Role of male accessory glands in spermatodesm reorganization in Orthoptera Tettigonioidea.

A preliminary examination of the spermatodesms of Orthoptera Tettigonioidea revealed a structure that is similar in individuals of the same sex but very different in specimens of opposite sex. This reorganization would seem to take place inside the spermatophore during transit from the male to female genital tracts. The results of incubating spermatodesms with the secretions of glandular extract (GE) obtained from male accessory glands, known to be involved in forming the spermatophore wall, revealed changes in the spermatodesm 'cap' that are comparable to those occurring in vivo. Moreover, incubation of spermatodesms with the extracts obtained separately from tubules of the 1st and 2nd orders (GE1, GE2) established that GE2 alone modifies the spermatodesms, thus excluding the possible implication of 1st order tubules in the rearrangement process. In conclusion, data from incubations of spermatodesms with the single fractions obtained by submitting GE2 to gel-filtration FPLC show that only the peak 4 maintains intact the biological activity of GE2, SDS-PAGE analysis of the fraction corresponding to peak 4 revealed a greater protein content of 29 kD, which also appears to a lesser degree in fraction 3. This material is responsible for a partial dismantling of the 'cap' in the incubated spermatodesms.