Morphotype amFE ("fine endophyte")
distribution in root cortex
usually outer cell layers
auxiliary cells
absent, but sometimes extraradical vesicle-like structures seen
hyphae at entry point
somewhat coiled, often typical, crest-like structures develop, vesicles usually formed here
intraradical hyphae
very thin (1 - 2 um diameter), usually run several hyphae together, more or less in the longitudinal direction
arbuscules
these are prominent particularly for one of the subtypes
vesicles
small (around 7 um length), usually just near entry point

Here are at least two subtypes involved: the "classical" fine endophyte, as represented by the following three images:


Above, we can see a typical startup of fine endophyte colony. FE AMM develops vesicle-like structures within (or outside) the root very soon, compared with the other AM types.

 
Here we can see a very rich infection by FE morphotype. This infection level is not typical, usually the FE type represents just a subordinate population to the other, more abundant types (like amG1 or amSc)


Arbuscular fungi are know to often use the root hair pathway to enter the roots. Here, we can even see the FE morphotype to develop the vesicles within the root hair cell.
 

The other type of the FE morphotype is the "fine Glomus" type with prominent distinct type of arbuscules and no vesicles:

The colonies on this and following image are mixed with other type with thicker, septate hyphae.


 

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This page last modified by Petr Šmilauer on 14 September 2000