A Mutualistic Root Ecosystem article - botany, plant physiology (Jan/14/2008 )

The rhizosphere is a very thin line of 'mucus' seen in plant roots containing bacteria and fungal hyphae mixed in a soup of root excretions containing nutrients for the beneficial microorganisms. The bacteria and fungi give the plant other nutrients (like nitrogen) and protection from infection (viruses and nematodes) in exchange for plant nutrients. Here's an article that discusses this:
http://www.findingfacts.com/content/view/43/2/

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