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JXB Advance Access published online on September 6, 2006
Journal of Experimental Botany, doi:10.1093/jxb/erl100
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© The Author [2006]. Published by Oxford University Press [on behalf of the Society for Experimental Biology]. All rights reserved. For Permissions, please e-mail: journals.permissions@oxfordjournals.org
Received March 14, 2006
Accepted June 30, 2006

RESEARCH PAPER

DNA degradation and nuclear degeneration during programmed cell death in petals of Antirrhinum, Argyranthemum, and Petunia

Tetsuya Yamada 1, Kazuo Ichimura 2, and Wouter G. van Doorn 3 *

1 National Institute of Floricultural Science, Ibaraki 305-8519, Japan; Present address: Tokyo University of Agriculture and Technology, Tokyo, 183-8509 Japan
2 National Institute of Floricultural Science, Ibaraki 305-8519, Japan
3 Wageningen University and Research Centre, PO Box 17, 6700 AA Wageningen, The Netherlands

* To whom correspondence should be addressed.
Wouter G. van Doorn, E-mail: wouter.vandoorn{at}wur.nl


  Abstract

Programmed cell death (PCD) was studied in the petals of Antirrhinum majus, Argyranthemum frutescens, and Petunia hybrida, using DNA degradation and changes in nuclear morphology as parameters. The petals exhibit loss of turgor (wilting) as a visible symptom of PCD. DNA degradation, as shown on agarose gels, occurred in all species studied, prior to visible wilting. The number of DNA masses in all the petals of a flower, determined by flow cytometry, markedly increased in Argyranthemum and Petunia, but decreased in Antirrhinum. Many small DNA masses were observed in Argyranthemum and Petunia. The surface of each small DNA mass stained with the lipophilic fluorochrome 3,3'-dihexyloxacarbocyanine iodide (DiOC6), indicating that these masses were surrounded by a membrane. In Antirrhinum, in contrast, the chromatin fragmented into several small spherical clumps that remained inside a large membranous structure. Nuclear fragmentation, therefore, did not occur in Antirrhinum, whereas nuclear fragmentation possibly was a cause of the small DNA masses in Argyranthemum and Petunia. It is concluded that at least two contrasting nuclear morphologies exist during PCD. In the first, the chromatin fragments inside the nucleus, not accompanied--or followed--by nuclear fragmentation. In the second, a large number of DNA masses were observed each enveloped by a membrane. The second type was probably due, at least partially, to nuclear fragmentation.

Keywords: Chromatin condensation; DNA coiling; DNA degradation; petal senescence; programmed cell death.
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