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Unformatted text preview: or a few parent trees. Many flowering plants develop as parasites on other plants. They produce adventitious roots called haustoria that penetrate the tissues of the host and connect to the vascular system, thus becoming part of the host pipelines. Parasitic roots lack most of the tissues of ordinary roots. Dodder and mistletoe are two of the more than 3000 flowering plant parasites. Mycorrhizal roots are known from 90 percent of plant species and are a mutualistic association of a fungus with plant root tissue. Most plants require specific mycorrhizal fungi without which they are unable to absorb sufficient quantities of P, Zn, and Mn. The fungus takes the place of root hairs and may penetrate the cortex completely ( endomycorrhizae ) or remain on the surface of the root ( ectomycorrhizae )....
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This note was uploaded on 11/14/2011 for the course BIO 1421 taught by Professor Farr during the Fall '08 term at Texas State.
- Fall '08