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Fractionation of fescue root exudates. (A) F. rubra rubra cv. Intrigue roots. The slight yellowish discoloration near the root tips (arrows) indicates accumulation of root exudates on actively growing roots. (B) Activity-guided fraction of cv. Intrigue root exudates. Fractions are classified as strongly active (**), slightly active (*), and not active (
) in our filter paper phytotoxicity assay (7).
