Fig. 2.

Root plasticity variation within an accession (Col-0) spans a range of plasticity exhibited by Arabidopsis natural variants and maps to regions in chromosome III and IV. (A and B) Bars indicate SE. Red bars, Col-0 in the five treatments IAA, CK, ABA, KNO₃, and NH₄Cl and a KCl control (n = 20); gray bars, phenotypes of 69 Arabidopsis accessions grown under a single (KNO₃) condition (n = 3–4); blue bars, reference Col-0 accession. Morphometrics modeled root systems architecture phenotypes; those corresponding to extreme root PC1_COL and PC2_COL phenotypes are shown. (C) Manhattan plot illustrating the GWAS mapping of the PC2_COL phenotype.