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.