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  • 1
    Electronic Resource
    Electronic Resource
    Light-induced variation in phenolic levels in foliage of rain-forest plants (1988)
    Springer
    Journal of chemical ecology 14 (1988), S. 23-34 
    Details
    ISSN: 1573-1561
    Keywords: Foliar phenolics ; condensed tannins ; light enhancement ; protein precipitation ; herbivory ; variable plant chemistry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract The allelochemic activity of the polyphenolics isolated from the leaves of four west African rain-forest plants,Acacia pennata, Cynometra leonensis, Diospyros thomasii, andTrema guineensis, was examined by means of protein precipitation experiments to estimate their specific activity as precipitants. Results indicated that light-induced phenol synthesis in the more heavily insolated foliage of a species led to greater protein-precipitating capacity in these leaves. It is considered doubtful that this produced a quantitative difference in protein availability to an herbivore as, on average, even in the most shaded leaves there was sufficient tannin present to precipitate all the foliar protein. However, taking into account the considerable variability inherent in the results obtained and the adaptations herbivores possess to circumvent the antinutritional properties of tannins, it was concluded that shaded foliage was generally likely to present a nutritionally more acceptable food package on a statistical basis but that acceptable leaves could be found from throughout the light continuum encountered in any of the species studied.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01022528
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Factors affecting levels of some phenolic compounds, digestibility, and nitrogen content of the mature leaves ofBarteria fistulosa (Passifloraceae) (1984)
    Springer
    Journal of chemical ecology 10 (1984), S. 387-401 
    Details
    ISSN: 1573-1561
    Keywords: Phenolics ; tannins ; condensed tannins ; fiber ; digestibility ; nitrogen content ; Barteria fistulosa ; ant-plant ; mature leaves ; chemical variation ; herbivory ; Pachysima aethiops ; Hymenotera ; Formicidae
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Levels of total phenolics, condensed tannins, acid detergent fiber, pepsin/cellulase digestibility, and nitrogen in mature leaves of 26 individuals of the ant-plant,Barteria fistulosa, have been determined. Analysis of the results in terms of the presence or absence of ants and the position of the branch from which the leaves were collected showed no relationship with concentrations of phenolics or fiber and only a weak relationship with digestibility and nitrogen. By contrast, light intensity strongly influenced levels of phenolics, notably condensed tannins, so that mature leaves of individuals growing in direct sunlight were less digestible and appeared to be of lower quality as food for herbivores than did mature leaves of individuals in shaded positions. Possible reasons for the variation in condensed tannin levels are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00988087
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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