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First published online October 10, 2003

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Chemosensory tuning to a host recognition cue in the facultative specialist larvae of the moth Manduca sexta

Marta L. del Campo^* and Carol I. Miles

Department of Biological Sciences, Binghamton University, State University of New York, Binghamton, NY 13902-6000, USA

View larger version (19K): [in a new window]   Fig. 1. Typical taste receptor responses to chemostimulation of the lateral sensillum at initial contact. Traces are for a 200 ms period, and for each diet all traces are from the same larva.

View larger version (19K): [in a new window]   Fig. 2. Typical taste receptor responses to chemostimulation of the medial sensillum at initial contact. Traces are for a 200 ms period, and for each diet all traces are from the same larva.

View larger version (16K): [in a new window]   Fig. 3. Phasic portion (first 200 ms after contact) of the chemosensory responses of sensilla styloconica. (A) Lateral sensilla responses of solanaceous-reared larvae (N=16) and wheat germ diet-reared larvae (N=16). (B) Medial sensilla responses of solanaceous-reared larvae (N=10) and wheat germ diet-reared larvae (N=10). Values are means ± S.E.M. *P<0.05. For details, see text.

View larger version (35K): [in a new window]   Fig. 4. Typical taste receptor responses to chemostimulation of the lateral sensillum at 1 s after initial contact. Traces are for a 500 ms period, and for each diet all traces are from the same larva. S, M1, M2 and L indicate the different types of cells we identified based on the characteristics described in Materials and methods.

View larger version (17K): [in a new window]   Fig. 5. Tonic portion (1-30 s after contact) of chemosensory responses of the lateral sensilla styloconica. (A) Responses of wheat germ diet-reared larvae (N=16). (B) Responses of solanaceous-reared larvae (N=16). Values are means ± S.E.M.

View larger version (35K): [in a new window]   Fig. 6. Typical taste receptor responses to chemostimulation of the medial sensillum at 1 s after initial contact. Traces are for a 500 ms period, and for each diet all traces are from the same larva. The letters S, M1 and M2 indicate the different types of cells we identified based on the characteristics described in the methods. None of the recordings in this data set included an example of an L cell.

View larger version (17K): [in a new window]   Fig. 7. Tonic portion (1-30 s after contact) of the responses of chemosensory responses of the medial sensilla styloconica. (A) Responses of wheat germ diet-reared larvae (N=11). (B) Responses of solanaceous-reared larvae (N=11). Values are means ± S.E.M.

View larger version (28K): [in a new window]   Fig. 8. Responses of individual cells in the lateral sensilla styloconica at 1 s after contact. (A) S cell, (B) M1 cell, (C) M2 cell and (D) L cell. Values are means ± S.E.M. *P<0.05.

View larger version (27K): [in a new window]   Fig. 9. Responses of individual cells in the medial sensilla styloconica at 1 s after contact. (A) S cell, (B) M1 cell, (C) M2 cell and (D) L cell. Values are means ± S.E.M. *P<0.05.

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