Frozen Antarctic moss revived after 1,500 years

Scientists have successfully revived moss lying frozen under the Antarctic ice for more than 1,500 years.
This is the first study to show such long-term survival in any plant; similar timescales have only been seen before in bacteria, researchers said.
Researchers from the British Antarctic Survey and Reading University observed moss regeneration after at least 1,530 years frozen in permafrost.
Mosses are known to survive environmental extremes in the short-term with previous evidence confirming up to a 20 year timescale for survival. Their potential to survive much longer timescales had not previously been examined.
Mosses are an important part of the biology of both polar regions. They are the dominant plants over large areas and are a major storer of fixed carbon, especially in the north.

"What mosses do in the ecosystem is far more important than we would generally realise when we look at a moss on a wall here for instance," said co-author Professor Peter Convey from the British Antarctic Survey.

"Understanding what controls their growth and distribution, particularly in a fast-changing part of the world such as the Antarctic Peninsula region, is therefore of much wider significance," Convey said.
The team took cores of moss from deep in a frozen moss bank in the Antarctic. This moss would already have been at least decades old when it was first frozen.
They sliced the frozen moss cores very carefully, keeping them free from contamination, and placed them in an incubator at a normal growth temperature and light level.

After only a few weeks, the moss began to grow. Using carbon dating, the team identified the moss to be at least 1,530 years of age, and possibly even older, at the depth where the new growth was seen.
"This experiment shows that multi-cellular organisms, plants in this case, can survive over far longer timescales than previously thought," Convey said.
"These mosses, a key part of the ecosystem, could survive century to millennial periods of ice advance, such as the Little Ice Age in Europe.
"If they can survive in this way, then recolonisation following an ice age, once the ice retreats, would be a lot easier than migrating trans-oceanic distances from warmer regions," he said.

"It also maintains diversity in an area that would otherwise be wiped clean of life by the ice advance.
"Although it would be a big jump from the current finding, this does raise the possibility of complex life forms surviving even longer periods once encased in permafrost or ice," Convey added.
The study is published in the journal Current Biology.