Which came first: the people or the sweet potatoes?

TAMPA: The bulbous, colorful sweet potato has long been seen as an artifact of mankind´s first ocean voyages, ferried from its home in South America all the way to Polynesia centuries ago.

But a controversial new study Thursday questions that assumption, using the most extensive genetic analysis yet to suggest that the sweet potato was widespread on Earth long before humans came into the picture.

Researchers at the University of Oxford say their findings show that sweet potatoes (Ipomoea batatas) originated in South America some 800,000 years ago, and that the plant likely made its way to the Pacific island simply by seeds traveling on the wind.

“We show there is no need to invoke human-mediated transport,” co-author Tom Carruthers, a PhD student at the University of Oxford, told AFP. “Sweet potato evolved before humans so the origin of sweet potato hasn´t got anything to do with humans.”