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Almost 22,000 Years Ago, Humans Began Consuming Grapes

by Bidita Debnath on November 4, 2017 at 11:51 PM
 Almost 22,000 Years Ago, Humans Began Consuming Grapes

Humans started consuming grapes - a fruit that today brings joy to millions of wine drinkers around the world - nearly 22,000 years ago when the ice sheets covering much of North America and Europe began retreating, finds a genomic study.

The study found evidence that people may have been eating the popular fruit as many as 15,000 years before they domesticated the fruit as an agricultural crop.

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"Like most plants, grapes are typically considered to have been cultivated around 7,000 to 10,000 years ago, but our work suggests that human involvement with grapes may precede these dates," said Brandon Gaut, evolutionary biologist and Professor at the University of California - Irvine.

"The data indicate that humans gathered grapes in the wild for centuries before cultivating them. If we are right, it adds to a small but growing set of examples that humans had big effects on ecosystems prior to the onset of organised agriculture," he said.
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For the study, appearing in the Proceedings of the National Academies of Sciences, the team compared the sequenced genomes of wild and domesticated Eurasian grapes.

The scientists found that populations of the fruit steadily decreased until the period of domestication, when grapes began to be grown and harvested for wine.

The long decline could reflect unknown natural processes, or it may mean that humans began managing natural populations long before they were actually domesticated, the researchers said.

The altering of several important genes -- involved in sex determination and others related primarily to the production of sugar -- during domestication was a key turning point for the fruit.

These changes helped define grapes and probably contributed to the spreading of the crop throughout the ancient world, Gaut noted.

In addition, the modern grape genomes contained more potentially harmful mutations than did the fruit's wild ancestors.

These accumulate due to clonal propagation, which is reproduction by multiplication of genetically identical copies of individual plants, the researchers said.

Source: IANS
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