Study on Potato: Recently, a study published in Cell revealed that the modern potato evolved from an unexpected hybridization between a wild tomato and a potato-like plant known as Etuberosum, approximately 9 million years ago.
o Tuber Evolution: Neither tomatoes nor Etuberosums originally had tubers. The hybrid plant gained the ability to form tubers, allowing it to store nutrients underground — a key survival adaptation in the cold Andean environment.
o Key Genes Identified: Tomato contributed the SP6A "master switch" gene, signaling tuber formation.
ü Etuberosum contributed the IT1 gene, controlling underground stem growth.
ü Both genes had to function together for tubers to develop — a chance genetic combination.
o This contradiction was resolved through phylogenetic analysis and genome sequencing of 450 wild and cultivated species.
o The study used the most comprehensive collection of wild potato genomic data ever analyzed, including rare specimens from isolated Andean valleys.
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