycine max (L.) Merr.) and cotton (Gossypium hirsutum L.) were mechanically damaged with a single hole and offered to Spodoptera littoralis Boisd (Lep., Noctuidae) larvae in laboratory bioassays at intervals of between 0 and 7 days from damage. The subsequent within-leaf grazing patterns of damaged and undamaged areas were compared using an image-analysing computer, and estimations were made by eye of percentage, areas grazed at three spatial scales. Reduction in palatability of damaged areas of both plant species was detected, at time intervals ranging from 0 to 7 days after damage. This effect was strongest for the longer time intervals and the effect became weaker with increasing distance from the site of damage. These results are discussed in relation to possible defensive roles of wound-induced changes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00378670
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Hydroxamic acid glucosides in honeydew of aphids feeding on wheat (1992)
    Springer
    Journal of chemical ecology 18 (1992), S. 841-846 
    Details
    ISSN: 1573-1561
    Keywords: Rhopalosiphum padi ; Homoptera ; Aphididae ; wheat ; maize ; DIMBOA ; hydroxamic acids ; aphid honeydew
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract DIMBOA glucoside (2-O-/gb-D-glucopyranosyl-4-hydroxy-7-meth-oxy-1,4-benzoxazin-3-one), the main hydroxamic acid (Hx) in intact wheat plants, was detected in the honey dew ofRhopalosiphum padi feeding on seedlings of six wheat cultivars that differed in their concentration of Hx, suggesting that the chemical circulates in the phloem. Neither the aglucone (DIMBOA) nor its main breakdown product were found in any of the honeydew samples. Honey dew production by aphids caged on seedlings of the wheat cultivars and DIMBOA glucoside concentrations in the honeydew followed biphasic curves when plotted against Hx concentration, suggesting passive ingestion of the chemical from the phloem at low Hx concentrations and limited ingestion due to feeding deterrency by Hx in mesophyll cells at high Hx concentrations. The presence of plant toxins such as Hx glucosides in the phloem sap, the main ingesta of aphids, and in the mesophyll cells, has major implications for plant defense, through a feeding deterrent effect during stylet penetration, and deterrency (antixenosis) along with antibiosis during feeding.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00988324
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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