Bicellular Pollen of the Pond Lily, <i>Nuphar advena</i> at the Time of its Dispersal by Insects. (IMAGE)

Botanical Society of America

Bicellular Pollen of the Pond Lily, <i>Nuphar advena</i> at the Time of its Dispersal by Insects.

Caption

Bicellular pollen of the pond lily, Nuphar advena at the time of its dispersal by insects. The vegetative body of the gametophyte consists of a single cell and takes up the entire space within the pollen grain. A separate "generative" cell, that will eventually give rise to the two sperm cells, is free within the cytoplasm of the "vegetative cell." Shown are the nuclei of these two cells stained with a DNA-binding fluorochrome -- the bright one is the generative nucleus and the large, faint vegetative nucleus is directly adjacent to and surrounding it.

Credit

Joseph Williams.

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