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Nicotiana tabacum callus studies part 8 comparative efficacy of pith parenchyma and cambial initials in cyto differentiation



Nicotiana tabacum callus studies part 8 comparative efficacy of pith parenchyma and cambial initials in cyto differentiation



Zeitschrift fuer Pflanzenphysiologie 86(3): 251-264



In the tobacco cultivar Kutsaga 614 the time required to attain optimum callus development, arbitrarily taken as the stage when vascular elements differentiate, is approximately 14 and 21 days from cambium and pith precursor explants, respectively. Pith parenchyma cells are quiescent and require a 5-6 day inductive phase in order that nuclear reactivation and presumably RNA and protein synthesis, membrane repair and macromolecular turnover may occur. Cambial initials require no inductive period and cell division proceeds almost immediately. Once growth is initiated, timing in respect of the 2 types of precursor is no longer significant and cells of the respective calli, from a cytological viewpoint, are essentially similar regardless of origin. The process of functional senescence is best exemplified in the formation of sieve and tracheary elements and may be regarded as a special case of cytodifferentiation.

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Accession: 005983693

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Related references

Nicotiana tabacum callus studies. VIII. Comparative efficacy of pith parenchyma and cambial initials in cytodifferentiation. Zeitschrift fur Pflanzenphysiologie 86(3): 251-264, 1978

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