Top le a root heavily colonised by am fungi with

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Unformatted text preview: Main site of nutrient exchange between fungus and cell root –  Remain alive for short period of 8me –  Degenerated and replaced Fig. 13.1. The principal features of arbuscular mycorrhizal (AM) fungi, observed by clearing the root 8ssues with strong alkali and then staining roots with the fungal dye, trypan blue. Top le>: A root heavily colonised by AM fungi, with hyphae that radiate into the soil. Top right: When observed through the depth of the root cortex, AM fungal hyphae are o^en seen to run parallel to the root axis, growing between the root cor8cal cells. These hyphae are irregular, with constric8ons and bulges, quite unlike the hyphae of most other fungi. They frequently produce large, swollen vesicles within the root 8ssues. BoBom le>: some of the external hyphae and hyphal aggregates produce clusters of spores in the soil. BoBom right: Some of the root cor8cal cells are penetrated by hyphae that branch repeatedly to produce intricately branched arbuscules, o^en completely filling the root cells. [� Jim Deacon] Arbuscular Mycorrhiza (AM) •  Spores –  Large, up to 400 um –  Germinate and infect the roots •  From an appressorium ­like infec8on structure on the root surface Arbuscular Mycorrhiza (AM) Arbuscular Mycorrhiza (AM) •  Ecological Significance of...
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This document was uploaded on 03/02/2014 for the course BIOL 4848 at Youngstown State University.

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