pollen tubepollen tube
Bot. the tubelike growth that emerges from a germinating pollen grain and enters the embryo sac in an ovule: a male gamete passes through it to fertilize the female gamete
A slender tube that is formed by a pollen grain of a seed plant and penetrates the ovule, where it releases the male gametes.
(plural pollen tubes)
- the tube that develops from the wall of a pollen grain and, in seed plants, provides a passage through which the male nuclei reach the embryo sac to effect fertilization