Symbiotic Relationships

Symbiotic Relationships - Symbiotic Relationships :...

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Symbiotic Relationships Two important symbioses involve fungi: the mycorrhizae that occur on the roots of almost all vascular  plants and the lichens that have evolved entirely different body forms from those of their symbionts. Mycorrhizae Fungi and the roots of almost all vascular plants form mutualistic associations called  mycorrhizae  (singular, mycorrhiza). The fungus gets its energy from the plant, and the plant acquires an efficient  nutrient absorbing mechanism—the actively growing hyphae that penetrate regions of the soil  untapped by root hairs. Phosphate uptake especially is increased when mycorrhizae are present.  Two general types of mycorrhizae occur, differentiated by whether the hyphae live  within  the cortical  cells of the roots or remain  outside  the cells:  endomycorrhizae  (endo = within; myco = fungus;  rhizae = roots) and  ectomycorrhizae  (ecto = outside). Zygomycete taxa are components of most 
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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.

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