Mean (+1 se) mass of 30 replicate M. sexta larvae fed on pTVGER and pTV00 plants, 4, 7, and 10 d after the larvae hatched and were placed on nodes +1 and +2 leaves of 15 plants each with two larvae. Inserts: A, Mean (+1 se) expression levels of GLP in node +1 leaves, by qPCR analysis, 1 d after leaves from nodes +1 and +2 were attacked by one freshly hatched caterpillar. B and C, Mean (+1 se) DTG (B) and TrypPI (C) concentrations in node +2 leaves of pTVGER and pTV00 plants, 4 d after leaves from nodes +1 and +2 leaves were attacked by one freshly hatched caterpillar. Asterisks indicate significant differences between members of a pair (pTVGER versus pTV00; P < 0.05, Student's t test).