Failure of tannic acid to inhibit digestion or reduce digestibility of plant protein in gut fluids of insect herbivores - Implications for theories of plant defense
Journal of Chemical Ecology, ISSN: 0098-0331, Vol: 13, Issue: 3, Page: 605-621
1987
- 109Citations
- 50Captures
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Metrics Details
- Citations109
- Citation Indexes108
- 108
- CrossRef94
- Policy Citations1
- 1
- Captures50
- Readers50
- 50
Article Description
The rate of hydrolysis of the abundant foliar protein, ribulose-1,5-bisphosphate carboxylase/oxygenase (RuBPC), in enzymatically active gut fluid of Manduca sexta larvae is very rapid and is unaffected by the presence of tannic acid, even when tannic acid is present in the incubation mixture in amounts in excess of the amount of RuBPC. When this protein is dissolved in the denatured gut fluids of M. sexta larvae or Schistocerca gregaria nymphs, large amounts of tannic acid must be added to bring about the precipitation of significant quantities of protein. The ability of insect gut fluid to prevent the formation of insoluble tannin-protein complexes is due to the presence of surfactants. On the basis of our results and a review of the findings of other investigators, we argue that there is no evidence that tannins reduce the nutritional value of an insect's food by inhibiting digestive enzymes or by reducing the digestibility of ingested proteins and, further, that the failure of tannins to interfere with digestion is readily explained on the basis of well-documented characteristics of the digestive systems of herbivorous insects. In challenging the currently popular notion that tannins are digestibility-reducing substances, we do not challenge the general utility of either the apparency theory or resource availability theory of plant defense. In debating the merits of these two analyses of plant-herbivore interactions, however, the demise of tannins as all-purpose, dose-dependent, digestibility-reducing defensive substances must be taken into account. © 1987 Plenum Publishing Corporation.
Bibliographic Details
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=0001792678&origin=inward; http://dx.doi.org/10.1007/bf01880103; http://www.ncbi.nlm.nih.gov/pubmed/24301898; http://link.springer.com/10.1007/BF01880103; http://www.springerlink.com/index/pdf/10.1007/BF01880103; http://www.springerlink.com/index/10.1007/BF01880103; https://dx.doi.org/10.1007/bf01880103; https://link.springer.com/article/10.1007/BF01880103
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