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Myo-Inositol-Dependent Sodium Uptake in Ice
Plant1
Donald E. Nelson2,
Michelle Koukoumanos, and
Hans J. Bohnert*
Department of Biochemistry (D.E.N., M.K., H.J.B.), Department of
Plant Sciences (H.J.B.), and Department of Molecular and Cellular
Biology (H.J.B.), The University of Arizona, Tucson, Arizona 85721
In
salt-stressed ice plants (Mesembryanthemum
crystallinum), sodium accumulates to high concentrations in
vacuoles, and polyols (myo-inositol,
D-ononitol, and D-pinitol) accumulate in the
cytosol. Polyol synthesis is regulated by NaCl and involves induction
and repression of gene expression (D.E. Nelson, B. Shen, and H.J. Bohnert [1998] Plant Cell 10: 753-764). In the study reported here
we found increased phloem transport of myo-inositol and
reciprocal increased transport of sodium and inositol to leaves under
stress. To determine the relationship between increased translocation and sodium uptake, we analyzed the effects of exogenous
application of myo-inositol: The NaCl-inducible ice
plant myo-inositol 1-phosphate synthase is repressed in
roots, and sodium uptake from root to shoot increases without
stimulating growth. Sodium uptake and transport through the xylem was
coupled to a 10-fold increase of myo-inositol and
ononitol in the xylem. Seedlings of the ice plant are not
salt-tolerant, and yet the addition of exogenous myo-inositol conferred upon them patterns of gene
expression and polyol accumulation observed in mature, salt-tolerant
plants. Sodium uptake and transport through the xylem was enhanced in the presence of myo-inositol. The results indicate an
interdependence of sodium uptake and alterations in the distribution of
myo-inositol. We hypothesize that
myo-inositol could serve not only as a substrate for the
production of compatible solutes but also as a leaf-to-root signal that
promotes sodium uptake.
1
This work was supported by the
National Science Foundation (grant nos. IBN-9507375 and MCB-9808932)
and in part by the Arizona Agricultural Experiment Station.
2
Present address: Monsanto Life Sciences Co., St.
Louis, MO. 63198.
*
Corresponding author; e-mail bohnerth{at}u.arizona.edu; fax
1-520-621-1697.
Plant Physiol. (1999) 119: 165-172
Copyright Clearance Center: 0032-0889/99/119//08
© 1999 American Society of Plant Physiologists
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