The Potato's Second Genesis
While the potato was first domesticated thousands of years ago near Lake Titicaca in the Andes, the Chiloé Archipelago is the genetic origin point for over 90% of the potatoes grown globally today. This is because the world's most common potato subspecies, Solanum tuberosum ssp. tuberosum, is indigenous to this specific island environment. Unlike their Andean ancestors (S. tuberosum ssp. andigena), which were adapted to short daylight hours, the Chilote potatoes evolved to form tubers during the long summer days found at higher latitudes. This adaptation made them perfectly suited for agriculture in Europe and North America.
After the European potato failure in the 1840s, caused by a blight that devastated genetically uniform crops, strains from Chiloé were introduced and quickly replaced the older Andean-derived varieties. The island’s isolation and the dedicated farming practices of its inhabitants created a secondary center of genetic diversification for the tuber. Historically, local farmers cultivated between 800 and 1,000 distinct potato varieties. Today, conservation efforts have registered 286 of these unique landraces, safeguarding a genetic library that is essential for global food security.