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RBG1 promotes the initiation and elongation of crown roots that correlates with the increase in endogenous auxin levels. (a) IAA levels in embryos and coleoptiles at 2 DAI. (b) IAA levels in stems at 37 DAI. (c) Seedlings of WT, RBG1Act and two RBG1‐Ox lines grown in ½ MS medium for 4 and 5 DAI. Arrows indicate the same seminal roots at 4 and 5 DAI. SR: presence (+) or absence (−) of seminal roots; CR: slow, moderate or fast growth speed of crown roots.
