Summary
Interference with the normal progression of the cell cycle by the drugs caffeine and colchicine does not prevent parenchyma cells in the cortex of pea roots from being reprogrammed to become tracheary and sieve elements following severance of the vascular cylinder of the root. The pattern of secondary wall deposition of the newly differentiated tracheary elements is highly aberrant in the presence of colchicine but is of normal appearance in the caffeinetreated roots. In each case, the new sieve elements have sieve plates and lateral sieve areas with callose deposits. Induction and redifferentiation are achieved in the absence of cell division and microtubules in colchicine-treated roots.
Bi- and multi-nucleate cells are produced by both drugs. Microtubules are still present in the caffeine-treated roots but cell plate formation is inhibited. The partitioning of the multinucleate cortical cells by the interdigitation of “free-growing” walls between the nuclei occurs in the presence of caffeine but not colchicine.
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Hardham, A.R., McCully, M.E. Reprogramming of cells following wounding in pea (Pisum sativum L.) roots. II. The effects of caffeine and colchicine on the development of new vascular elements. Protoplasma 112, 152–166 (1982). https://doi.org/10.1007/BF01284089
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DOI: https://doi.org/10.1007/BF01284089