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noun, Botany.
the protoplasmic tube that is extruded from a germinating pollen grain and grows toward the ovule.
a hollow tubular outgrowth that develops from a pollen grain after pollination, grows down the style to the ovule, and conveys male gametes to the egg cell
pollen tube
The slender tube that is formed after pollination by division of the tube cell in a pollen grain. The pollen tube penetrates the ovule and releases the male gametes.


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