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Interphase nuclear structure in plants role of nuclear dna content and highly repeated dna sequences in chromatin condensation



Interphase nuclear structure in plants role of nuclear dna content and highly repeated dna sequences in chromatin condensation



Proceedings of the Indian Academy of Sciences Plant Sciences 94(4-6): 539-552



Using the HCl-Giemsa banding technique, the total proportion of condensed chromatin was determined by planimetry in 23 plant species and was found to vary from 14-77%. Comparison of condensed chromatin values with DNA content indicated that the latter was involved in determining the interphase nuclear structure. The actual amounts of different DNA components in these species were estimated in terms of picograms. Statistical analysis of condensed chromatin values with quantities of different types of DNA sequences showed the best correlation with highly repeated DNA sequences, suggesting that these sequences could be playing an important role in governing the species-specific chromatin condensation in plants. The amount of DNA packaged per unit length of chromatin was also shown to be a determinant of interphase nuclear structure.

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