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Abstract
The effects of several Krebs Cycle metabolites and related compounds and iron on the formation of 6‐aminolevulinic acid (ALA) in etiolated and iron‐stressed barley leaves were studied. Citrate, in addition to glutamate and α‐ketoglutarate, was found to be effective in enhancing the accumulation of ALA. Succinate was relatively poorly utilized. Ascorbate showed an inhibitory effect. Whereas added FeSO4 depressed ALA content in the etiolated leaves, it enhanced the level in iron‐stressed tissue. Fluoroacetate at 10 mM exhibited a strong inhibitory effect on ALA formation. The activity of aconitase in iron‐stressed plants was increased by treatment of the leaf tissue with iron.
Notes
Sabbatical at Utah State University; Huxley College of Environmental Studies, Western Washington University, Bellingham, Washington 98225
