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Effects of different drought stress induced by polyethylene glycol (PEG-6000) treatments on the root lengths (a), root surface areas (“Root SurfArea”) (b), average root diameters (“Root AvgDiam”) (c), and root volumes (d) of XM (high-grain Cadmium (Cd)-accumulating genotype) and YM (low-grain Cd-accumulating genotype) under 100 µmol L−1 of Cd stress. The different letters indicate significant differences at p < 0.05 according to a least significant difference (LSD) test.
