Ultrastructural demonstration of the model of Litopenaeus vannamei (Crustacea, Penaeidae) male sexual maturation and spermatozoal capacitation

 

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Detalles Bibliográficos
Autores: Alfaro-Montoya, Jorge, Braga, André, Vargas, Maribelle, Umaña Castro, Rodolfo
Formato: artículo
Fecha de Publicación:2016
Descripción:The present study demonstrates ultrastructurally the model of Litopenaeus vannamei male sexual maturation and spermatozoal capacitation. The results show that phase 1 of the model occurred in the seminiferous tubules and includes spermatogenesis. In this phase, throughout differentiation of spermatogonia into late spermatids the following processes were observed: (1) decondensation of chromatin; (2) rupture of the nuclear envelope; (3) reduction of the cytoplasm and degeneration of organelles; (4) formation of the acrosome via fusion of cytoplasmic vesicles. Phase 2 comprised of spermatozoal maturation, a process that started with the transfer of late spermatids into the seminiferous ducts and ended with the formation of the acrosomal spike in the terminal ampoules. During this phase, development of the subacrosomal region and lateral electron-dense particles occurred in the seminiferous ducts, which is a novel finding of this species. Phase 3 was observed after spermatophore placement on the female thelycum and was mainly characterized by ultrastructural changes in the nucleus and the subacrosomal region. These results are in agreement with the model of male sexual maturation and spermatozoal capacitation proposed for L. vannamei.
País:Repositorio UNA
Institución:Universidad Nacional de Costa Rica
Repositorio:Repositorio UNA
Lenguaje:Inglés
OAI Identifier:oai:https://repositorio.una.ac.cr:11056/17556
Acceso en línea:http://hdl.handle.net/11056/17556
http://dx.doi.org/10.1080/07924259.2016.1244573
Access Level:acceso abierto
Palabra clave:CRUSTÁCEOS
ORGÁNOS REPRODUCTIVOS
ESPERMATOGÉNESIS
SPERMATOZOAL MATURATION
CAPACITACIÓN