Start from the beginning Rosseyanka aka Russian Beauty is a 50% hybrid.
Rosseyanka persimmon was bred from (Diospyros virginiana x Diospyros kaki) 50/50. Rosseyanka Persimmon trees are an extremely cold hardy Russian hybrid crossed with an American native Persimmon… Rosseyanka persimmon was one of the first cross breeds of American persimmon Diospyros virginiana persimmon and the Asian Kaki persimmon.
@Harbin has said before a number of years ago
“Rosseyanka originated in 1959 by Pasenkov at the Nikitsky Botanical Garden. He crossed a seedling no.213 of American Persimmon (female) with pollen of Asian Persimmon forms 48 and 145. A hybrid no. 18 has been grown up in vitro (laboratory conditions)and fruited in 1964 for the first time. It was named “Rosijanka”. That’s the story.”
Englands says this
" Rosseyanka Hybrid - Persimmon of exceptional quality and the large size which in near a 3 inch persimmon that ripens late and is very delicious we have been growing this selection for Approx. 20 year or so and We have never been disappointed with the crops of Luscious fruit that looks like Orange Orbs when the tree looses the leaves and the fruit remains on the trees. Reminiscent of Dio. Virginiana our native persimmons but Suitable for Zone 5 and very hardy down to about -18 degrees it is one of our favorites here our orchards."
In this thread Rosseyanka is rightly called a 50% hybrid aka F1
@stan says this "No, it does not. Rosseyanka translates as “a Russian woman” or, formally, “a female citizen of Russia”. россиянка - Wiktionary
Unfortunately, it’s common in the US plant trade to replace “difficult” foreign variety names by anglicized versions, like Russian Beauty instead of Rosseyanka or Nikita’s Gift instead of Nikitskaya Bordovaya. This often creates some confusion."
Im going to take a minute an reference this thread
Nikita’s Gift™ Hybrid Persimmon is from the Nikita Botanic Garden in Yalta, Ukraine, this unique hybrid of Asian and American Persimmon bears bountiful crops of sweet and flavorful, reddish-orange fruit followed by strikingly beautiful, orange-yellow fall foliage. Nikita’s Gift™ Hybrid Persimmon grows 10-12 ft. in height, is self-fertile and hardy to minus 10 °F.
This is an f2 hybrid NG dropped fruits the first 2 years. Nikita’s Gift is a seedling of Rossyanka X Kaki. Nikita’s Gift in my understanding is 75% kaki, and 25% virginiana. Remember its mother
Rosseyanka is 50% hybrid but now crossed back with kaki means Nikita’s Gift is 75% kaki.
@tonyOmahaz5 spoke with Jerry Lehman as shown below.
"was amazed that my NG has seeds and sought answers from Jerry Lehman.
Jerry,
I am a little puzzled why one of my Nikita’s Gift fruit had 2 seeds and I have no Asian male persimmon. The only other Asian persimmon that had fruit for the last 2 years was Ichi Kei Ki Jiro. I tested the seeds by placing them in a glass of water and they sank to the bottom and that showed me that they are viable. I placed the seeds in the frig and will plant them in pots next spring. Could NG has male flower? Thx
Hi Tony,
Nikita’s Gift (Nikitskaya Bordovaya) is a intraspecies hybrid of American X kaki. Most such hybrids produce few viable seeds. And when they do it can be by either of the hybrid’s parent’ species.
The seeds from your tree are most likely N. G. x virginiana. There is a very very remote possibility it is apomictic, but all my trees from seeds from Rosseyanka and Nikita’s Gift are very different, therefore almost assuredly back crosses to virginiana.
I have never seen any male flowers on either of my Rosseyanka or Nikitskaya Bordovaya trees.
Jerry"
See also
"Hybrid Persimmon
Interspecific hybrids of Diospyros virginiana and Diospyros kaki
Rosseyanka / Rossiyanka - First hybrid persimmon
PARENTAGE: no. 213 D.v. × form 48 or 145 D.k.
BREEDER: A.K.Pasenkov, 1958
HARDINESS: -13F
Nikita’s Gift / Nikitskaya Bordovaya
PARENTAGE: open pollinated seedling of Rosseyanka
BREEDER: Oleksandr Kazas, 1975
HARDINESS: -10F
JT-02 (Mikkusu)
PARENTAGE: Josephine D.v. x Taishu D.k.
