The Effect of Light Intensity and Polyethylene-Glycol-Induced Water Stress on the Growth, Mitragynine Accumulation, and Total Alkaloid Content of Kratom (<i>Mitragyna speciosa</i>) by Nisa Leksungnoen, Tushar Andriyas, Yongkriat Ku-Or, Suthaporn Chongdi, Rossarin Tansawat, Attawan Aramrak, Chatchai Ngernsaengsaruay, Suwimon Uthairatsamee, Weerasin Sonjaroon, Phatthareeya Thongchot, Sirinapa Ardsiri, Pichaya Pongchaidacha

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