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PCA of alfalfa mineral content carried out by plant organ (A, fine roots; B, taproot; C, stem; D, leaves). The mineral content of the 10 elements Mn, Fe, Co, Cu, Zn, Mo, Na, Mg, K and Ca is analyzed in four replicates. Six conditions of copper availability are tested [(Cu1) 3 nM, (Cu2) 30 nM, (Cu3) 300 nM, (Cu4) 1 µM, (Cu5) 3 µM and (Cu6) 10 µM]. Black dots represent each sample (24 in total). Squares represent the barycenter of the four replicates per copper condition.
