A team of scientists led bu Dr.Pierre-Marc has solved a long-running mystery about the first stages of plant life on earth.
The team of scientists from the John Innes Centre - Madison and other international collaborators, has discovered how an ancient alga was able to inhabit land, before it went on to evolve into the world's first plant and colonise the earth.
Up untill now it had been assumed that the alga evolved the capability to source essential nutrients for its survival after it arrived on land by forming a close association with a beneficial fungi called 'arbuscular mycorrhiza [AM]', which helps plant roots obtain nutrient and water from soil in exchange for carbon. The previous discovery of 450 miilion years old fossiled spores similar to the spores of AM fungi suggests this fungi would have been present in the environment encountered by the first land plants. Remnants of prehistoric fungi have also been found inside the cells of the oldest plant macro-fossils, reinforcing this idea. However, scientsists were not clear how the algal ancestor of land plants could have survived long enough to mediate a qiud pro quo arrangement with fungi. This new finding points to the alga developing this crucial capability while still living in the earth's oceans!
Dr.Delaux and colleages analysed DNA and RNA of some of the earliest known land plants and green algae and found evidence that thier shared algl=al ancestor living in the earth's waters already possessed the set of genes. or symbiotic pathways, it needed to detect and interact with the beneficial AM fungi.
The team of scientists believes this capability was pivotal in enabling the alga to survive out of the water and to colonise the erath. By working with the fungi to find sustanance. the alga was able to by time to adapt and evolve in a very different and seemingly infertile environment.
He saids; ''At some point 450 million years ago, alga from the earth's water plashed up on to barren land. Somehow it survived and took root, a watershed moment that kick-started the evolution of life on earth. Our discovery shows for the first time that the alga already knew how to survive on land while it was still in the water. Without the development of this pre-adapted capability on alga, the earth could be a very different place today.
This finding has filled a gap in our collective knowledge about the origins of life on earth. None of this would have been possible without the delication of a world-wide team of scientists including a tremandous contribution from the 1KP initiative led by Gane KS Wong.''
Prof.Jean from wisconsin said; ''The surprise was finding the mechanisms in algae which allow plants to interad with symbiotic fingi. Nobody has studied beneficial associations in these algae.''
This research was funded by the Biotechnilogy and Biological sciences Research Council[BBSRC] and the us based National Science Federation.
A team of scientists led bu Dr.Pierre-Marc has solved a long-running mystery about the first stages of plant life on earth.The team of scientists from the John Innes Centre - Madison and other international collaborators, has discovered how an ancient alga was able to inhabit land, before it went on to evolve into the world's first plant and colonise the earth.Up untill now it had been assumed that the alga evolved the capability to source essential nutrients for its survival after it arrived on land by forming a close association with a beneficial fungi called 'arbuscular mycorrhiza [AM]', which helps plant roots obtain nutrient and water from soil in exchange for carbon. The previous discovery of 450 miilion years old fossiled spores similar to the spores of AM fungi suggests this fungi would have been present in the environment encountered by the first land plants. Remnants of prehistoric fungi have also been found inside the cells of the oldest plant macro-fossils, reinforcing this idea. However, scientsists were not clear how the algal ancestor of land plants could have survived long enough to mediate a qiud pro quo arrangement with fungi. This new finding points to the alga developing this crucial capability while still living in the earth's oceans!Dr.Delaux and colleages analysed DNA and RNA of some of the earliest known land plants and green algae and found evidence that thier shared algl=al ancestor living in the earth's waters already possessed the set of genes. or symbiotic pathways, it needed to detect and interact with the beneficial AM fungi.The team of scientists believes this capability was pivotal in enabling the alga to survive out of the water and to colonise the erath. By working with the fungi to find sustanance. the alga was able to by time to adapt and evolve in a very different and seemingly infertile environment.He saids; ''At some point 450 million years ago, alga from the earth's water plashed up on to barren land. Somehow it survived and took root, a watershed moment that kick-started the evolution of life on earth. Our discovery shows for the first time that the alga already knew how to survive on land while it was still in the water. Without the development of this pre-adapted capability on alga, the earth could be a very different place today. This finding has filled a gap in our collective knowledge about the origins of life on earth. None of this would have been possible without the delication of a world-wide team of scientists including a tremandous contribution from the 1KP initiative led by Gane KS Wong.''Prof.Jean from wisconsin said; ''The surprise was finding the mechanisms in algae which allow plants to interad with symbiotic fingi. Nobody has studied beneficial associations in these algae.''This research was funded by the Biotechnilogy and Biological sciences Research Council[BBSRC] and the us based National Science Federation.
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