caa a22 4500 469027290 CHVBK 20180323132733.0 cr unu---uuuuu 170328e19921201xx s 000 0 eng 10.1007/BF00232414 doi (NATIONALLICENCE)springer-10.1007/BF00232414 Ploidy-dependent genomic stability in the tissue cultures of ornamental Phlox drummondii Hook [Elektronische Daten] [Varsha Raja, K. Koul, S. Raina, Ajay Parida] Comparisons of the chromosome numbers, 2C nuclear DNA amounts and karyomorphology were made in explant cultures of diploid (2n = 2x = 14) and autotetraploid (2n = 4x = 28) Phlox drummondii. In 6-36 week old calli derived from diploid internodal segment explants, and in cells of root tips regenerated from such callus, marked differences were observed in chromosome number. The chromosome numbers ranged from 2n = 14 to 2n = 100 and DNA amounts from 8.20 to 63.20 pg in the diploid derived callus, while the extent of variation was much reduced in the regenerated roots. In contrast, the autotetraploid cultures were characterised by the maintenance of the same chromosome number and DNA amounts as the mother plant. Modified chromosome structures were not apparent in any of the cultures. The possible reasons for the chromosomal instability at the diploid level and stability at the tetraploid level are discussed. Springer-Verlag, 1992 Raja Varsha Laboratory of Cellular and Molecular Cytogenetics, Department of Botany, University of Delhi, 110007, Delhi, India aut Koul K. Laboratory of Cellular and Molecular Cytogenetics, Department of Botany, University of Delhi, 110007, Delhi, India aut Raina S. Laboratory of Cellular and Molecular Cytogenetics, Department of Botany, University of Delhi, 110007, Delhi, India aut Parida Ajay Laboratory of Cellular and Molecular Cytogenetics, Department of Botany, University of Delhi, 110007, Delhi, India aut Plant Cell Reports Springer-Verlag 12/1(1992-12-01), 12-17 0721-7714 12:1<12 1992 12 299 https://doi.org/10.1007/BF00232414 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00232414 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Raja Varsha Laboratory of Cellular and Molecular Cytogenetics, Department of Botany, University of Delhi, 110007, Delhi, India aut NATIONALLICENCE 700 1- Koul K. Laboratory of Cellular and Molecular Cytogenetics, Department of Botany, University of Delhi, 110007, Delhi, India aut NATIONALLICENCE 700 1- Raina S. Laboratory of Cellular and Molecular Cytogenetics, Department of Botany, University of Delhi, 110007, Delhi, India aut NATIONALLICENCE 700 1- Parida Ajay Laboratory of Cellular and Molecular Cytogenetics, Department of Botany, University of Delhi, 110007, Delhi, India aut NATIONALLICENCE 773 0- Plant Cell Reports Springer-Verlag 12/1(1992-12-01), 12-17 0721-7714 12:1<12 1992 12 299 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer