| Autor: |
Koricheva, Julia, Nykänen, Heli, Gianoli, Ernesto |
| Předmět: |
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| Zdroj: |
American Naturalist; Apr2004, Vol. 163 Issue 4, pE64-E75, 12p |
| Abstrakt: |
On the basis of physiological and ecological costs of defense allocation, most plant defense theories predict the occurrence of trade-offs between resource investment in different types of anti- herbivore defenses. To test this prediction, we conducted a meta- analysis of 31 studies published in 1976-2002 that provided data on covariation of different defensive traits in plant genotypes. We found no overall negative association between different defensive traits in plants; instead, the relationship between defensive traits varied from positive to negative depending on the types of co-occurring defenses. Evidence of trade-off was found only between constitutive and induced defenses. Therefore, to a large extent, plants appear to be jacks- of-all-trades, masters of all and may successfully produce several types of defense without paying considerable trade-offs. Our survey thus provides little evidence that genetic trade-offs between defensive traits significantly constrain the evolution of multiple defenses in plants. |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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