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Major volatile compounds of roots of Piper nigrum L. (CONTROL) after inoculation with Fusarium solani f. sp. piperis (FUS) and co-inoculation with arbuscular mycorrhizal fungi and F. solani f. sp. piperis (AMF + FUS). (a) β-caryophyllene; (b) δ-elemene; (c) limonene.
