| Full text | |
| Author(s): |
Total Authors: 2
|
| Affiliation: | [1] Univ Sao Paulo, Inst Biociencias, Dept Ecol, Sao Paulo - Brazil
[2] Univ Estadual Campinas, Inst Biol, Dept Biol Anim, Campinas, SP - Brazil
Total Affiliations: 2
|
| Document type: | Journal article |
| Source: | Neotropical Entomology; v. 45, n. 3, p. 252-257, JUN 2016. |
| Web of Science Citations: | 4 |
| Abstract | |
Plant secondary metabolites can have opposing effects on adapted specialist and non-adapted, generalist herbivores. In this study, we used Heliothis virescens (Fabricius) (Lepidoptera: Noctuidae) as a generalist, non-adapted model herbivore to test the possible effects of Crotalaria pallida (Fabaceae: Papilionoideae) defenses on herbivore performance. Neonate H. virescens larvae were able to consume C. pallida leaves and fruits and grow for a few instars, but none of them survived to pupation. We added isolated pyrrolizidine alkaloids (PAs) to an artificial diet at different concentrations, and PA concentration significantly affected the number of larvae that achieved pupation. Larval survival was not reduced at a PA concentration similar to the concentration on green seeds of C. pallida, but it was significantly reduced at PA concentration 5 and 100 times higher. These results suggest that PAs in isolation are not the defense responsible for the mortality in fresh C. pallida plants, indicating the importance of other possible defenses. The negative effect of PAs on fitness of the non-adapted, generalist herbivore is in agreement with few previous studies, but it is in clear contrast to a previous study on the effects of PAs on the adapted specialist herbivore Utetheisa ornatrix (L.) that were able to sequester PAs with no fitness costs. (AU) | |
| FAPESP's process: | 11/17708-0 - Chemical defense in plants and insects in neotropical environments |
| Grantee: | Jose Roberto Trigo |
| Support Opportunities: | Regular Research Grants |