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Plant and Cell Physiology, 1994, Vol. 35, No. 5 729-735
© 1994

Changes in Roots Lipid Composition and Inhibition of the Extrusion of Protons during Salt Stress in Two Genotypes of Soybean Resistant or Susceptible to Stress. Varietal Differences

Ana María Zenoff, Mirna Hilal, Mercedes Galo and Hortensia Moreno

Departamento de Bioquímica de la Nutrición, Instituto Superior de Investigaciones Biológicas, Consejo Nacional de Investigaciones Científicas y Técnicas, Universidad Nacional de Tucumán and Instituto de Química Biológica Dr. "Bernabé Bloj" Chacabuco 461, 4000 San Miguel de Tucumán, Tucumán, Argentina

The effect of saline stress on the lipid composition of root cells and on the extrusion of proton in intact soybean roots from two genotypes, Bragg (salt tolerant) and Dowling (salt sensitive), was studied.

The phospholipid content was not affected, but the free sterols and the triglycerides increased in both genotypes. A quite different salt effect was observed in the glycolipid response of both varieties: Dowling increased all its glycolipid classes while Bragg showed no change, though in the monoglycosyldiacylglycerol/diglycosyldiacylglycerol ratio increased from 0.8 to 2.0. The fatty acid composition remained unchanged in both lines.

The extrusion of protons in intact soybean roots was investigated at different NaCl concentrations. It was gradually inhibited in both genotypes, being Dowling more severely inhibited.

The total amount of glycolipids and the monoglycosyldiacylglycerol/diglycosyldiacylglycerol ratio increased as a function of the salt concentration, concomitantly the proton extrusion activity declined in both varieties.

The results obtained indicated that the saline stress affected differently the lipid metabolism in the two lines studied, and strongly suggest that the decline in the proton extrusion activity may be induced by more or less important changes in the membrane fluidity.

(Received November 5, 1993; Accepted April 12, 1994)
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