HARDINESS: -22F
FLAVOR:
Kasandra
PARENTAGE: Great Wall D.k x Rossey 2
HARDINESS: -16F
FLAVOR: Many people report it being their favorite tasting persimmon cultivar. Brix 21
Holds fruit until picked
Ripens at the same time as JT-02
NB-02 (Zima Khurma)
PARENTAGE: Nikita's Gift × Taishu
HARDINESS:
FLAVOR:
Dar Sofiyivky / Gift of Sofiyivka - earliest hybrid
PARENTAGE: Kolhospnytsia D.k. × D.v.
HARDINESS: -20F
FLAVOR:
Gora Roman Kosh / Mount Roman Kosh
PARENTAGE: Nikita's Gift x open pollinated
HARDINESS: -8F
FLAVOR:
SOURCES: Scouring the internet + growingfruit.org/t/list-of-hybrid-persimmon-species-available-in-usa"
If Kolhospnytsia D.k. × D.v. is Dar Sofiyivky parents and N.G. is the grandparent at 75% kaki
That would make the parent 100% american x 75% kaki.
See this thread from @harbin
@JustPeachy did a good job in this post
quote=“JustPeachy, post:8, topic:40372”]
In the hybrid progeny from free pollination of the ‘Kolhospnytsia’ cultivar with the American persimmon D. virginiana in the genealogy, a new cultivar ‘Dar Sofiyivky’ has been selected. It combines increased winter hardiness with good fruit quality, early fruit production and early ripeness.
Source .
[/quote]
See this link
https://www.palomar.edu/anthro/mendel/mendel_2.htm
See this link
http://mchr.sofievka.org/article/view/219810
" Dar Sofiyivky’ as a new Ukrainian cultivar of persimmon (Diospyros L.)
Authors
- Vasyl’ Derev’ianko
- Ivan Kosenko
- Anatoly Opalko
- Nataliia Derev’ianko
DOI:
https://doi.org/10.37555/2707-3114.16.2020.219810
Keywords:
adaptation, plant hypobiosis, global warming, winter hardiness, interspecific hybridization, persimmon cultivars.
Abstract
Aim. Creation of new domestic persimmon cultivars (Diospyros spp.) adapted to the soil and climatic conditions of Ukraine will contribute to the introduction of new fruit plants into the industrial horticulture that combines high productivity and fruit quality, enriches the assortment of food products and improves the components of rational alimentation. Methods. Field studies of the persimmon species, cultivar and form collection, hybridization and station testing of hybrid seedlings have been conducted in the orchards of State Enterprise Experimental Facility “Novokakhovska” of Institute of Rice of the National Academy of Agrarian Sciences of Ukraine (Kherson region). In vitro seed germination of and two-year hybrid persimmon seedlings growth has been carried out in the Department of Genetics, Breeding and Reproductive Biology of Plants of the National Dendrological Park “Sofiyivka” of the National Academy of Sciences of Ukraine. The rest of the experiments and data statistical analysis have been done using generally accepted methods in breeding. Results. Advantages of D virginiana L. in hybridization with D. kaki Thunb. to increase the persimmon adaptability to unfavorable wintering factors have been confirmed in the extreme temperature conditions of the winters of 2005–2006 and 2011–2012. In the hybrid progeny from free pollination of the ‘Kolhospnytsia’ cultivar with the American persimmon D. virginiana in the genealogy, a new cultivar ‘Dar Sofiyivky’ has been selected. It combines increased winter hardiness with good fruit quality, early fruit production and early ripeness. In 2019, the cultivar ‘Dar Sofiyivky’ has been included in the State Register of Plant Varieties suitable for distribution in Ukraine. In vitro technologies have been used in the tissue culture laboratory of the “Sofiyivka” Dendrological Park for germination of interspecific hybrids seeds, which have insufficient germination in the field. A initial hybrid seedling has been obtained, from which the ‘Dar Sofiyivky’ genealogy is derived. Conclusions. Horticultural plant breeding, in particular persimmons (Diospyros spp.), in areas with ecologically different contrasting conditions within the framework of a single program to increase the adaptability of plants and the quality of fruits is promoted to accelerate breeding and expand the northern border cultivation of thermophilic fruit crops."
Lets review what we know and try to figure out the correct percentages.
@jrd51 the parent according to my research is Kolhospnytsia.
1.Rosseyanka = DV x DK f1 =50%
2.Nikita’s Gift = f1x DK = f2 =75%
3.Kolhospnytsia = f2×DV=f3
4.Dar Sofiyivky =f3 x dv = f4