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Plant Physiol, April 2000, Vol. 122, pp. 1323-1334
Programmed Cell Death during Pollination-Induced Petal Senescence
in Petunia1
Yan
Xu and
Maureen R.
Hanson*
Department of Molecular Biology and Genetics, Cornell University,
Ithaca, New York 14853
Petal senescence, one type of
programmed cell death (PCD) in plants, is a genetically controlled
sequence of events comprising its final developmental stage. We
characterized the pollination-induced petal senescence process in
Petunia inflata using a number of cell performance
markers, including fresh/dry weight, protein amount, RNA amount, RNase
activity, and cellular membrane leakage. Membrane disruption and DNA
fragmentation with preferential oligonucleosomal cleavage, events
characteristic of PCD, were found to be present in the advanced stage
of petal senescence, indicating that plant and animal cell death
phenomena share one of the molecular events in the execution phase. As
in apoptosis in animals, both single-stranded DNase and double-stranded
DNase activities are induced during petal cell death and are enhanced
by Ca2+. In contrast, the release of cytochrome
c from mitochondria, one commitment step in signaling of
apoptosis in animal cells, was found to be dispensable in petal cell
death. Some components of the signal transduction pathway for PCD in
plants are likely to differ from those in animal cells.
1
This research was supported by the U.S.
Department of Agriculture Hatch Program and the Energy Biosciences
Program of the U.S. Department of Energy (grant no. FG02-89ER14030 to
M.R.H.), and by a fellowship from the Cornell National Science
Foundation/Department of Energy/U.S. Department of Agriculture Plant
Science Center (to Y.X.).
*
Corresponding author; e-mail mrh5{at}cornell.edu; fax
607-255-6249.
© 2000 American Society of Plant Physiologists
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