Modern potato roots traced to lowlands of south-central Chile

Researchers at the University of Wisconsin-Madison have uncovered DNA evidence showing that 99 percent of all modern potato varieties planted today are the direct descendents of varieties that once grew in the lowlands of south-central Chile.

Washington, Jan 30 : Researchers at the University of Wisconsin-Madison have uncovered DNA evidence showing that 99 percent of all modern potato varieties planted today are the direct descendents of varieties that once grew in the lowlands of south-central Chile.

Some scientists believed that Chilean potatoes were the first to be planted in Europe, while some thought that European potatoes were originally descended from plants grown high in the Andes mountains between eastern Venezuela and northern Argentina.

This theory claims that Andean potatoes were wiped out during the Great Irish Potato Famine, the 19th-century late-blight epidemic that devastated potato fields across Europe, initiating the import of Chilean varieties to re-establish the crop.

Now, Mercedes Ames and David Spooner from the University of Wisconsin-Madison have said that both theories are wrong.

The researchers analysed the DNA of historical potato specimens and discovered that both Chilean and Andean potatoes were grown in Europe decades before and decades after the famine, the first direct evidence that the potatoes were grown simultaneously in Europe.

"Basically, we found that the Andean potatoes got to Europe first, around 1700. However, Chilean potatoes were starting to get popular there 34 years before the late blight epidemic," said Ames, a graduate student in UW-Madison's plant breeding and plant genetics program.

The findings also reveal that Andean potatoes grew as late as 1892 in Europe, proving they weren't polished off by the late blight epidemic-and that they grew side by side with Chilean potatoes for many decades before the Chilean types became dominant.

For the study, Ames visited herbaria throughout Europe in search of early potato specimens. She requested hole-punch sized samples of dried leaf tissue from appropriate specimens be sent to Madison for study, eventually ending up with material from 64 potato plants grown between 1700 and 1910.

"Some of these samples were over 300 years old and not ideally preserved. It took considerable innovation for Mercedes to work out the correct technique to get DNA from them," said Spooner, a professor of horticulture and USDA researcher who is the paper's corresponding author.

The researchers successfully extracted DNA from 49 samples and analysed each using a DNA marker that distinguishes between upland Andean and lowland Chilean potato types. The finding is a biochemical record of ancestry, which Spooner said adds hard evidence to a debate often premised on guesswork.

"The problem with these two theories is that they rely on inferences based on the morphology of old plant samples, as well as inferences based on historical records about day-length adaptation, shipping routes, and the role of the late blight epidemic," he said.

"Our work is the first direct evidence-as opposed to the inferential evidence used in prior studies-on the origin of the European potato because the herbarium specimens we used are like fossils," he added.

The study is published in the American Journal of Botany.

ANI