On Sat, Jun 5, 2010 at 11:25 AM, MC Arunan <mcaru...@gmail.com> wrote:
> Dear all, > tgk in the Biology_Networkgroup sends us this report on Immune related > molecules involved in plant fertilization. See below an excerpt. If any one > needs full acccount with links please write to us. > Arunan > for > Biology Network > > Today, more than a century after a German-Polish botanist first described > the process of fertilization in flowering plants, scientists have identified > an elusive molecular signal critical to that process. > The finding sheds light on the evolution of plant fertilization mechanisms > and could lead to strategies to overcome species-specific barriers for > crossbreeding crops. > > > When a pollen grain, which contains the male sperm, lands on another plant, > it grows a pollen tube into the female reproductive tissues. Eventually, the > pollen tube halts and bursts to release two sperm cells, one to fertilize > the egg and another to fuse with a female cell and generate the endosperm, a > tissue providing nutrition to the embryo. But little has been known about > the cell-to-cell signaling between the male and female cells that causes the > pollen tube to stop growing and rupture. > > Nine years ago, while looking for molecules that attract the pollen tube > toward the female egg cells in maize, Thomas Dresselhaus and colleagues at > the University of Regensburg in Germany stumbled across four defensin-like > proteins expressed exclusively in the embryo sac. *It was a strange > discovery, since defensin proteins are typically involved in the immune > systems of plants, insects, and other animals. > > * > > -- > You received this message because you are subscribed to the Google Groups > "wikied_andc" group. > To post to this group, send email to wikied_a...@googlegroups.com. > To unsubscribe from this group, send email to > wikied_andc+unsubscr...@googlegroups.com<wikied_andc%2bunsubscr...@googlegroups.com> > . > For more options, visit this group at > http://groups.google.com/group/wikied_andc?hl=en. > -- Savithri Singh Principal Acharya Narendra Dev College (University of Delhi) Govindpuri, Kalkaji New Delhi 110019 Ph: 011 26294542, 011 29293224 Res: 25848151, 25843496 Fax: 011 26294540, Res: 25848151 http://beta.thehindu.com/sci-tech/article397395.ece http://eduframe.net/andc http://andcollege.du.ac.in http://andc.info http://wikieducator.org/Acharya_Narendra_Dev_College http://wikieducator.org/User:Savi.odl http://wikieducator.org/India http://wikieducator.org/India/wikieducator_launch Please do not print this email unless it is absolutely necessary. Spread environmental awareness. -- You received this message because you are subscribed to the Google Groups "WikiEducator" group. To visit wikieducator: http://www.wikieducator.org To visit the discussion forum: http://groups.google.com/group/wikieducator To post to this group, send email to wikieducator@googlegroups.com To unsubscribe from this group, send email to wikieducator-unsubscr...@googlegroups.com
