Fig. 3. The response of the pyrrolizidine alkaloid (PA) cell to 10^-7 mol l^-1 seneciphylline N-oxide in relation to feeding parameters on Senecio longilobus. (A) Spearman's rank correlation (relating duration of actual ingestion and resultant sensory response) shown for different durations of exposure to S. longilobus. (B) Response of the PA cell to 10^-7 mol l^-1 seneciphylline N-oxide for control insects and individuals that had fed for shorter times (1–35 min) or longer times (>35 min) during the previous 2 h. (C) Response of the PA cell to 10^-7 mol l^-1 seneciphylline N-oxide in insects that had different final bout durations on S. longilobus. Numbers in parentheses indicate number of replicates in each treatment. Arrows indicate median values. Different letters indicate significant differences among groups using Tukey tests at P<0.05.

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