Different growth patterns of two adjacent glomeruli responsible for sex-pheromone processing during postembryonic development of the cockroach Periplaneta americana

摘要: In many insect species, sex pheromone is processed by specific, enlarged glomeruli in the antennal lobes of males. male American cockroach, two closely located (A and B) are responsible for processing major components (periplanone-A -B, respectively), these collectively form macroglomerular complex. Afferents originating from dorsal ventral surfaces antenna tend to project anterior posterior regions complex via nerves, respectively. This topographic segregation afferents seen only complex, not other that process normal environmental odors. Using differential, anterograde dye injection into sensory we show formed fusion several glomeruli, as suggested previous studies, but precursors A- B-glomeruli already exist first larval instar. The volume precursor increases nearly exponentially with molting times, 430-fold instar adult. both undergo continuous growth during postembryonic development, peak rates occur different stages. rate B-glomerulus peaked mid-developmental stage then declined, while A-glomerulus was maintained at low level early- stages increased greatly later These results suggest perception occurs early instars, PA PB have distinct roles developmental