[Callus induction, subculture, and browning inhibition of the anticancer plant <i>Taxus media</i>].

In order to obtain more effective cell culture parameters of Taxus anticancer plants, we optimized the callus induction and subculture conditions of the explants (stem segments with buds) of the anticancer medicinal plant <i>Taxus media</i> by using the plant tissue culture technology and orthogonal test. Furthermore, we studied the method to inhibit browning in the culture. The results indicated that the optimal conditions for inducing callus was culture in the medium composed of B₅+0.25 mg/L 2, 4-D+1.5 mg/L NAA+0.5 mg/L KT in the dark, which showed short induction time and a high induction rate (86.7%). The formula of the optimal medium for subculture was B₅+0.5 mg/L 2, 4-D+2.0 mg/L NAA+1.5 mg/L KT.The proliferation multiple of callus cultured by subculture on the 10th day of callus growth was the highest. Activated carbon inhibited the browning in callus subculture, with the optimal inhibitory concentration of 0.8 g/L. The results of this study lay a foundation for the production of taxol by suspension culture of <i>T</i>. <i>media</i> cells.