Light micrographs of samples from date palm root tissues infected by Fusarium oxysporum f. sp. albedinis (Foa). A: control roots (20). B: 8 days after inoculation, with the
fungus; note that all parts of the root have been invaded. Plasmolysis is visible throughout the cortex (20). C: General view of a root 2 weeks after inoculation, the cortical tissues
and the phloem were hydrolyzed, xylem was more resistant to degradation (40). Xyl: xylem vessels, Phl: Phloem tubes, PC: parencymatous cells, Phc: Phenolic-storing cells