radicleThe part of a seed plant embryo that develops into the root. When the radicle emerges from a germinating seed, its tip is protected by a root cap (calyptra) which enables it to break through the seed case (testa) and penetrate the soil. In most plants, the radicle originates the whole root system. Related category• BOTANYAlso on this site: Encyclopedia of Alternative Energy & Sustainable Living Encyclopedia of History |