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Plant Physiol, November 2001, Vol. 127, pp. 876-886
Senescence Is Induced in Individually Darkened Arabidopsis
Leaves, but Inhibited in Whole Darkened Plants1
L. Michael
Weaver* and
Richard M.
Amasino
The Sainsbury Laboratory, John Innes Centre, Colney Lane,
Norwich NR4 7UH, United Kingdom (L.M.W.); and Department of
Biochemistry, University of Wisconsin, 433 Babcock Drive, Madison,
Wisconsin 53706 (R.M.A.)
It has long been known that leaf senescence can be induced in many
plant species by detaching leaves and placing them in the darkness. It
recently has been shown that entire Arabidopsis plants placed in the
darkness are not induced to senesce, as judged by visible yellowing and
certain molecular markers. Here, we show that when individual
Arabidopsis leaves are darkened, but not when entire plants are
darkened, senescence is induced in the covered leaves. This induction
of senescence is highly localized. The phenomenon is leaf age dependent
in that it occurs more rapidly and strongly in older leaves than in
younger ones, as is the case with many forms of induced senescence.
Whole adult plants placed in darkness, in contrast, show delayed
senescence, although seedlings lacking primary leaves do not. These
observations imply that the light status of the entire plant affects
the senescence of individual leaves. A model summarizing the results is presented.
1
This work was supported by the Consortium
for Plant Biotechnology Research (grant no. DE-FG02-97ER20280), by
U.S.-Israel Binational Agricultural Research and Development
Fund (grant no. IS-2894-97), and by the Graduate School
of the University of Wisconsin. L.M.W. was partially supported by the
National Institutes of Health (training grant no. T32 GM07215).
*
Corresponding author; e-mail lm.weaver{at}bbsrc.ac.uk; fax
44-1603-450011.
© 2001 American Society of Plant Physiologists
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