Figure 1.

Two-way phenotypic dendrogram showing three clusters for variation in salt tolerance among 162 rice accessions including 123 URMC accessions. Four early vigor traits associated with salt stress tolerance at the seedling stage were used for constructing the dendrogram and are denoted by numbers: 1: SSI score d16; 2: Δ PHT d16; 3: Δ green leaf#; and 4: Total biomass plant⁻¹ on the x-axis of the heatmap. The blue color illustrates low values, while the red color illustrates high values for the measured trait.