Graft-chimaera

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The small tree + Laburnocytisus 'Adamii' is a spectacular example of a graft-chimaera +Laburnocytisus Wideangle.jpg
The small tree + Laburnocytisus 'Adamii' is a spectacular example of a graft-chimaera

In horticulture, a graft-chimaera may arise in grafting at the point of contact between rootstock and scion and will have properties intermediate between those of its "parents". A graft-chimaera is not a true hybrid but a mixture of cells, each with the genotype of one of its "parents": it is a chimaera. Hence, the once widely used term "graft-hybrid" is not descriptive; it is now frowned upon.

Contents

Propagation is by cloning only. In practice graft-chimaeras are not noted for their stability and may easily revert to one of the "parents".

Nomenclature

Article 21 of the ICNCP stipulates that a graft-chimaera can be indicated either by

Crataegus + Mespilus

A graft-chimaera cannot have a species name, because it is simultaneously two species. Although + Laburnocytisus 'Adamii', for example, is sometimes seen written as if it were a species (+ Laburnocytisus adamii), this is incorrect.[ citation needed ]

In Darwin's works

Charles Darwin "The Variation of Animals and Plants Under Domestication" Archived 2009-02-05 at the Wayback Machine , 1868 г.:

I will therefore give all the facts which I have been able to collect on the formation of hybrids between distinct species or varieties, without the intervention of the sexual organs. For if, as I am now convinced, this is possible, it is a most important fact, which will sooner or later change the views held by physiologists with respect to sexual reproduction. A sufficient body of facts will afterwards be adduced, showing that the segregation or separation of the characters of the two parent-forms by bud-variation, as in the case of Cytisus adami, is not an unusual though a striking phenomenon. We shall further see that a whole bud may thus revert, or only half, or some smaller segment.

Genera

The following graft-chimaera genera are accepted: [2]

See also

Notes

  1. + Crataegomespilus is now considered a synonym for Crataegus . [1]

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References

  1. "+ Crataegomespilus Simon-Louis ex Bellair". Plants of the World Online . Royal Botanic Gardens, Kew . Retrieved 20 December 2023.
  2. "POWO". Plants of the World Online. Royal Botanic Gardens, Kew. 2023. Retrieved 20 December 2023.
  3. "+ Arioechinopsis Mottram". Plants of the World Online . Royal Botanic Gardens, Kew . Retrieved 20 December 2023.
  4. "+ Coryopuntia Mottram". Plants of the World Online . Royal Botanic Gardens, Kew . Retrieved 20 December 2023.
  5. "+ Echinastrophytum Mottram". Plants of the World Online . Royal Botanic Gardens, Kew . Retrieved 20 December 2023.
  6. "+ Echinogymnocalycium Mottram". Plants of the World Online . Royal Botanic Gardens, Kew . Retrieved 20 December 2023.
  7. "+ Myrtigymnocalycium Mottram". Plants of the World Online . Royal Botanic Gardens, Kew . Retrieved 20 December 2023.
  8. "+ Ortegopuntia Tóth". Plants of the World Online . Royal Botanic Gardens, Kew . Retrieved 20 December 2023.
  9. "+ Pyrocydonia Guillaumin". Plants of the World Online . Royal Botanic Gardens, Kew . Retrieved 20 December 2023.
  10. "+ Uebelechinopsis G.D.Rowley". Plants of the World Online . Royal Botanic Gardens, Kew . Retrieved 20 December 2023.