The researchers were also able to group Spaniards into five genetic clusters. On a map, these groups form five strips running north to south. Those strips line up neatly with history.
I wonder if you’d get a similar pattern looking at crops, say wheat. There’s lots of material in genebanks to play around with.
LATER: Thanks to David Marshall for pointing out that work has been done on barley.
It just needs someone to compare the patterns now. And repeat for other crops.
It’s been looked at for barley. Nice work
https://www.researchgate.net/profile/Yahiaoui_Samia/publication/5820027_Patterns_of_genetic_and_eco-geographical_diversity_in_Spanish_barleys/links/0912f50f6b7df15fb8000000/Patterns-of-genetic-and-eco-geographical-diversity-in-Spanish-barleys.pdf?origin=publication_detail
In Spain, the current linguistic pattern is mainly the result of the Reconquista. I would expect almost no connection between languages and crop diversity patterns in this case as there was quite some demographic continuity even when rulers and languages changed.