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  • 1
    Electronic Resource
    Electronic Resource
    Alkaloidal oviposition stimulants for a danaid butterfly,Ideopsis similis L., from a host plant,Tylophora tanakae (Asclepiadaceae) (1995)
    Springer
    Cellular and molecular life sciences 51 (1995), S. 753-756 
    Details
    ISSN: 1420-9071
    Keywords: Oviposition stimulants ; Ideopsis similis ; Danaidae ; Tylophora tanakae ; Asclepiadaceae ; (+)-isotylocrebrine ; (−)-7-demethyltylophorine ; alkaloids
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Chemicals releasing oviposition by an Asclepiadaceae feeder,Ideopsis similis, were identified from a host plant,Tylophora tanakae. A strong positive response was evoked by a methanolic extract of the plant, which proved to contain multiple stimulants. A mixture of two phenanthroindolizidine alkaloids, (+)-isotylocrebrine and (−)-7-demethyltylophorine, isolated from organic fractions, elicited significant ovipositional responses from females.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01941275
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  • 2
    Electronic Resource
    Electronic Resource
    Oviposition Stimulants for Sulfur ButterflyColias erate poliographys: Cyanoglucosides as Synergistis Involved in Host Preference (1997)
    Springer
    Journal of chemical ecology 23 (1997), S. 323-331 
    Details
    ISSN: 1573-1561
    Keywords: Oviposition stimulants ; Colias erate ; Lepidoptera ; Pieridae ; Trifolium repens ; Leguminosae ; cyanoglucosides ; linamarin ; lotaustralin
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Host-plant chemicals stimulating oviposition by a Leguminosae-feeding pierid butterflyColias erate poliographyswere isolated and identified from one of its primary host plants, white clover (Trifolium repens). Females readily deposited eggs in response to methanolic extracts of the plant, and subsequent partition of the extracts with organic solvents revealed that chemical constituents critical for host recognition reside in the water-soluble fraction. Further fractionation of the hydrosoluble fraction by column chromatography led to the separation of an active fraction and two cyanoglucosides, linamarin and lotaustralin. Conspicuous oviposition response was evoked by unidentified polar compound(s), while these cyanoglucosides exerted no stimulatory activity by themselves. However, ovipositing females preferred samples containing either of the two cyanoglucosides. In dual-choice bioassays, significantly more eggs were laid on samples admixed with the cyanoglucosides, suggesting that the cyanoglucosides serve as synergistic oviposition stimulants and could play an important role in host selection.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/B:JOEC.0000006362.96722.c9
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  • 3
    Electronic Resource
    Electronic Resource
    Pyrrolizidine Alkaloids Mediate Host-Plant Recognition by Ovipositing Females of an Old World Danaid Butterfly, Idea leuconoe (1997)
    Springer
    Journal of chemical ecology 23 (1997), S. 1703-1713 
    Details
    ISSN: 1573-1561
    Keywords: Oviposition stimulants ; Idea leuconoe ; Lepidoptera ; Danaidae ; Parsonsia laevigata ; Apocynaceae ; pyrrolizidine alkaloids ; parsonsianine ; parsonsianidine ; 17-methylparsonsianidine
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract A giant danaid butterfly, Idea leuconoe, specializes on apocynaceous plants such as Parsonsia laevigata, which has been reported to contain pyrrolizidine alkaloids. Females of I. leuconoe deposited eggs in response to methanolic extract of P. laevigata, and subsequent bioassay-guided fractionation of the extract revealed that phytochemicals crucial for host recognition by ovipositing females are Parsonsia-specific macrocyclic pyrrolizidine alkaloids including parsonsianine, parsonsianidine, and 17-methylparsonsianidine. Parsonine, another P. laevigata pyrrolizidine component with a keto-dihydropyrrolizine moiety that is closely related in structure to male pheromones of the butterfly, and several nonhost pyrrolizidine alkaloids were entirely inactive. We interpret these data as strong evidence for an ancestral association through herbivory between danaid butterflies and pyrrolizidine alkaloids.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/B:JOEC.0000006445.61545.82
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