Fig. 4. A comparison of the cross-sectional area of longitudinal muscles 169 and 214 from female locusts at different stages of development. (A,B) Cross sections revealed a significant, but not dramatic, hypertrophy of M169 during reproductive development (left-hand panel, <5 days old versus >18 days old). To examine a possible role for juvenile hormone in the hypertrophy, muscles from precocene-treated animals were also compared. For M169, there was no significant reduction in cross-sectional area evident for females treated with precocene (A,B; >18 days old versus >18 days old, precocene-treated). Muscle 214 (A,B, right-hand panel) showed marked hypertrophy during maturation. The degree of hypertrophy was significantly decreased in females treated with precocene (B, right-hand panel >18 days old versus >18 days old, precocene-treated), although values were still considerably higher than those of females less than 5 days old. The lines in B indicate significant differences (P<0.05, ANOVA with Tukey test). The number of experiments is given in parentheses. Values are means + S.E.M.
