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. 2019 Oct 18;15(10):e1008465. doi: 10.1371/journal.pgen.1008465

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© 2019 Xu, Cai

This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

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Fig 10 — Temporal control of the lateral root emergence (LRE) gene regulatory network involving OBP4 and XTH9. Auxin is perceived by AFB3 and triggers the degradation of IAA14, which releases ARF7/19. Auxin regulates XTH9 expression in an ARF7/19-dependent manner. XTH9 is also negatively regulated by OBP4, which fine-tunes the XTH9 expression level in response to environmental nitrate availability. This synergistic regulation of OBP4-XTH9 has a specific function in lateral root (LR) development in response to nitrate signaling in Arabidopsis.