Abstract
Cell dedifferentiation was induced inVicia faba root tissues by removing the whole root meristem (decapitation) and the behaviour of the nuclear DNA in the dedifferentiating cells was studied by means of cytophotometric and autoradiographic analyses. Cytophotometric determination after Feulgen-staining showed that: 1. the vast majority of nuclei in differentiated cells were in the DNA postsynthetic phase, but their Feulgen absorption was lower than that of DNA postsynthetic nuclei (G2, 4 C) in the meristem; 2. such a Feulgen absorption was detected in certain nuclei after root decapitation; 3. all the mitoses in the dedifferentiating tissues were diploid, fully matching the Feulgen absorption of mitoses in the meristem.
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