Genome Size Change During Plant Development - Does It Depend On Original Ploidy Level?
D Siwinska and J MaluszynskaDept. of Plant Anatomy and Cytology, University of Silesia, Jagiellonska 28, 40-032 Katowice, Poland
Brassica species, in common with most angiosperms, belong to the polysomatic type of plants. Development in these is related to genome size changes during differentiation, by which cells undergo several rounds of endoreduplication leading to the formation of mixoploid tissues and organs. An organ-specific ploidy pattern has been shown in some diploid Brassica species(1,2). It is interesting to see whether the endoreduplication pattern in allotetraploid species is similar to those of diploids. The "U-Triangle"(3) consists of three diploid or ancestral and three allotetraploid species of Brassica, which were the subject of our study. Comparative flow cytometric analysis of ploidy levels in seedlings and leaves of diploid species (B. nigra, B. oleracea, B. campestris) and allotetraploid ones (B. napus, B. carinata, B. juncea) will be presented.
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3. U N (1935). Japanese Journal of Botany 7: 389-452.