Figure 3.

Hydration of pollen grains surrounded by exudate or mineral oil but close to an interface with an aqueous medium. Each point represents a pollen grain. A, The degree of hydration of pollen grains in exudate or mineral oil 3 h after the establishment of the interface with the aqueous medium. B, Variation in the flux of water through exudate to pollen grains with distance from the interface (estimated during the first 90 min of pollen hydration).