Journal of Experimental Botany, Vol 49, 1987-1997, Copyright © 1998 by Oxford University Press
T Panavas, E Walker and B Rubinstein
Daylily flowers (Hemerocallis hybrid, cv. Stella
d'Oro) senesce and die autonomously over a 24 h period after opening.
Investigations were performed to determine some of the mechanisms that lead
to death of the petals. The flowers are insensitive to ethylene, but
exogenous ABA prematurely upregulates events that occur during natural
senescence, such as loss or differential membrane permeability, increases
in lipid peroxidation and the induction of proteinase and RNase activities.
Furthermore, the same patterns of proteinase and RNase activities appearing
on activity gels during natural senescence are induced prematurely by ABA.
The mRNA profile from ABA-treated, prematurely senescing petals visualized
by differential display shows a high degree of similarity to the mRNA
profile of naturally senescing petals 18 h later. In addition, endogenous
ABA increases before flower opening and continues to increase during petal
senescence. An osmotic stress by sorbitol increases endogenous levels of
ABA and upregulates the same parameters of senescence as those occurring
during natural senescence and after application of ABA. The mRNA profile
from sorbitol-treated, prematurely senescing petals, but somewhat less
similarity to mRNA from ABA-treated petals. The possibility is discussed
that ABA is a constituent of the signal transduction chain leading to
programmed cell death of daylily petals.Key words:
Abscisic acid, daylily, differential display,
Hemerocallis, organ senescence, programmed cell death.
ARTICLES
Possible involvement of abscisic acid in senescence of daylily petals
Biology Department and Plant Biology Graduate Program, University of Massachusetts, Amherst, MA 01003-5810, USA; Corresponding author e-mail: bernrub@bio.umass.edu
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