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Annals of Botany 87: 275-281, 2001
© 2001 Annals of Botany Company

Patterns of Endopolyploidy During Seedling Development in Cabbage (Brassica oleracea L.)

Nobuhiro Kudo+ and Yasuo Kimura

Division of Plant Biotechnology, Gunma Horticultural Experiment Station, 493 Nishi-Obokata, Sawa-Azuma, Gunma, 379-2224, Japan

Received: 10 August 2000 ; Returned for revision: 25 October 2000 . Accepted: 2 November 2000

Flow cytometric analysis of nuclear DNA contents of somatic tissues of cabbage (Brassica oleracea L.) has revealed extensive endopolyploidization, resulting in tissues that comprise mixtures of cells with different DNA contents, ranging from 2C to 16C. Patterns of endopolyploidy are specific to each developmental stage. Multiple polyploidy was not present in the embryos of dry seeds. Rapid endoreduplication occurred in the radicle and the hypocotyl of the embryos during seed germination. Further endoreduplication cycles were detected in all tissues except those of the shoot tips. In five cabbage cultivars tested, seedlings contained cells of four ploidy levels, corresponding to 2C, 4C, 8C and 16C. Multiploidy may be an integral part of differentiation programs in cabbage plants. The biological significance of endoreduplication in cabbage plants is discussed. Copyright 2001 Annals of Botany Company

Cabbage (Brassica oleracea L.), endopolyploidy, endoreduplication, flow cytometry


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