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Arabidopsis Roots and Shoots Have Different Mechanisms for
Hypoxic Stress Tolerance
Marc H. Ellis,
Elizabeth S. Dennis*, and
W. James Peacock
Commonwealth Scientific and Industrial Research Organization,
Division of Plant Industry, G.P.O. Box 1600, Canberra ACT 2601, Australia; and Commonwealth Scientific and Industrial Research Organization,
Division of Plant Industry, G.P.O. Box 1600, Canberra ACT 2601, AustraliaCooperative Centre for Sustainable Cotton Production,
Australian Cotton Research Institute, P.O. Box 59, Narrabri, NSW 2390, Australia
Arabidopsis has
inducible responses for tolerance of O2 deficiency. Plants
previously exposed to 5% O2 were more tolerant than the
controls to hypoxic stress (0.1% O2 for 48 h) in both roots and shoots, but hypoxic acclimation did not improve tolerance to
anoxia (0% O2). The acclimation of shoots was not
dependent on the roots: increased shoot tolerance was observed when the roots of the plants were removed. An adh
(alcohol dehydrogenase) null mutant
did not show acclimation of the roots but retained the shoot survival
response. Abscisic acid treatment also differentiated the root and
shoot responses; pretreatment induced root survival in hypoxic stress
conditions (0.1% O2) but did not induce any increase in
the survival of shoots. Cycloheximide blocked both root and shoot
acclimation, indicating that both acclimation mechanisms are dependent
on protein synthesis.
*
Corresponding author; e-mail liz{at}pican.pi.csiro.au; fax
61-2-6246-5000.
Plant Physiol. (1999) 119: 57-64
Copyright Clearance Center: 0032-0889/99/119//08
© 1999 American Society of Plant Physiologists
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