Note to users. If you're seeing this message, it means that your browser cannot find this page's style/presentation instructions -- or possibly that you are using a browser that does not support current Web standards. Find out more about why this message is appearing, and what you can do to make your experience of our site the best it can be.


Logo for

Science 338 (6110): 1038-1039

Copyright © 2012 by the American Association for the Advancement of Science

Plant Gametes Do Fertilization with a Twist

William J. Snell

Cell Biology Department, University of Texas Southwestern Medical School, Dallas, TX 75390, USA.

Figure 1
View larger version (61K):
[in this window]
[in a new window]

Fertilization across phyla. As in algae and animals, Arabidopsis gametes undergo mutual activation. Upon sperm arrival, the egg cell secretes EC1 proteins that trigger sperm to display previously cryptic HAP2. Adhesion between Chlamydomonas gametes also triggers exposure of cryptic HAP2, and in mammals, sperm binding to egg triggers exposure of Izumo-1. Only in the two plant systems are both gametes activated before fusion.


To Advertise     Find Products

Science Signaling. ISSN 1937-9145 (online), 1945-0877 (print). Pre-2008: Science's STKE. ISSN 1525-8882