RACK1A positively regulates opening of the apical hook in <i>Arabidopsis thaliana</i> via suppression of its auxin response gradient.

We calculated the hook opening rates during this phase (from the maximum mean hook angle to the first mean hook angle below 30% of the maximum) as the slope angles of the kinematic curves and performed statistical comparisons, revealing a highly significant deceleration of the early hook opening rate in the DAPIA-treated compared to the mock-treated WT ( Fig. 1 D ).

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