Citrus > Cold Hardy Citrus
Citsuma Prague
Citradia:
I looked up chimera and looks like it is two different species fused together. Do we call this citrandarin chimera instead of hybrid because it has a good mandarin quality fruit on a trifoliata tree, whearas most trifoliate hybrids have a tree body and fruit that is a mix or blending of the two parent trees?
Florian:
Well, Ilya said that the homogenous dna makes it rather unlikely to be a chimera but I am no expert.
Ilya11:
It is believed for a long time to be a chimera, but its origin is very obscure.
It is either originated in Abkhazia region of the USSR or in Prague, Czechoslovakia.
In USSR several attempts were made to produce poncirus/citrus chimera by the induction and subsequent regeneration of massive callus at the grafting point.
By this, they believed to produce plants containing cells from two species (chimeras). Most of such plants are unstable, giving branches of pure species, but occasionally a stable, so called periclinal chimera can be produced.
In the recent study Czech scientists isolated the cell nuclei from this plant, stained their genetic material (DNA) by fluorescent die and determined the intensity of fluorescence signal from individual nuclei. Since the genome of different citruses is slightly different in size, they hopped to see two peaks of fluorescent intensity if it is satsuma/poncirus chimera.
They observed only one, so it is either not a chimera but a hybrid or chimera between poncirus with some hybrid having approximately the same genome size as poncirus.
I guess only molecular markers can definitely resolve the origin of this very strange plant.
Radoslav:
According to Snek, there are three hybrids/chimeras known in former Czechoslovakia.
One is hybrid Unshiu x Poncirus selected by professor Pospisil in seventies, the plant is still in greenhouse of university in Prague.
(from the book „Pěstování citrusů“, c. SZN 1987, Ing. Stanislav Hušák, CSc., Doc.Ing. Vladimír Táborský, CSc., Prof. Ing. Pavel Valíček, DrSc.)
Second one is Chimere no.19 (unshiu poncirus) from USSR.
)
(from the book „Pěstování citrusů“, c. SZN 1987, Ing. Stanislav Hušák, CSc., Doc.Ing. Vladimír Táborský, CSc., Prof. Ing. Pavel Valíček, DrSc.
And third one: hybrid P.t. X Unshiu from USSR too.
Ilya11:
--- Quote from: Radoslav on April 18, 2017, 04:48:44 AM ---According to Snek, there are three hybrids/chimeras known in former Czechoslovakia.
One is hybrid Unshiu x Poncirus selected by professor Pospisil in seventies, the plant is still in greenhouse of university in Prague.
--- End quote ---
Radoslav,
Have you seen the recent photos of this surviving plant?
For me the old black and white picture of it looks very similiar to what I have in the garden.
On other hand, the picture from Riverside is also similiar, although their plant is described as chimera from Abkhazia.
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