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JXB Advance Access originally published online on April 23, 2007
Journal of Experimental Botany 2007 58(8):2023-2031; doi:10.1093/jxb/erm071
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Published by Oxford University Press [2007] on behalf of the Society for Experimental Biology.

RESEARCH PAPER

Role of DNA endoreduplication, lipotubuloids, and gibberellic acid in epidermal cell growth during fruit development of Ornithogalum umbellatum

Maria Kwiatkowska*, Katarzyna Poplonska, Andrzej Kazmierczak, Dariusz Stepinski, Katarzyna Rogala and Katarzyna Polewczyk

Department of Cytophysiology, University of Lódz, 90-231 Lódz, Pilarskiego 14, Poland

* To whom correspondence should be addressed. E-mail: kwiat{at}biol.uni.lodz.pl

Cytophotometry of individual nuclei was used to examine the level of endoreduplication in epidermal cells from the upper and lower parts of the ovary during Ornithogalum umbellatum flower and fruit development. An increase in DNA content from 2–4C to 2–8C in both parts of the ovary was observed, while the epidermal cell surface area grew about 6-fold and 15-fold in the lower and upper parts of the ovary, respectively. However, the correlation between mean epidermal cell size and ploidy was distinct during epidermis growth. Lipotubuloids became bigger in the upper than in the lower part during ovary and fruit development. In addition, more dynamic growth of the epidermal cells of the upper than of the lower part of the ovary was connected to the higher content of gibberellic acid. A hypothesis has been put forward that the role of DNA endoreduplication in epidermal cell growth was modulated by the function of lipotubuloids and the gradient of gibberellin.

Key words: Endoreduplication, gradient of gibberellic acid, lipid bodies, lipotubuloids, ovary, regulation of cell growth

Received 29 January 2007; Revised 12 March 2007 Accepted 12 March 2007


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