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PLANT PHYSIOLOGY , Vol 107, Issue 2 631-638, Copyright © 1995 by American Society of Plant Biologists
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WHOLE PLANT, ENVIRONMENTAL, AND STRESS PHYSIOLOGY |
Salt Tolerance of Glycinebetaine-Deficient and -Containing Maize Lines
H. Saneoka, C. Nagasaka, D. T. Hahn, W. J. Yang, G. S. Premachandra, R. J. Joly and D. Rhodes
Department of Horticulture, Purdue University, West Lafayette, Indiana 47907 (D.T.H., W.-J.Y, G.S.P., R.J.J., D.R.)
Pairs of homozygous near-isogenic glycinebetaine-containing (Bet1/Bet1) and
-deficient (bet1/bet1) F8 lines of Zea mays L. (maize) were tested for
differences in salt (150 mM NaCl or 127.25 mM NaCl plus 22.5 mM CaCl2)
tolerance. The Bet1/Bet1 lines exhibited less shoot growth inhibition (as
measured by dry matter accumulation, leaf area expansion rate and/or, plant
height extension rate) under salinized conditions in comparison to their
nearisogenic bet1/bet1 sister lines. These growth differences were
associated with maintenance of a significantly higher leaf relative water
content, a higher rate of carbon assimilation, and a greater turgor in
Bet1/Bet1 lines than in bet1/bet1 lines under salinized conditions. These
results strongly suggest that a single gene conferring glycinebetaine
accumulation (and/or a tightly linked locus) plays a key role in osmotic
adjustment in maize.
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