The chemosensory basis for behavioral divergence involved in sympatric host shifts. I. Characterizing olfactory receptor neuron classes responding to key host volatiles |
| |
Authors: | Shannon B Olsson Charles E Linn Jr Wendell L Roelofs |
| |
Institution: | (1) Department of Neurobiology and Behavior, Cornell University, Ithaca, NY 14850, USA;(2) Department of Entomology, NYS Agricultural Experiment Station, Cornell University, Geneva, NY 14456, USA;(3) NYSAES, Cornell University, Geneva, NY 14456, USA |
| |
Abstract: | The recent shift of Rhagoletis pomonella from its native host hawthorn to introduced, domestic apple has been implicated as an example of sympatric speciation. Recent
studies suggest that host volatile preference might play a fundamental role in host shifts and subsequent speciation in this
group. Single sensillum electrophysiology was used to test a proposed hypothesis that differences in R. pomonella olfactory preference are due to changes in the number or odor specificity of olfactory receptor neurons. Individuals were
analyzed from apple, hawthorn, and flowering dogwood-origin populations, as well as from the blueberry maggot, Rhagoletis mendax Curran (an outgroup). Eleven compounds were selected as biologically relevant stimuli from previous electroantennographic/behavioral
studies of the three R. pomonella populations to host fruit volatiles. Cluster analysis of 99 neuron responses showed that cells from all tested populations
could be grouped into the same five classes, ranging from those responding to one or two volatiles to those responding to
several host volatiles. Topographical mapping also indicated that antennal neuron locations did not differ by class or fly
taxa. Our results do not support the hypothesis that differences in host preference among Rhagoletis populations are a result of alterations in the number or class of receptor neurons responding to host volatiles. |
| |
Keywords: | Rhagoletis Specificity Discrimination Antagonism Single sensillum electrophysiology |
本文献已被 SpringerLink 等数据库收录! |
|