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PPI, PPII, and PPVII content in rhizomes (A) and adventitious roots (B) and total polyphyllin content in rhizomes (C) and plantlets (D) of P. polyphylla with different harvest times (one, two, three, four, and five years old). dw, dry weight. Every value is the mean ± SD (n = 5); values with different letters indicate that they had significantly differences between years (p ≤ 0.05).
