Thursday April 26, 2018
Home Science & Technology Oxford Univer...

Oxford University Scientists have discovered 320 million year-old fossil containing oldest plant root cell

The fossils studied during the research are the remains of the soil from the first giant tropical rainforests on Earth

0
//
93
Scientists in laboratory Image source: Wikimedia commons
Republish
Reprint

Oxford University Herbaria has found in a fossilized root tip, the cells which gave rise to the roots of an ancient plant. The researchers also found, it is the first ever actively growing fossilized root i.e an ancient plant frozen in time. The study is published in the journal Current Biology.

Follow NewsGram at Twitter: @newsgram1

‘I was examining one of the fossilised soil slides held at the University Herbaria as part of my research into the rooting systems of ancient trees when I noticed a structure that looked like the living root tips we see in plants today. I began to realize that I was looking at a population of 320 million-year-old plant stem cells preserved as they were growing — and that it was the first time anything like this had ever been found. It gives us a unique window into how roots developed hundreds of millions of years ago.’ Oxford Plant Sciences PhD student Alexander (Sandy) Hetherington, who made the discovery during the course of his research, said.

800px-03-09_Mnium1
Plant cells. Image source: Wikimedia

These stem cells are located in the meristems (in plants at the tips of roots and shoots) of multicellular organisms. These stem cells are renewing cells which form these organisms. The 320 million-year-old stem cells discovered are different to all those living today, with a unique pattern of cell division that remained unknown until now. That tells us that some of the mechanisms controlling root formation in plants and trees have now become extinct and may have been more diverse than thought.

These roots were important because they comprised the rooting structures of the plants growing in Earth’s first global tropical wetland forests with tall trees over 50m in height and were in part responsible for one of the most dramatic climate change events in history. The evolution of deep rooting systems increased the rate of chemical weathering of silicate minerals in rocks — a chemical reaction that pulled CO2 out of the atmosphere, leading to the cooling of Earth and thus one of the planet’s great ice ages.

Follow NewsGram at Facebook: NewsGram

The fossils studied during this research are the remains of the soil from the first giant tropical rainforests on Earth. The rock in which the soil is preserved formed in the Carboniferous swamps that gave rise to the coal sources spanning what is now Appalachia to central Europe, including the coal fields in Wales, northern England and Scotland.

Sandy has named the stem-cell fossil Radix carbonica (Latin for ‘coal root’).

‘These fossils demonstrate how the roots of these ancient plants grew for the first time. It is startling that something so small could have had such a dramatic effect on Earth’s climate. This discovery also shows the importance of collections such as the Oxford University Herbaria — they are so valuable, and we need to maintain them for future generations.’ says Professor Liam Dolan, Head of the Department of Plant Sciences at Oxford University and senior author of the paper.

-by Vrushali Mahajan, an intern at NewsGram. Twitter @Vrushali Mahajan 

ALSO READ:

Click here for reuse options!
Copyright 2016 NewsGram

Next Story

STUDY: Lakes on Mars dried up 3.5bn years ago

A study reveals that lakes on Mars dried up 3.5bn years ago.

0
//
17
An image of Mars.
Mars. Pixabay

The discovery of cracks on the surface of Mars by NASA’s Curiosity rover in early 2017 are evidence of lakes that likely dried up 3.5 billion years ago, confirmed a study, revealing details about the red planet’s ancient climate.

In early 2017 scientists announced the discovery of possible desiccation cracks in Gale Crater, which was filled by lakes 3.5 billion years ago.

“We are now confident that these are mudcracks,” said lead author Nathaniel Stein, a geologist at the California Institute of Technology in Pasadena, US.

Since desiccation mudcracks form only where wet sediment is exposed to air, their position closer to the centre of the lake bed rather than the edge also suggests that lake levels rose and fell dramatically over time.

“The mudcracks show that the lakes in Gale Crater had gone through the same type of cycles that we see on Earth,” Stein added.

Representational image for planet Mars.
Representational image. Pixabay

Although scientists have known almost since the moment Curiosity landed in 2012 that Gale Crater once contained lakes, “the mudcracks are exciting because they add context to our understanding of this ancient lacustrine system”, Stein explained, in the paper published in the journal Geology.

“We are capturing a moment in time. This research is just a chapter in a story that Curiosity has been building since the beginning of its mission,” he said.

Also Read: SpaceX to build Mars rockets in Los Angeles

For the study, the team focused on a coffee table-sized slab of rock nicknamed “Old Soaker”.

Old Soaker is crisscrossed with polygons identical in appearance to desiccation features on Earth.

They found that the polygons — confined to a single layer of rock and with sediment filling the cracks between them — formed from exposure to air, rather than other mechanisms such as thermal or hydraulic fracturing, the researchers said.  IANS