Like seeds, pollen loses most of its water during maturation, entering a state of suspended animation. This allows it to survive its journey from male to female organs of a flower, where it is rehydrated by sugary fluids secreted by the female organ, and springs into life again. (click here to read more)

Also see (http://wildtypes.asbmb.org/2015/10/22/mechanically-gated-channels-play-a-role-in-plant-sex/)