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Comparison of differences in nutrient contents in leaves of diploid (CK) and tetraploid (T10, T18, and T39): (a) total sugar; (b) flavonoids; (c) total protein; (d) polysaccharides; (e) betaine; (f) total amino acids; (g) calcium; (h) iron; (i) zinc. The different letters in the same figure indicate significant differences based on Duncan’s multiple range test at the 0.05 probability level.
