Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun A root system of a plant, often with a portion of the stem, to which a shoot or bud is grafted.

from The Century Dictionary.

  • noun In botany, same as rhizome.
  • noun The original ground or cause of anything; a root.
  • noun In zoology, a cormus, as of a zoöphyte; a rhizocaulus.

from the GNU version of the Collaborative International Dictionary of English.

  • noun (Bot.) A perennial underground stem, producing leafly s�ems or flower stems from year to year; a rhizome.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun agriculture A healthy plant that is used as the base for grafting a scion
  • noun by extension The necessary basis for something to develop

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun root or part of a root used for plant propagation; especially that part of a grafted plant that supplies the roots
  • noun a horizontal plant stem with shoots above and roots below serving as a reproductive structure

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

root +‎ stock

Examples

  • An example of the superiority of the black walnut over the Persian walnut as a rootstock is a seedling of the variety Wiltz Mayette growing near a Broadview grafted on black walnut.

    Northern Nut Growers Association Report of the Proceedings at the Forty-Second Annual Meeting Urbana, Illinois, August 28, 29 and 30, 1951

  • He found that one kind of rootstock turned on twice as many stress tolerance genes in the scion as the other — and that that scion was more resistant to a bacterial disease called fire blight.

    Archive 2006-03-19

  • He found that one kind of rootstock turned on twice as many stress tolerance genes in the scion as the other — and that that scion was more resistant to a bacterial disease called fire blight.

    Progress in pomology

  • "You usually have a rootstock which is well adapted to growing, deep roots, disease resistant ... and then you put your desired variety at the top.

    The Ukiah Daily Journal Forum

  • The bitter oranges must be mighty different from the Sour Orange rootstock used in South Texas ....

    Lemon Tree - MAIN THREAD

  • Sweet black cherries grafted on to vigorous rootstock were common in the valley until 50 years ago.

    Country diary: St Dominic, Tamar Valley

  • Several varieties were all growing on Gisela 5 rootstock, which keeps the trees compact, and under frames of netting to keep out the birds – mainly blackbirds, though this year mistle thrushes too.

    Country diary: West Lambrook, Somerset

  • Sprigs of Burcombe, Fice, Upright, Birchenhayes and Smutts were all grafted on to special dwarfing rootstock two years ago.

    Country diary: St Dominic, Tamar Valley

  • Different varieties of lemons are grafted onto a rootstock which 'tricks' the tree into thinking it's a much older tree and they bear fruit quite quickly.

    Lemon Tree

  • “It would be a shame to wipe out the rootstock of all the great cars that followed, to see a utopian symbol like the Jeep Grand Wagoneer or a car with the rich personality of an Alfa Romeo 164 get clobbered,” he said.

    Sunday Reading

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