S Preparation
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Seeds of C. roseus “Equator White Eye” (Sa … Seeds of C. roseus “Equator White Eye” (Sakata Seeds, Co., Ltd., Kanagawa, Japan) were sown in the soil of pods [Pro-Mix BX (Premier Tech Horticulture, Inc., Rivière-du-Loup, QC, Canada): vermiculite = 2:1, supplemented with fertilizer]. The pods were set in a growth chamber at 24°C and a relative humidity of approximately 60% under a 16-h light (approximately 190 μmol s-1 m-2)/8-h dark cycle. The root parts of 6-weeks-old plants were harvested and immediately frozen in liquid nitrogen. The root samples were finally freeze-dried and stored at room temperature in a box containing silica gel. The hook parts of U. rhynchophylla were harvested in the medicinal plant garden of Chiba University (Chiba, Japan). The samples were dried and stored at room temperature in a box containing silica gel. emperature in a box containing silica gel.
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