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Abstract:

Synbranchus marmoratus, is a protogynic diandric species in which two types of males, primary and secondary, are found. In both types, the germinal compartment in the testes is of the unrestricted lobular type, but in secondary (sex reversed females) males the lobules develop within the former ovarian lamellae. In the present study, the germinal compartment was examined in both types of males using light microscopy as well as scanning and transmission electron microscopy. Germinal compartment is limited by a basement membrane and contains Sertoli and germ cells. During maturation, processes of Sertoli cells form the borders of spermatocysts containing isogenic germ cells. Characteristically, type A and type B spermatogonia have a single nucleolus and grouped mitochondria associated with dense bodies or nuage. Type B spermatogonia, spermatocytes and spermatids are joined by cytoplasmatic bridges and are confined within spermatocysts. Secondary spermatocytes are difficult to find, indicating that this stage is of short duration. Biflagellated spermatozoa have a rounded head, no acrosome, and possess a midpiece consisting of two basal bodies, each of which produces a flagellum with a typical 9 + 2 microtubular composition. No associations occur between sperm and Sertoli cells. There were no differences between spermatogenesis in primary and secondary males in this protogynic, diandric fish. © 2003 Elsevier Science Ltd. All rights reserved.

Registro:

Documento: Artículo
Título:Ultrastructure of the testis in Synbranchus marmoratus (Teleostei, Synbranchidae): The germinal compartment
Autor:Lo Nostro, F.L.; Grier, H.; Meijide, F.J.; Guerrero, G.A.
Filiación:Depto. de Biodiver. y Biologia Exp., Fac. de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Pab. II, 4to piso, Buenos Aires C1428EHA, Argentina
Stock Enhancement Research Facility, Florida Marine Research Institute, 14495 Harllee Road, Palmetto, FL 34221-9620, United States
Palabras clave:Biflagellated sperm; Germinal compartment; Sex reversal; Spermatogenesis; Synbranchidae; Synbranchus marmoratus; acrosome; animal cell; animal tissue; article; basement membrane; cell maturation; cell type; cell ultrastructure; controlled study; dense body; germ cell; kinetosome; male; microscopy; mitochondrion; nonhuman; nucleolus; scanning electron microscopy; Sertoli cell; sperm; spermatid; spermatocyte; spermatogenesis; spermatogonium; spermatozoon; spermatozoon tail; teleost; testis; transmission electron microscopy; Synbranchidae; Synbranchus marmoratus; Teleostei
Año:2003
Volumen:35
Número:2
Página de inicio:121
Página de fin:132
DOI: http://dx.doi.org/10.1016/S0040-8166(03)00011-9
Título revista:Tissue and Cell
Título revista abreviado:Tissue Cell
ISSN:00408166
CODEN:TICEB
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00408166_v35_n2_p121_LoNostro

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Citas:

---------- APA ----------
Lo Nostro, F.L., Grier, H., Meijide, F.J. & Guerrero, G.A. (2003) . Ultrastructure of the testis in Synbranchus marmoratus (Teleostei, Synbranchidae): The germinal compartment. Tissue and Cell, 35(2), 121-132.
http://dx.doi.org/10.1016/S0040-8166(03)00011-9
---------- CHICAGO ----------
Lo Nostro, F.L., Grier, H., Meijide, F.J., Guerrero, G.A. "Ultrastructure of the testis in Synbranchus marmoratus (Teleostei, Synbranchidae): The germinal compartment" . Tissue and Cell 35, no. 2 (2003) : 121-132.
http://dx.doi.org/10.1016/S0040-8166(03)00011-9
---------- MLA ----------
Lo Nostro, F.L., Grier, H., Meijide, F.J., Guerrero, G.A. "Ultrastructure of the testis in Synbranchus marmoratus (Teleostei, Synbranchidae): The germinal compartment" . Tissue and Cell, vol. 35, no. 2, 2003, pp. 121-132.
http://dx.doi.org/10.1016/S0040-8166(03)00011-9
---------- VANCOUVER ----------
Lo Nostro, F.L., Grier, H., Meijide, F.J., Guerrero, G.A. Ultrastructure of the testis in Synbranchus marmoratus (Teleostei, Synbranchidae): The germinal compartment. Tissue Cell. 2003;35(2):121-132.
http://dx.doi.org/10.1016/S0040-8166(03)00011-9