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PLANT PHYSIOLOGY , Vol 112, Issue 3 1135-1140, Copyright © 1996 by American Society of Plant Biologists
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WHOLE PLANT, ENVIRONMENTAL, AND STRESS PHYSIOLOGY |
Root Growth Inhibition in Boron-Deficient or Aluminum-Stressed Squash May Be a Result of Impaired Ascorbate Metabolism
K. M. Lukaszewski and D. G. Blevins
Department of Agronomy, University of Missouri, 1-87 Agriculture Building, Columbia, Missouri 65211
Although cessation of growth is the most apparent symptom of boron
deficiency, the biochemical function of boron in growth processes is not
well understood. We propose that the action of boron in root meristems is
associated with ascorbate metabolism. Total inhibition of root growth in
squash (Cucurbita pepo L.) plants transferred to boron-free medium
coincided with a major decrease (up to 98%) in the ascorbate concentration
of root apices. Under low-boron conditions, in which root growth was
partially inhibited, ascorbate concentration declined in proportion to
growth rate. The decline in ascorbate concentration in boron-deficient root
tips was not related to ascorbate oxidation. Ascorbate added to the medium
improved root growth in plants supplied with insufficient boron. Increasing
concentrations of aluminum in the nutrient medium caused progressive
inhibition of root growth and a parallel reduction in ascorbate
concentration of root apices. Elevated boron levels improved root growth
under toxic aluminum conditions and produced root apices with higher
ascorbate concentrations. To our knowledge, this is the first report of a
correlation between boron nutrition, ascorbate concentration in root
apices, and growth. These findings show that root growth inhibition
resulting from either boron deficiency or aluminum toxicity may be a
consequence of disrupted ascorbate metabolism.
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