EnvThes
[controlled by ] U Grandin, 2013-08-22" , "[source of definition ] http://en.wikipedia.org/wiki/Root, 2013-08-22
US LTER controlled vocabulary
Primary roots usually lt 2 mm diameter that have the function of water and nutrient uptake. They are often heavily branched and support mycorrhizas. These roots may be short lived, but are replaced by the plant in an ongoing process of root 'turnover'
part of organism
fine root