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Phenylalanine ammonia-lyase enzyme activity in Piper nigrum L. (CONTROL), inoculated with Fusarium solani f. sp. piperis (FUS) and co-inoculated with arbuscular mycorrhizal fungi and F. solani (AMF + FUS). (a) leaves; (b) roots. Different letters varied statistically by Tukey’s test (p < 0.05).
