Plant Physiol. Drug Metab Dispos
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Plant Physiology 44:1601-1608 (1969)
© 1969 American Society of Plant Biologists

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Synergistic Effects of Metabolically Related Amino Acids on the Growth of a Multicellular Plant 1

Valgene L. Dunham2 and J. K. Bryan

a Department of Bacteriology and Botany, Biological Research Laboratories, Syracuse University, Syracuse, New York 13210

The effects of several amino acids related to the metabolism of aspartic acid on the growth and development of gemmalings of the liverwort Marchantia polymorpha were investigated under axenic conditions. Lysine and theonine synergistically inhibit the growth of these plants and cause a loss of normal pigmentation at concentrations as low as 1 µM. These effects are highly specific for this pair of amino acids, are partially reversible upon removal of the effectors, and can be prevented by low concentrations of methionine or its metabolic precursor, homoserine. Alterations in the growth and development of gemmalings in the presence of natural amino acids are discussed in relation to metabolic regulatory mechanisms which have been well established in microorganisms.

2 Present address: Department of Horticulture, Purdue University, Lafayette, Indiana.

1 Supported by NSF Grant GB 6862.






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Copyright © 1969 by the American Society of Plant Biologists