Journal of Experimental Botany, Vol 49, 1293-1301, Copyright © 1998 by Oxford University Press
M Wang, B Oppedijk, M Caspers, G Lamers, M Boot, D Geerlings, B Bakhuizen, A Meijer and B Van Duijn
During germination of barley grains, the appearance of DNA fragmentation
started in aleurone cells near the embryo and extended to the distal end in
a time-dependent manner. DNA fragmentation was demonstrated to occur only
after the expression of
ARTICLES
Spatial and temporal regulation of DNA fragmentation in the aleurone of germinating barley
Center for Phytotechnology RUL/TNO, TNO Department of Plant Biotechnology, Wassenaarseweg 64, 2333 AL Leiden, The Netherlands; Center for Phytotechnology RUL/TNO, Institute of Molecular Plant Sciences, EMCA unit, Leiden University, Wassenaarseweg 64, 2333 AL Leiden, The Netherlands; Center for Phytotechnology RUL/TNO, Institute of Molecular Plant Sciences, Leiden University, Wassenaarseweg 64, 2333 AL Leiden, The Netherlands; Corresponding author
-amylase mRNA in
the aleurone layer. In addition, cell wall degradation started in cells
near the embryo on the sides facing the endosperm. Subsequently cell wall
degradation extended to the lateral cell walls and to cells more to the
distal end of the grain. A typical alteration of the nucleus was observed
by electron microscopy and an almost complete degradation of DNA was found
in the nucleus while the nuclear envelope remained intact. The results
indicate that programmed cell death occurred in aleurone cells during
germination. A model is proposed for the regulation of programmed cell
death in aleurone cells during germination involving ABA levels and cell
wall degradation.Keywords: Barley aleurone, programmed
cell death, hydrolytic enzymes, cell walls
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