Cytological characteristics of callus tissue formation in the common yew, Taxus baccata. I. Callus induction on the stems

摘要

Some peculiarities of the changes occurring in different stem tissues during induction of callusogenesis were investigated in the yew (Taxus baccata) in vitro. The results obtained revealed that callus formation involves cells of all stem tissues with the exception of tracheids. Initially (up to 21 days of cultivation) callus initiation occurs in the bark cells, whereas cells of the cambium and parenchyma of phloem and xylem enter callusogenesis later (starting from 35 days of cultivation). Transition of the cells from differentiated state to the callus growth is accompanied by cell enlargement.