Effects of Decenylsuccinic Acid on 32P Uptake and Translocation by Barley and Winter Wheat

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Abstract
After 3 days of exposure to 10−3 and 10−4 M decenylsuccinic acid, winter wheat plants wilted and died. Decenylsuccinate at 10−3 M inhibited 32P uptake by barley roots and wheat roots and resulted in significant (P ≤ 0.05) leakage of previously absorbed 32P and total phosphorus (barley roots). Decenylsuccinate effects on 32P uptake and retention were attributed to increased permeability resulting from injury. Decenylsuccinate at 10−4 M did not inhibit root uptake of 32P but decreased movement into the shoot. This could be interpreted as an indication of reduced transpiration or inhibition of 32P loading into the transpiration stream. Decenylsuccinate did not increase cold hardiness in winter wheat in a nonhardening environment.