rootstock

juurakko

maavarsi puhekieltä A healthy and vigorous-rooted plant that is used in grafting, most commonly as a sound base to support a scion that bears desirable fruit in orchard culture.
puhekieltä The necessary basis for something to develop
{{quote-journal|date=January 30, 2009|author=Simon Jenkins|title=For real secrets we already have the one-and-a-half-year memoir rule|work=The Guardian|url=http://www.guardian.co.uk/commentisfree/2009/jan/30/freedom-of-information-press