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Plant Physiol, June 2001, Vol. 126, pp. 742-749
Signaling Events in the Hypoxic Induction of Alcohol
Dehydrogenase Gene in Arabidopsis1
Hsiao-Ping
Peng,
Chui-Sien
Chan,
Ming-Che
Shih,* and
Shang Fa
Yang
Department of Biological Sciences, 204 Chemistry Building,
University of Iowa, Iowa City, Iowa 52242 (H.-P.P., C.-S.C.,
M.-C.S.); Department of Vegetable Crops, University of California,
Davis, California 95616 (S.F.Y.); and Institute of Botany, Academia
Sinica, Taipei, Taiwan (S.F.Y.)
Expression of the alcohol dehydrogenase gene (ADH)
of Arabidopsis is induced during hypoxia. Because many plants increase their ethylene production in response to hypoxic stress, we examined in
this report whether ethylene is involved in the hypoxic induction of
ADH in Arabidopsis. We found that the hypoxic induction
of ADH can be partially inhibited by aminooxy acetic
acid, an inhibitor of ethylene biosynthesis. This partial inhibition
can be reversed by the addition of 1-aminocyclopropane-1-carboxylic
acid, a direct precursor of ethylene. In addition, the hypoxic
induction of the ADH gene is also reduced in
etr1-1 and ein2-1, two ethylene
insensitive mutants in ethylene-signaling pathways, whereas the
addition of exogenous ethylene or an increase in cellular ethylene
alone does not induce ADH under normoxic conditions.
Kinetic analyses of ADH mRNA accumulation indicated that
an ethylene signal is required for the induction of ADH
during later stages of hypoxia. Therefore, we conclude that ethylene is
needed, but not sufficient for, the induction of ADH in
Arabidopsis during hypoxia.
1
This work was supported by the U.S. Department
of Agriculture National Research Initiative Competitive Grants Program
(grant nos. 9900647 and 2000-00665 to M.-C.S.).
*
Corresponding author; e-mail mcshih{at}blue.weeg.uiowa.edu; fax
319-335-3620.
© 2001 American Society of Plant Physiologists
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