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Salt and Water Stress Influences Nitrogen Metabolism in Red Kidney Beans¹

ABSTRACT

Both salinity and water deficit reduce yields of crop plants. This study was an attempt to provide a better understanding of these stress effects on N metabolism and the utilization of NH₄-N and NO₃-N.

Red kidney bean plants (Phaseolus vulgaris L.) were grown under salt stress (NaCl), water stress (carbowax), and in a normal nutrient solution (control). The ¹⁵N in NO₃^-, NH₄⁺, -amino acids, total soluble-N, and protein-N in plant shoots were analyzed after the plants received (¹⁵NH₄)₂SO₄ and K¹⁵NO₃ in nutrient solution for 6, 12, 24, and 48 hours. Sodium chloride and carbowax resulted in equal accumulations of NO₃^-, NH₄⁺, and free -amino acids in bean shoots. Protein synthesis was significantly reduced in bean shoots when the plants were subjected to NaCl salinity and carbowax, with either source of N, and the inhibition was more severe under salt stress than water stress.

¹ Contribution from the Department of Soils, Water & Engineering, Arizona Agric. Exp. Stn., Tucson, AZ 85721. Published with approval of the Director as Journal Article no. 2808.

² Former Graduate Student and Professor, respectively, Dep. of Soils, Water & Engineering, The University of Arizona. The senior author is now located at Fortaleza, Ceara, Brazil.

Received for publication January 13, 1978. Accepted for publication May 16, 1978.