Corrigendum: Indole-3-Acetic Acid Produced by Burkholderia heleia Acts as a Phenylacetic Acid Antagonist to Disrupt Tropolone Biosynthesis in Burkholderia plantarii

In this Article, the compound '(R)-(–)-2-phenylpropionic acid' was incorrectly given as '(R)-(–)-2-methylphenylpropionic acid'. In the Results section under subheading 'Interference of the tropolone biosyn-thetic pathway of B. plantarii by PAA analogues' , " Among the PAA analogues tested, p-tolylacetic acid, (R)-(–)-2-methylphenylpropionic acid, and (p-isopropylphenyl)acetic acid inhibited tropolone production as effectively as IAA at the same concentration (Figure 6). " should read: " Among the PAA analogues tested, p-tolylacetic acid, '(R)-(–)-2-phenylpropionic acid, and (p-isopropylphenyl) acetic acid inhibited tropolone production as effectively as IAA at the same concentration (Figure 6). " The correct Figure 6 and its accompanying legend appear below as Figure 1. Eight compounds, i.e., 3-pyridylacetic acid HCl (A), 4-hydroxyphenylacetic acid (B), 1-imidazoleacetic acid (C), p-tolylacetic acid (D), (p-isopropylphenyl)acetic acid (E), (R)-(–)-2-phenylpropionic acid (F), (±)-2-phenylbutyric acid (G), and (S)-(–)-3-phenyllactic acid (H), along with indole-3-acetic acid (IAA) (I) as positive control, were tested on B. plantarii-impregnated gellan plates, in which Winogradsky's mineral mixture supplemented with 50 g L −1 sucrose, 500 mg L −1 yeast extract, and 0.1 mM Fe 2 (SO 4) 3 was solidified with 10 g L −1 gellan gum. An MeOH solution of each test compound prepared at 0.1, 1, 10, and 100 mM was loaded on a paper disk for the assay, and the absolute amount of the test compound on each paper disc is shown in a sub-table in the panel. The sub-number shows the absolute amount of the compound loaded (e.g. A2 is 3-pyridylacetic acid ·HCl at 100 nmol). CT is the control (MeOH only). Red arrows on the plate photograph indicate tropolone inhibition zone.