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Absorption and Translocation of Sodium in Beans and Cotton ¹

United States Salinity Laboratory, ARS, United States Department of Agriculture, Riverside, California, Soil and Water Conservation Research Division, ARS, United States Department of Agriculture, Riverside, California

At the end of a 4 hour absorption period approximately 95% of the sodium absorbed by bean plants was retained in the secondary roots. The sodium translocated to the shoot was retained in the stem.

2,4-Dinitrophenol decreased the amount retained in the secondary roots of bean plants and increased the amount translocated to the shoot. The stem retained most of the translocated sodium.

Bean plants without roots absorbed considerably more sodium than plants with roots and translocated a greater proportion of the sodium to the petioles and blades. 2,4-Dinitrophenol reduced the amount of sodium in the stem and petioles and increased the amount in the blades.

2,4-Dinitrophenol reduced the amount of sodium retained by the secondary roots of cotton plants but did not appreciably affect the amounts translocated to the shoot.

¹ Contribution from the United States Salinity Laboratory, Soil and Water Conservation Research Division, ARS, USDA, Riverside, California, in cooperation with the 17 Western States and Hawaii. Funds for the study were provided by the Office of Saline Water, United States Department of the Interior.