spacer gif spacer gif spacer gif spacer gif spacer gif
QUICK SEARCH:   [advanced]


spacer gif
     Home     Help     Feedback     Subscriptions     Archive     Search     Table of Contents    

This Article
Right arrow Full Text (PDF)
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Similar articles in PubMed
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Right arrow reprints & permissions
Citing Articles
Right arrow Citing Articles via HighWire
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Brawley, S. H.
Right arrow Articles by Wetherbee, R.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Brawley, S. H.
Right arrow Articles by Wetherbee, R.
Social Bookmarking
Add to CiteULike   Add to Complore   Add to Connotea   Add to Del.icio.us   Add to Digg   Add to Reddit   Add to Technorati   Add to Twitter  
What's this?

Journal of Cell Science, Vol 20, Issue 2 233-254, Copyright © 1976 by Company of Biologists

JOURNAL ARTICLES

Fine-structural studies of the gametes and embryo of Fucus vesiculosus L. (Phaeophyta). I. Fertilization and pronuclear fusion

SH Brawley, RS Quatrano and R Wetherbee

In the marine brown alga, Fucus vesiculosus L., the sperm pronucleus is delimited by an envelope following penetration of the eff by the sperm. This envelope disintegrates as the pronucleus begins its migration through the cytoplasm of the egg. The highly condensed chromatin of the sperm pronucleus disperses slightly following disintegration of the envelope. Microtubules of unknown origin are associated with the sperm pronucleus during its migration. The flagellar microtubules remain in the peripheral cytoplasm but lose their tight 9 + 2 configuration. The sperm eyespot and mitochondria follow the pronucleus through the cytoplasm toward the egg pronucleus. The mitochondria of the sperm are distinguished from those of the egg by their longitudinally oriented cristae and by electron-opaque material in the intracristal space. The pronucleus of the egg becomes convoluted along the surface nearest to the advancing sperm pronucleus. Immediately prior to pronuclear fusion, many egg mitochondria aggregate in the vicinity of the sperm pronucleus. At this time, only the portion of the sperm pronucleus facing the egg pronucleus is surrounded by an envelope. The egg mitochondria disperse rapidly after pronuclear fusion. The sperm mitochondria and eyespot are still in the perinuclear region in 16-h-old embryos. At this time, the osmiophilia of the sperm eyespot has increased, and the sperm mitochondrial membranes are less distinct than in earlier stages. The fine-structural features of fertilization in Fucus are discussed in relation to the fertilization patterns in other cryptogams and marine invertebrates and to polar axis determination in the Fucaceae.
Add to CiteULike CiteULike   Add to Complore Complore   Add to Connotea Connotea   Add to Del.icio.us Del.icio.us   Add to Digg Digg   Add to Reddit Reddit   Add to Technorati Technorati   Add to Twitter Twitter    What's this?


This article has been cited by other articles:


Home page
 ANN BOT (LOND)Home page
C. KATSAROS, D. KARYOPHYLLIS, and B. GALATIS
Cytoskeleton and Morphogenesis in Brown Algae
Ann. Bot., May 1, 2006; 97(5): 679 - 693.
[Abstract] [Full Text] [PDF]

Home page
 J. Cell Sci.Home page
F. Corellou, S. M. B. Coelho, F.-Y. Bouget, and C. Brownlee
Spatial re-organisation of cortical microtubules in vivo during polarisation and asymmetric division of Fucus zygotes
J. Cell Sci., June 15, 2005; 118(12): 2723 - 2734.
[Abstract] [Full Text] [PDF]

Home page
 Proc. Natl. Acad. Sci. USAHome page
A. F. Antoine, J.-E. Faure, S. Cordeiro, C. Dumas, M. Rougier, and J. A. Feijo
A calcium influx is triggered and propagates in the zygote as a wavefront during in vitro fertilization of flowering plants
PNAS, September 12, 2000; 97(19): 10643 - 10648.
[Abstract] [Full Text] [PDF]


© The Company of Biologists Ltd 1976