Crop Science Journal of Natural Resources and Life Sciences Education
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Published in Crop Sci 10:175-178 (1970)
© 1970 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Effect of Root Aeration on Amino Acid Levels in Cotton Plants1

Gene Guinn and L. A. Brinkerhoff2

Oxygen deficiency in the rooting medium altered amino acid levels in roots, xylem sap, and leaves of cotton plants (Gossypium hirsutum L.). In general, poor root aeration increased amino acid levels in roots and sap, but decreased amino acid levels in leaves. Poor root aeration greatly increased alanine and also increased serine, gamma-aminobutyric acid, glutamic acid, and glutamine contents of roots and xylem sap. On the other hand, poor root aeration had almost no effect on asparagine content of roots and decreased asparagine contents of xylem sap and leaves.

Key Words: Alanine • Gamma-aminobutyric acid • Asparagine • Asparic acid • Glutamic acid • Glutamine • Oxygen deficiency • Serine • Verticillium wilt • Xylem sap

1 Joint contribution of the Crops Research Division, Agricultural Research Service, U.S. Department of Agriculture, and the Oklahoma Agricultural Experiment Station. Approved by the Director of the Oklahoma Agricultural Experiment Station as Journal Manuscript No. 1910.

2 Plant Physiologist and Plant Pathologist, Crops Research Division, and Department of Botany and Plant Pathology, Oklahoma State University, Stillwater, Okla. 74074.

Received for publication September 21, 1969.




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