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PLANT PHYSIOLOGY , Vol 113, Issue 2 527-534, Copyright © 1997 by American Society of Plant Biologists
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WHOLE PLANT, ENVIRONMENTAL, AND STRESS PHYSIOLOGY |
Al Partitioning Patterns and Root Growth as Related to Al Sensitivity and Al Tolerance in Wheat
T. D. Samuels, K. Kucukakyuz and M. Rincon-Zachary
Department of Biology, Midwestern State University, 3410 Taft Boulevard, Wichita Falls, Texas 76308
Studies of Al partitioning and accumulation and of the effect of Al on the
growth of intact wheat (Triticum aestivum L.) roots of cultivars that show
differential Al sensitivity were conducted. The effects of various Al
concentrations on root growth and Al accumulation in the tissue were
followed for 24 h. At low external Al concentrations, Al accumulation in
the root tips was low and root growth was either unaffected or stimulated.
Calculations based on regression analysis of growth and Al accumulation in
the root tips predicted that 50% root growth inhibition in the Al-tolerant
cv Atlas 66 would be attained when the Al concentrations were 105 [mu]M in
the nutrient solution and 376.7 [mu]g Al g-1 dry weight in the tissue. In
contrast, in the Al-sensitive cv Tam 105, 50% root growth inhibition would
be attained when the Al concentrations were 11 [mu]M in the nutrient
solution and 546.2 [mu]g Al g-1 dry weight in the tissue. The data support
the hypotheses that differential Al sensitivity correlates with
differential Al accumulation in the growing root tissue, and that
mechanisms of Al tolerance may be based on strategies to exclude Al from
the root meristems.
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