Abstract
Larvae of the cabbage white Pieris rapae are specialists on plants belonging to the family Brassicaceae (Cruciferae). Adult females have been shown to use the glucosinolate gluconasturtiin (phenylethylglucosinolate) as a recognition cue for cruciferous plants, so they can identify an appropriate host for oviposition (Huang and Renwick in J Chem Ecol 20:1025-1037, 1994). Here, we report our results from a study of the role of this glucosinolate in feeding preferences of P. rapae larvae. The larvae were allowed to choose between leaf disks from the non-host cowpea Vigna sinensis (Fabaceae) that were treated with pure gluconasturtiin in solvent, or solvent alone. Our results showed that gluconasturtiin is a feeding stimulant for P. rapae larvae. A series of chemosensory ablations revealed that this response is mediated by one set of taste sensilla, the sensilla styloconica. Electrophysiological tip recordings revealed two neurons in the lateral sensillum styloconicum that are sensitive to gluconasturtiin. These neurons show significantly higher firing frequencies with 4 mM gluconasturtiin added to the recording pipette than for recording solution alone. We propose that the sensitivity to gluconasturtiin shown by these two taste neurons is an important contributor to the animals' behavioral preference for this compound.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
