Fig. 5

Dynamic response of root parameters in contrasting NT DH lines. Each point represents the observed value after 7 days of seedling growth for six tolerant and six susceptible selected lines. The dynamic curves of total root length and root tips were simulated by Hill 3 parameters and Peak LogNormal model 3 parameters, respectively; for root diameter and root volume, the four parameters and three Sigmoid parameters are adopted, respectively. All fitting coefficients are higher than 0.98. Blue and red colors refer to salt-tolerant and susceptible groups, respectively. *^,**Significant differences between tolerant and susceptible groups at p < 0.05 and p < 0.001, respectively (t test). Letters represent significant differences between different salt treatments at p < 0.05 (Tukey HSD)