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Cyto photometric study and statistical analysis of ploidy evolution in cultured tissues of nicotiana tabacum



Cyto photometric study and statistical analysis of ploidy evolution in cultured tissues of nicotiana tabacum



Physiologia Plantarum 51(2): 207-214



Evolution of the ploidy in 4 strains of N. tabacum cv. P 19 was studied by cytophotometry after transformation of the cultured tissues into protoplast suspensions. The limits of these variations were analyzed numerically and statistically. The method used is capable of wide application. It can be used to predict the evolution of the average ploidy level of a strain maintained on a given medium if the average ploidy level of the explant is known. Comparison is made relative to a standard of known ploidy (diploid protoplasts). Increase of the average ploidy level is faster when the explant is mainly diploid (leaf parenchyma) than when it is composed of more heterogeneous tissues as regards ploidy (shoot tip). The appearance of a random drift depends on the composition of the culture medium: it is immediate in one medium (Murashige and Skoog medium, MS2) but is preceded by a phase of relative stability in another medium (MS1) which is richer in kinetin. The statistical method employed is also applicable to cultures of any species for which one can experimentally justify a linear regression analysis.

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Accession: 005082824

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