| production of induced volatiles by datura wrightii in response to damage by insects: effect of herbivore species and time. | natural enemies of herbivorous insects utilize numerous chemical cues to locate and identify their prey. among these, volatile plant compounds produced after attack by herbivores may play a significant role (hereafter herbivore-induced plant volatiles or hipvs). one unresolved question is whether the composition of the volatile cue blends induced by different herbivore species differ consistently enough to indicate not only that the plants are damaged by herbivores but also the identity of the h ... | 2011 | 21691808 |
| biological activity of acyl glucose esters from datura wrightii glandular trichomes against three native insect herbivores. | datura wrightii is dimorphic for leaf trichome type in southern california. "sticky" plants produce glandular trichomes that secrete acylsugars, whereas velvety plants produce nonglandular trichomes. glandular trichomes confer resistance to some potential insect herbivores and are associated with reduced feeding in the field by two native coleopteran herbivores: the tobacco flea beetle, epitrix hirtipennis, and a weevil, trichobaris compacta. in contrast, another native beetle, lema daturaphila, ... | 2005 | 16222787 |
| herbivores can select for mixed defensive strategies in plants. | resistance and tolerance are the most important defense mechanisms against herbivores. initial theoretical studies considered both mechanisms functionally redundant, but more recent empirical studies suggest that these mechanisms may complement each other, favoring the presence of mixed defense patterns. however, the expectation of redundancy between tolerance and resistance remains unsupported. in this study, we tested this assumption following an ecological genetics field experiment in which t ... | 2013 | 23171270 |
| production of herbivore-induced plant volatiles is constrained seasonally in the field but predation on herbivores is not. | natural enemies of herbivorous insects utilize numerous cues to locate and identify their prey. one class of such cues is volatile organic compounds (vocs) often produced by plants after attack by herbivores (hereafter herbivore-induced plant volatiles or hipvs). under simplified laboratory conditions, natural enemies often make clear choices between different hipv blends, but such clear choices may be more difficult in more complex field environments. we studied the impact of voc production by ... | 2011 | 21484445 |
| ontogeny and season constrain the production of herbivore-inducible plant volatiles in the field. | herbivores may induce plants to produce an array of volatile organic compounds (herbivore-induced plant volatiles, or hipvs) after damage, and some natural enemies of herbivores are attracted by those hipvs. the production of hipvs by the undomesticated species datura wrightii was quantified in response to damage by its natural community of herbivores or the plant hormone methyl jasmonate (meja) over plant's 6-month growing season. patterns of hipv production were compared to the seasonal abunda ... | 2010 | 21058044 |
| indirect cost of a defensive trait: variation in trichome type affects the natural enemies of herbivorous insects on datura wrightii. | the costs and benefits of defensive traits in plants can have an ecological component that arises from the effect of defenses on the natural enemies of herbivores. we tested if glandular trichomes in datura wrightii, a trait that confers resistance to several species of herbivorous insects, impose an ecological cost by decreasing rates of predation by the natural enemies of herbivores. for two common herbivores of d. wrightii, lema daturaphila and tupiocoris notatus, several generalized species ... | 2005 | 15800744 |
| evolutionary changes in plant tolerance against herbivory through a resurrection experiment. | both theoretical and empirical works have highlighted the difference in the evolutionary implications of host resistance and tolerance against their enemies. however, it has been difficult to show evolutionary changes in host defences in natural populations; thus, evaluating theoretical predictions of simultaneous evolution of defences remains a challenge. we studied the evolutionary changes in traits related to resistance and tolerance against herbivory in a natural plant population using seeds ... | 2014 | 24417372 |
| the effect of frequency-dependent selection on resistance and tolerance to herbivory. | negative frequency-dependent selection (fds), where rare genotypes are favoured by selection, is commonly invoked as a mechanism explaining the maintenance of genetic variation in plant defences. however, empirical tests of fds in plant-herbivore interactions are lacking. we evaluated whether the oviposition preference of the specialist herbivore lema daturaphila is a mechanism through which this herbivore can exert fds on its host plant datura stramonium. the frequency of contrasting resistance ... | 2016 | 26411698 |