Plant Physiol. Journal of Pharmacology and Experimental Therapeutics
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Plant Physiology 49:502-505 (1972)
© 1972 American Society of Plant Biologists

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The Influence of Low Substrate Sodium Levels upon the Free Amino Acid Content of Cotton Leaves 1

Ricks H. Pluenneke2 and H. E. Joham

a Department of Plant Sciences, Texas A&M University, College Station, Texas 77843

The sodium nutrition of cotton (Gossypium hirsutum L.) was investigated. Plants were grown in purified nutrient solutions within a chamber designed to minimize sodium contamination. Three nutrient solutions were employed that contained in microequivalents/liter: (a) 0.17 Na, (b) 43.5 Na and (c) 0.75 Cs, 14.41 Li, and 1.17 Rb. All solutions had adequate potassium. Total free amino acids were increased by sodium. Leaves from plants grown in the high sodium solution contained significantly more free asparagine, arginine, and methionine than leaves from plants of the other treatments. The other alkali metals had little or no effect on concentrations of the free amino acids. An unknown was tentatively identified as argininosuccinic acid.

2 Present address: Crop Physiology Laboratory, Agronomy Crops, Mississippi State University, State College, Miss. 39762.

1 This investigation was supported by Cotton Incorporated and is a contribution of the Texas Agricultural Experiment Station.






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