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. 2021 Mar 31;12:660870. doi: 10.3389/fpls.2021.660870

FIGURE 6.

FIGURE 6

Simplified model of integration of shoot-perceived low R:FR and low nitrate availability on lateral root development. WL + FR enhances HY5 expression, stabilization and transport. In normal nitrate conditions this leads to reduced lateral root development, both due to direct effect of HY5 on emergence, but also due to repression of NRT2.1, which has a positive effect on lateral root development. When nitrate availability is low, both HY5 expression and NRT2.1 expression is enhanced, which results in further repression of lateral root development through HY5. Ammonium, possibly via NRT1.1, bypasses low R:FR signaling through its direct effect on lateral root development and also via its repression of NRT2.1 induction.