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Mixoploidy in wild and cultivated Cruciferae species able to hybridize with Brassica napus

Kunakh V.A., Adonin V.I., Ozheredov S.P., Blume Ya.B.

 


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Chromosome numbers in root meristem cells of the seedlings of wild and cultivated Cruciferae species able to hybridize with Brassica napus have been studied. The seedlings of Brassica junceae, Diplotaxis tenuifolia and Raphanum raphanistrum showed exclusively diploid metaphases. Up to 5 % of B.ánapus and B.ácretica seedlings were mixoploids. Diploid cells prevailed among the mixoploids, but hypoľ and hyperdiploid ones were observed as well. Near 20 % of B.ácampestris and R.ásativum seedlings were mixoploid, and diľ tetraploid chimeras constituted considerable proportion of them. Less than a half of B.ánigra seedlings were diploid, while the rest of plants were mixoploid. Among them the seedlings bearing preferentially tetraľ and triploid cells dominated. Biological implications and presumable reasons underlying the discovered mixoploidy are discussed.

Key words: Brassica, mixoploidy

Tsitologiya i Genetika 2008, vol. 42, no. 3, pp. 81-86

E-mail: kunakh imbg.org.ua

Kunakh V.A., Adonin V.I., Ozheredov S.P., Blume Ya.B. Mixoploidy in wild and cultivated Cruciferae species able to hybridize with Brassica napus, Tsitol Genet., 2008, vol. 42, no. 3, pp. 81-86.




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