caa a22 4500 397570449 CHVBK 20180308164839.0 cr unu---uuuuu 161202e19961201xx s 000 0 eng 10.1093/ee/25.6.1344 doi (NATIONALLICENCE)oxford-10.1093/ee/25.6.1344 Glucosinolates and Herbivory by Specialists (Coleoptera: Chrysomelidae, Lepidoptera: Plutellidae): Consequences of Concentration and Induced Resistance [Elektronische Daten] [David H. Siemens, Thomas Mitchell-Olds] Varied responses by specialist herbivores to glucosinolates could be a function of glucosinolate concentration or other correlated resistance factors, Herbivory by the specialist flea beetle Phyllotreta cruciferae (Goeze), and diamondback moth, Plutella xylostella (L.), varied curvilinearly with natural levels of glucosinolates in Brassica rapa (syn.campestris) (L.) such that maximum herbivory occurred at intermediate glucosinolate levels, Although the pattern was weak, decreases in herbivory at high concentrations of glucosinolates were enhanced by inoculating plants with the fungal pathogen Leptosphaeria maculans(Desm.) Ces. et de Not.(Ascomycetes), in laboratory experiments. This enhancement effect may have been caused by other correlated induced resistance factors produced by the plant or by resistance factors produced by the pathogen (independent of the host plant), Although specialist herbivores of mustards may have overcome glucosinolates, the apparent dose-dependent effect of glucosinolates suggest this herbivore counteradaptation may not have been complete, perhaps because of correlated resistance factors. Because a component of glucosinolate variation in B. rapa is heritable and because P. cruciferae can negatively affect plant fitness, the vried responses of specialist herbivores with glucosinolate concentrations reported here further suggest the possibility of disruptive selection on glucosinolates. © 1996 Entomological Society of America Population Ecology nationallicence Brassica rapa nationallicence Phyllotreta cruciferae nationallicence Plutella xylostella nationallicence Glucosinolates nationallicence herbivores nationallicence induction nationallicence Siemens David H. Division of Biological Sciences, University of Montana, Missoula, MT 59812 aut Mitchell-Olds Thomas aut Environmental Entomology Oxford University Press 25/6(1996-12-01), 1344-1353 0046-225X 25:6<1344 1996 25 ee https://doi.org/10.1093/ee/25.6.1344 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1093/ee/25.6.1344 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Siemens David H. Division of Biological Sciences, University of Montana, Missoula, MT 59812 aut NATIONALLICENCE 700 1- Mitchell-Olds Thomas aut NATIONALLICENCE 773 0- Environmental Entomology Oxford University Press 25/6(1996-12-01), 1344-1353 0046-225X 25:6<1344 1996 25 ee Metadata rights reserved CC BY-NC-4.0 http://creativecommons.org/licenses/by-nc/4.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-oxford