Materials and methodsTransformed root culturesHairy root cultures of Taxus media var. Hicksii wereestablished using three strains of Agrobacterium rhizogenes:ATCC 15834, TR 105 and LBA 9402. Theshoot tips, young leaves and hypocotyls of 8-week oldseedlings (obtained using the Zhiri et al. 1994 method)were directly wounded with a sterile needle containingbacteria. In one experiment 15 seedlings werecontaminated by the same bacterial strain. Infectedseedlings were placed on hormone-freemodified DCRmedium (Gupta & Durzan 1985) with addition of sucrose(20 g l
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