Although illumination increased the gutta content, the propagation times of callus decreased; therefore the total production efficiency of gutta was high under dark culture.
增加光照虽然能增加含胶量，但愈伤组织增殖倍数降低，杜仲胶生产的总效率以暗培养为好。
2
The illumination, assessment index of positive and negative ions and total bacteria in office with air-conditioner were lower than those of natural ventilation office (P< 0.01).