Here is a link

https://www.intechopen.com/books/breeding-and-health-benefits-of-fruit-and-nut-crops/genetic-diversity-and-breeding-of-persimmonIn the genus Diospyros, there are species and varieties having diploid (2n = 2x = 30), tetraploid (2n = 4x = 60), hexaploid (2n = 6x = 90), nonaploid (2n = 9x =135) and dodecaploid (2n = 12x = 180) chromosome number. Therefore, it is thought that the basic chromosome number of the genus Diospyros is 15 [9, 12]. The chromosome numbers of some wild species of genus Diospyros (D. oleifera, D. glandulosa, D. confertiflora, D. discolorare, D. ehretioides, D. lycioides, D. mollis, D. rhodocalyx and D. sumatrana) are 2n = 30, except for 2n = 60 for D. rhombifolia and 2n = 90 for D. ebenum [13, 14, 15]. D. kaki L. is a hexaploid (2n = 6x = 90). However, octoploid (2n = 8x = 120) cultivars such as Hasshu and nonaploid (2n = 9x =135) cultivars such as ‘Hiratanenashi’ and ‘Tonewase’ have also been reported [14, 15, 16]. On the other hand, D. virginiana has two karyotypes with 2n = 60 and 90 [15, 17], while D. lotus is diploid (2n = 2x =30) [14].

I think it would be interesting to take a Florida Persimmon Breed it with a early type (kentucky 60 type),

and see if your native types would be early since we get alot less sun.