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PLANT PHYSIOLOGY , Vol 113, Issue 4 1033-1039, Copyright © 1997 by American Society of Plant Biologists
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WHOLE PLANT, ENVIRONMENTAL, AND STRESS PHYSIOLOGY |
Internal Detoxification Mechanism of Al in Hydrangea (Identification of Al Form in the Leaves)
J. F. Ma, S. Hiradate, K. Nomoto, T. Iwashita and H. Matsumoto
Research Institute for Bioresources, Okayama University, Chuo 2-20-1, Kurashiki 710, Japan (J.F.M., H.M.)
An internal detoxification mechanism for Al was investigated in an
Al-accumulating plant, hydrangea (Hydrangea macrophylla), focusing on Al
forms present in the cells. The leaves of hydrangea contained as much as
15.7 mmol Al kg-1 fresh weight, and more than two-thirds of the Al was
found in the cell sap. Using 27Al- nuclear magnetic resonance, the dominant
peak of Al was observed at a chemical shift of 11 to 12 parts per million
in both intact leaves and the extracted cell sap, which is in good
accordance with the chemical shift for the 1:1 Al-citrate complex.
Purification of cell sap by molecular sieve chromatography (Sephadex G-10)
combined with ion-exclusion chromatography indicated that Al in fractions
with the same retention time as citric acid contributed to the observed
27Al peak in the intact leaves. The molar ratio of Al to citric acid in the
crude and purified cell sap approximated 1. The structure of the ligand
chelated with Al was identified to be citric acid. Bioassay experiments
showed that the purified Al complex from the cell sap did not inhibit root
elongation of corn (Zea mays L.) and the viability of cells on the root tip
surface was also not affected. These observations indicate that Al is bound
to citric acid in the cells of hydrangea leaves.
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