Summary
Bellevalia romana (L.) Rchb., a monocotyledonous plant characterized by few (2 n=2 x=8) and very large chromosomes, is a useful subject for studying developmental problemsin vitro. Cytological analysis of callus revealed that the majority of cells were diploid, but the remaining cells had aneuploid nuclei with a wide range of chromosome numbers, tetraploid and haploid nuclei. The frequency of aneuploid and polyploid cells was higher in callus grown in the presence of 2,4-D than in callus grown in NAA plus BAP. These nuclei seemed to increase with the duration of culture. The chromosome number distribution as determined by chromosome counts in calli at different culture times was confirmed by DNA cytophotometry. Chromosome number mosaicism (mixoploidy and aneusomaty) also occurred in all root apices of 9 out of 46 plantlets regenerated from callusvia adventitious shoots.
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Cavallini, A., Cremonini, R., Lupi, M.C. et al. In vitro culture ofBellevalia romana (L.) Rchb.. Protoplasma 132, 58–63 (1986). https://doi.org/10.1007/BF01275790
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DOI: https://doi.org/10.1007/BF01275790