Ultrastructure of oogenesis in Penaeus kerathurus (Crustacea, Decapoda). II. Vitellogenesis

• Type: Article in International Scientific Journal
• Date: 1998

Authors

Carvalho, F (Author) Other; sousa, m (Author) ICBAS; Oliveira, E (Author) Other; Carvalheiro, J (Author) Other; Baldaia, L (Author) Other

Journal

Title: Journal of Submicroscopic Cytology and Pathology

Vol. 30

Pages: 527-535

ISSN: 1122-9497

Publisher: N I E Nuova Immagine Editrice

Indexing

ISI Web of Knowledge - 3 Citations

Scopus - 6 Citations

Other information

Authenticus ID: P-001-71D

Abstract (EN): The ultrastructure of vitellogenesis in Penaeus kerathurus is presented. Early vitellogenesis is characterized by the predominance of receptor mediated endocytosis, forming dense vesicles that rapidly loose their coating. This exogenous sourer of yolk is, however, directly used to form yolk vesicles that also receive components of the Golgi apparatus and the endoplasmic reticulum. These mixed-type yolk vesicles then fuse together and form large dense yolk resides. During this stage, some of the rough endoplasmic reticulum vesicles also give rise to large yolk vesicles that have an intermediate dense content and whose limiting membrane appears rather labile. Midvitellogenesis is a brief period with dramatic changes occurring within the endoplasmic reticulum. First, rough endoplasmic reticulum vesicles give rise to large amounts df rough endoplasmic reticulum tubules filled with a fine fibrillar matrix. After this phase, rough endoplasmic reticulum vesicles fuse and expand, forming a large anastomotic reticulum that encircles and assists formation of a large number of intermediate dense yolk vesicles. This type of yolk vesicles represents the yolk stock of mature oocytes, and their labile limiting membrane will allow engulfment of several different oocyte structures, namely, smooth endoplasmic reticulum tubules, dense (mixed origin) yolk vesicles, Golgian vesicles and vacuoles, and numerous concentrical arrays of smooth endoplasmic reticulum derived membranes. In conclusion, yolk production in P. kerathurus has a mixed (endogenous and exogenous) origin, and shows rather infrequent endoplasmic reticulum activities.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 9