Video: Time lapse of a flowering rye grass. Male stamens exert from the inflorescence and their anthers dehisce to reveal highly allergenic pollen grains.
Video: Close up, time lapse of anther dehiscence, during which approx 2,000 pollen grains per sac are exposed to the atmosphere. Pollen remains attached to the anther surface in the absence of a wind disturbance.
Video: Real time rupture of rye grass pollen upon exposure to water. The contents of the pollen are ejected through a ruptured pore on the surface of the pollen grain. Approximately 750 starch granules of micron size are emitted from each pollen grain, along with thousands of nanoparticles of cytoplasmic debris, which can trigger a thunderstorm-associated asthma.