Rhizobium and Mycorrhizal Symbiosis

Added by | 10 yearss ago


In class we learned about two types of root symbiosis. In the first, Mycorrhizal symbiosis, fungi surrounds the root hairs of plants. This increases the surface area of the root hairs and allows it to better absorb nutrients in the soil. It also provides the plant roots with protection. In exchange the fungi -attached to the root hairs- gets glucose from the plant. In this type of symbiosis, the plant is able to absorb more nutrients from the soil, and the Fungi get glucose from the plant. 90% of all plants have a Mycorrhizal relationship. The other type of root symbiosis we learned about was Rhizobium symbiosis. This type of symbiosis occurs in legumes. Here, nodules containing the bacteria rhizobium attach themselves to root hairs of the legume. The rhizobuim absorbs and converts unusable nitrogen in the soil, to biologically usable nitrogen; which is then used by the legume. The root of the legume supplies the rhizobium with glucose obtained photosynthetic parts of the plant. So, in this symbiosis, the planet gets usable nitrogen it otherwise would not have had, and the rhizobuim gets glucose from photosynthesis (a process it can not perform).


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