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To optimize the culture medium for adventitious root (AR) culture of Echinacea pallida, the nitrogen, phosphorus, and sucrose with their different concentrations were combined by using the uniform design method in AR suspension culture. The maximum AR dry weight (5.2 g L−1), phenolic (57.3 mg g−1), and flavonoid (40.8 mg g−1) contents were determined when AR culture medium of the three-quarter strength...
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