Sunday, May 20, 2012

Multiple pollen tubes

Going back to last quarter but I thought this paper in Current Biology this month was interesting: Gamete Fusion Is Required to Block Multiple Pollen Tubes from Entering an Arabidopsis Ovule

Plants need to make sure that their female gametes are fertilized but they also need to make sure that only two fertile sperm reach the ovule.

When gamete fusion fails, one of two pollen tube-attracting synergid cells persists, enabling the ovule to attract more pollen tubes for successful fertilization. This mechanism prevents the delivery of more than one pair of sperm to an ovule, provides a means of salvaging fertilization in ovules that have received defective sperm, and ensures maximum reproductive success by distributing pollen tubes to all ovules.


No comments: