>
> Actually, quite a number of plants are believed to have become polyploidy
> (doubling or more than doubling the number of sets of their chromosomes)
> entirely on their own in nature--i.e., without any intervention from
humans.
> Wheat, blueberries, and apples are ones that jump to mind.

without intentional intervention surelly , but the living conditions offered
to those plants ( all domestics in monoculture ?) will have conditionned
those plants to mute . It will be interesting to know what is this  about .
Do you know any wild plants who started to split their chromosoms .?

jean-claude