Extended Data Table 1 In vivo concentration of indole derivatives as reported in plant extracts. See refs. <sup><a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 21" title="Katz, E. et al. The glucosinolate breakdown product indole-3-carbinol acts as an auxin antagonist in roots of Arabidopsis thaliana. Plant J. 82, 547–555 (2015)." href="/articles/s41586-021-03425-2#ref-CR21" id="ref-link-section-d446077623e2025">21</a>,<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" title="Novák, O. et al. Tissue-specific profiling of the Arabidopsis thaliana auxin metabolome. Plant J. 72, 523–536 (2012)." href="#ref-CR45" id="ref-link-section-d446077623e2028">45</a>,<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" title="Tam, Y. Y., Epstein, E. & Normanly, J. Characterization of auxin conjugates in Arabidopsis. Low steady-state levels of indole-3-acetyl-aspartate, indole-3-acetyl-glutamate, and indole-3-acetyl-glucose. Plant Physiol. 123, 589–596 (2000)." href="#ref-CR46" id="ref-link-section-d446077623e2028_1">46</a>,<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" title="Mashiguchi, K. et al. The main auxin biosynthesis pathway in Arabidopsis. Proc. Natl Acad. Sci. USA 108, 18512–18517 (2011)." href="#ref-CR47" id="ref-link-section-d446077623e2028_2">47</a>,<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" title="Normanly, J., Cohen, J. D. & Fink, G. R. Arabidopsis thaliana auxotrophs reveal a tryptophan-independent biosynthetic pathway for indole-3-acetic acid. Proc. Natl Acad. Sci. USA 90, 10355–10359 (1993)." href="#ref-CR48" id="ref-link-section-d446077623e2028_3">48</a>,<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 49" title="Böttcher, C. et al. The biosynthetic pathway of indole-3-carbaldehyde and indole-3-carboxylic acid derivatives in Arabidopsis. Plant Physiol. 165, 841–853 (2014)." href="/articles/s41586-021-03425-2#ref-CR49" id="ref-link-section-d446077623e2031">49</a></sup>