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. 2020 Sep 2;25(17):4003. doi: 10.3390/molecules25174003

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© 2020 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Leaf immersion assay. Phytotoxic damage of α-acetylorcinol (1) and p-hydroxybenzoic acid (2) on leaves excised from parsnip (P. sativa) and parsley (P. crispum) plants: (a) p-hydroxybenzoic acid (7.25 mM), (b) p-hydroxybenzoic acid (14.5 mM), (c) p-hydroxybenzoic acid (22.0 mM), (d) α-acetylorcinol (22.0 mM), (e) p-hydroxybenzoic acid (14.5 mM), (f) p-hydroxybenzoic acid (22.0 mM), and (g) α-acetylorcinol (22.0 mM). The sterile uninoculated medium was used as a control. The circle indicates the phytotoxic effect.