Journal
PLANT SPECIES BIOLOGY
Volume 32, Issue 2, Pages 147-155Publisher
WILEY
DOI: 10.1111/1442-1984.12136
Keywords
elemental defense; Ferriferous Quadrangle; insect-plant interactions; rupestrian fields; ultramafic soils
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Funding
- Forest State Institute (IEF)
- Itacolomi State Park
- Uaimii State Forest and Ouro Branco Mountain
- National Counsel of Technological and Scientific Development (CNPq)
- Department of Research and Graduate Studies at the Federal University of Ouro Preto (PROPP/UFOP)
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Species that evolved in high-altitude grasslands, where soils are dystrophic and metal rich, developed adaptations for these extreme conditions, such as metal accumulation and sclerophyllous leaves, and these adaptations may secondarily affect insect herbivory activity. The present study investigates the hypothesis that costs related to accumulation of certain metals may be evolutionarily compensated for by decreasing leaf herbivory in some plant species from rupestrian fields. Studies were conducted in different locations at the Ferriferous Quadrangle, a metal-rich region in south-east Brazil, with four species adapted to high-altitude grasslands: Eremanthus erythropappus, Eremanthus incanus, Lychnophora ericoides and Byrsonima variabilis. Sample design varied according to population sizes and spatial distribution of individuals. We found that concentrations of manganese (Mn) and iron (Fe) significantly reduced the herbivory in the leaves of E. erythroppapus and E. incanus, whereas aluminum (Al) reduced herbivory in L. ericoides, and Mn affected negatively the herbivory in B. variabilis. These results support the hypothesis that metal-accumulating plants, as a response to the harsh environment in which they evolved, are protected against foliar damage caused by insect herbivores in rupestrian fields.
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