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258<br />

Giang Huong Pham et al.<br />

Fig. 16a–e. Interaction with Arabidopsis thaliana. a SEM picture of hyphae closely<br />

attached to the root <strong>surface</strong>. Besides normal hyphae (arrowhead) P. indica also forms<br />

coralloid hyphae (arrow) and chlamydospores (asterisk, collapsed due to preparation);<br />

b SEM picture of a hypha probably forming an appressorial swelling (arrow), which has<br />

caused an imprint (arrowhead) on the <strong>surface</strong> of a rhizodermal cell; c epifluorescence<br />

LM-picture of a hypha entering a root hair (arrow). Staining: aniline blue; d root stained<br />

with cotton blue shows intracellular chlamydospores in the rhizodermis (arrows); e a<br />

segment of the root stained with FDA and observed in epifluorescence showing lower<br />

FDA-fluorescence (arrowhead) than adjacent regions, indicating less vitality. In bright<br />

field it was clearly visible that this region was covered with hyphae (arrow chlamydospore)

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