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Plant Physiology 47:91-97 (1971)
© 1971 American Society of Plant Biologists

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Articles

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

II. Studies of 14C-Amino Acid Incorporation 1,2

Valgene L. Dunham3 and J. K. Bryan

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

The synergistic inhibition of the growth of Marchantia polymorpha gemmalings by lysine and threonine and its prevention by methionine has been investigated utilizing 14C-labeled amino acids. Experiments involving the uptake of 14C-lysine or 14C-threonine in the presence or absence of methionine indicated that the synergistic growth effects were not a result of altered amino acid uptake. These data, as well as direct chemical analysis, indicated that growth inhibition was correlated with an inhibition of protein synthesis. Experiments utilizing 14C-aspartic acid revealed that the presence of lysine and threonine resulted in increased 14CO2 production and an accumulation of soluble 14C-aspartic acid and labeled ninhydrin-positive compounds. These metabolic alterations were prevented when methionine was also included in the growth media. A model depicting a sequence of events which involve the interaction of regulatory mechanisms is suggested to account for the effects of specific amino acids on plant growth.

3 Present address: Department of Horticulture, Purdue University, Lafayette, Indiana 47907.

1 Supported by National Science Foundation Grants GB 6862 and GB 13427.

2 Taken in part from a dissertation submitted by Valgene L. Dunham to the Graduate School of Syracuse University in partial fulfillment of the requirements for the Ph.D. degree.






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Copyright © 1971 by the American Society of Plant Biologists