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PLANT PHYSIOLOGY , Vol 115, Issue 1 159-169, Copyright © 1997 by American Society of Plant Biologists
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GENE REGULATION AND MOLECULAR GENETICS |
Effects of Osmoprotectants upon NaCl Stress in Rice
A. B. Garcia, JdA. Engler, S. Iyer, T. Gerats, M. Van Montagu and A. B. Caplan
Laboratorium voor Genetica, Departement Genetica, Vlaams Interuniversitair Instituut voor Biotechnologie, Universiteit Gent, K.L. Ledeganckstraat 35, B-9000 Gent, Belgium (A.B.G., J.d.A.E., T.G., M.V.M., A.B.C.)
Plants accumulate a number of osmoprotective substances in response to NaCl
stress, one of them being proline (Pro). While characterizing some of the
changes in solute accumulation in NaCl-stressed rice (Oryza sativa L.), we
identified several other potential osmoprotectants. One such substance,
trehalose, begins to accumulate in small amounts in roots after 3 d. We
performed a series of experiments to compare the effects of Pro and
trehalose on ion accumulation to determine whether the two chemicals
protect the same physiological processes. We found that Pro either has no
effect or, in some cases, exasperates the effect of NaCl on growth
inhibition, chlorophyll loss, and induction of a highly sensitive marker
for plant stress, the osmotically regulated salT gene. By contrast, low to
moderate concentrations of trehalose reduce Na+ accumulation, salT
expression, and growth inhibition. Somewhat higher concentrations (10 mM)
prevent NaCl-induced loss of chlorophyll in blades, preserve root
integrity, and enhance growth. The results of this study indicate that
during osmotic stress trehalose or carbohydrates might be more important
for rice than Pro.
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