Unsprouted potato homogenate: prepare in the same manner as banana homogenate. Potatoes that have not had long storage give the best results. Homogenate obtained from sprouted potato can cause medium browning after culture. . Place flasks in a culture room at 20–25°C under 16–24 hphotoperiod at 40 mmol/m2/s. Swollen embryos with severalrhizoid breaks from testa start to form protocorms after10–14 days in culture and the culture will appear crowded.5. Collect protocorms which have one developed leaf (about5 mm) and transfer them onto the 1st TP medium (Table 2).Be careful not to damage clumps of protocorms during separationof the proliferated protocorm clumps and transfer.Damaged protocorms or seedlings are one of the sources ofgrowth-inhibiting phenolic compounds which turn themedium brown (see Note 3).6. After 2–3 months of the first transfer, transplant seedlingswith two more leaves and roots to the 2nd TP medium(Table 2). Addition of 5% (v/v) coconut water into themedium is favorable for the growth of seedlings. Requiredculture period of second transfer is about 3 months.
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