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Ribonucleotide Compositional Changes in Wheat Leaves Caused by Water Stress¹

Total ribonucleic acid and nucleotide compositions were determined at different levels of water stress on leaves of winter wheat varieties recognized as being resistant or non-resistant to water stress. Water stress resulted in a reduction of the total ribonucleic acid content with the nonresistant variety showing a greater decrease in ribonucleic acid content per plant than the resistant variety on severe water loss. The (G + C)/(A + U) ratios increased with water stress in both varieties grown under different environmental conditions. Under more severe drought the nonresistant variety gave higher ratios than the more resistant variety. The base composition was also affected by the temperature regime under which the plants were grown, making the interpretation of the effects of water stress alone more difficult.

Key Words: Ribonucleic Acid • Drought • Nucleotide Ratios • Nucleotide Composition

² Graduate student and Professor, Oklahoma State University

Received for publication August 30, 1967.