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Endo poly ploidy in the antipodals of ranunculus peltatus and ranunculus penicillatus



Endo poly ploidy in the antipodals of ranunculus peltatus and ranunculus penicillatus



Acta Biologica Cracoviensia Series Botanica 22(2): 163-172



The differentiation of the antipodals in R. peltatus and R. penicillatus is connected with endomitotic polyploidization. In R. peltatus the development of antipodals was studied in comparison with that of the endosperm. The maximum of endomitotic activity coincides with the nuclear developmental stage of the endosperm. The nuclei of the antipodals may reach the degree of polyploidy up to 64n. In the cellular stage of endosperm the degeneration of the antipodals takes place. In self-incompatible population of R. penicillatus from Lwowek Slaski the antipodals reach lower degrees of polyploidy (32n, as a maximum) than those of R. peltatus. In the self-incompatible plants from Ladek Zdroj, the antipodals remain on the haploid level. In R. penicillatus the endopolyploid nuclei of the antipodals reveal endochromocenters; in R. peltatus besides these structure, some polyploid nuclei show bundle-like aggregations of chromatin reminding of polytene chromosomes.

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Accession: 005356395

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