Abstract：
:Lepidopteran males produce eupyrene (nucleate) and apyrene (anucleate) spermatozoa, but in the female only eupyrene spermatozoa leave the spermatheca and fertilize the eggs. Both kinds of spermatozoa lack intrinsic motility in the male genital duct. They become motile in the spermatophore, in a process involving proteases from the male duct. In vitro, trypsin induces immotile spermatozoa to become motile. We studied the changes spermatozoa of Manduca sexta undergo during trypsin-induced motility and found that (a) they mimick rather closely those occurring in vivo during normal sperm maturation in genital ducts and (b) they are time- and dose-dependent. As in vivo, they comprise, successively, (a) disappearance of an extracellular matrix that maintains the integrity of eupyrene bundles in the seminal vesicle, (b) dispersion of the eupyrene bundles and intermingling of eupyrene and apyrene spermatozoa and (c) "hatching" of eupyrene spermatozoa from individual enclosing envelopes that are formed in the seminal vesicle. "Hatching" may not directly be related to motility since eupyrene spermatozoa become motile before "hatching" and motile apyrene spermatozoa never "hatch". Rather "hatching" may be related to the capacitation of eupyrene spermatozoa to either leave the spermatheca or fertilize the eggs, or both, as neither apyrene spermatozoa, nor those eupyrene spermatozoa that fail to "hatch", leave the spermatheca.
journal_name
J Insect Physioljournal_title
Journal of insect physiologyauthors
Friedländer M,Jeshtadi A,Reynolds SEdoi
10.1016/s0022-1910(00)00109-8keywords:
subject
Has Abstractpub_date
2001-03-01 00:00:00pages
245-255issue
3eissn
0022-1910issn
1879-1611pii
S0022191000001098journal_volume
47pub_type
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