@Arhus76
Nowhere in any publication has anyone proven anything about persimmon astringent genes – it is all speculation based on analog chemistry. Consequently no one in this thread including you and @jrd51 should be discussing astringent genes – only astringent traits.
I’ll further point out out that neither of you have a clear idea of what a gene is, and thus that word should not appear in any of your discussions. I can go on to show that many published horticultural researchers do not either and thus you should not feel isolated in that category.