Figure 2. AtOPR3 negatively mediates primary root growth via inhibiting longitudinal growth of the root tip.

(a–d) Scan electron microscopy analysis of root tip length in WT and Atopr3 mutant plants under the whole nutrient (Control) or low P (-P) treatment. (e) Statistical analysis of root tip length between WT and Atopr3 mutant plants. Results were presented as means (n = 10) with error bars (standard deviation), and asterisks indicated significant differences as determined by a t-test analysis (**P < 0.01).