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Environmental and Stress Physiology

Effects of Sodium Chloride on the Hydraulic Conductivity of Soybean Root Systems ¹

Department of Horticulture, Purdue University, West Lafayette, Indiana 47907

Root system hydraulic conductivity (L_P) was measured on soybean (Glycine max [L.] Merr. var Harosoy) seedlings grown in solution culture and exposed to varying levels of osmotic stress. Hydroponic growth solutions were salinized by additions of NaCl, and the permeability of excised seedling root systems to water was measured. Conductance was estimated at high rates of water flux, where osmotic effects are negligible. L_P was reduced as the salinity of the growth solution increased. Growth in NaCl for 14 days at –0.17 megapascals and –0.26 megapascals resulted in reductions in L_P from that of controls by 27% and 72%, respectively. L_P was correlated with the root/shoot biomass ratio (RS), with larger values of L_P observed in seedlings with lower RS.

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