Uridine-H 3 is incorporated into both the vegetative (tube) nucleus and the generative nucleus of Tradescantia paludosa within 15 min after transfer of pollen to the growth medium. This incorporation ...

The pollen tube is a growth from a pollen grain down into the flower style which allows two sperm cells to pass, one to the ovum within the ovule, and the other to the central cell of the ovule. This ...

1. The male cells are organized in the pollen grain following division of the generative cell, and are united by their tips until the embryo sac is reached. 2. The sperms become greatly elongated ...