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Hungry microbes share out the carbon in the roots of plants
Date:10/18/2007

so it was possible to identify the microbes that made those heavy molecules. These were the greedy ones that were consuming the largest share of the sugars provided by the plant.

Professor Young said: There are rich communities of microbes growing in or around the roots of all plants growing in normal soil. Most do no harm to the plant, and some are very beneficial to it. We looked at two sorts of microbe: bacteria and mycorrhizal fungi.

The researchers found a high diversity of both types of microbe inside the roots of grass or clover plants growing in a pasture, but the heavy label revealed that some of these were growing much more actively than others.

Professor Young added: It is these active organisms that are important because they are turning sugar back into carbon dioxide, which is released into the atmosphere. We were astonished at the wide variety of active bacteria that we discovered. Many of them had not been seen in plant roots before, and we have no idea how they may affect plant growth.

The role of mycorrhizal fungi is better known. They are particularly important in carbon cycling, because they pump the carbon compounds out of the root into a massive network of fine fungal filaments in the soil, where it becomes available to other microbes and also to larger soil organisms like worms, mites and insects. In return, the fungus gathers phosphorus from the soil and delivers it to the plant, helping the plant to grow better. The research confirmed that there were many different fungi in the roots of each plant, but revealed, for the first time, which of these fungi were most active.


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Contact: David Garner
dcg501@york.ac.uk
44-019-044-32153
University of York
Source:Eurekalert

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