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PCA of alfalfa mineral content. The mineral content of the 10 elements Mn, Fe, Co, Cu, Zn, Mo, Na, Mg, K and Ca is analyzed in four replicates and in four organs (fine roots, taproot, stem and leaves). Six conditions of copper availability are tested (3 nM, 30 nM, 300 nM, 1 µM, 3 µM and 10 µM). Black dots represent each sample (96 in total). Squares represent the barycenter of the 24 samples per organ.
