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Aconitate Accumulation in Wheat Seedlings

Gustavo A. Orioli and John F. Thompson
Botanical Gazette
Vol. 151, No. 1 (Mar., 1990), pp. 30-37
Stable URL: http://www.jstor.org/stable/2995277
Page Count: 8
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Aconitate Accumulation in Wheat Seedlings
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Abstract

Wheat seedlings (Triticum aestivum L.) were induced to accumulate aconitate and malate in the leaves but not in the roots. The accumulated aconitate was predominantly the trans-isomer. After 4 d of treatment, wheat seedlings contained 8.5-fold more aconitate and 4.2-fold more malate when grown in 5 mM K2SO4 + 0.5 mM CaSO4 than in 5 mM CaSO4. Other organic acids were not markedly affected. Administering labeled acetate to the roots showed that the accumulation of acids in the leaves was not due to translocation from the roots or to a simple balancing of the charges in the root due to a differential rate of cation and anion uptake. After labeling organic acids in vivo with 14C from radioactive acetate, it was shown that aconitate, but not malate, was less metabolically active than other organic acids. Aconitate accumulation was partly related to metabolic inactivity but malate accumulation was not.

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