radicle
Noun
Meaning
The rudimentary stem of a plant which supports the cotyledons in the seed, and from which the root is developed downward; the stem of the embryo; the caulicle.
A rootlet; a radicel.
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Dormancy of the radicle (seedling root)is broken during the first winter after dispersal while dormancy of the shoot bud is broken during the second winter.
It involves the reactivation of the metabolic pathways that lead to growth and the emergence of the radicle or seed root and plumule or shoot.
The plumule is covered with a coleoptile that forms the first leaf while the radicle is covered with a coleorhiza that connects to the primary root and adventitious roots form from the sides.
Here the hypocotyl is a rudimentary axis between radicle and plumule.
Three distinct phases of seed germination occur: water imbibition; lag phase; and radicle emergence.