Effects of decenylsuccinic Acid on p uptake and translocation by barley and winter wheat.

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 (32)P uptake by barley roots and wheat roots and resulted in significant (P </= 0.05) leakage of previously absorbed (32)P and total phosphorus (barley roots). Decenylsuccinate effects on (32)P uptake and retention were attributed to increased permeability resulting from injury. Decenylsuccinate at 10(-4) M did not inhibit root uptake of (32)P but decreased movement into the shoot. This could be interpreted as an indication of reduced transpiration or inhibition of (32)P loading into the transpiration stream. Decenylsuccinate did not increase cold hardiness in winter wheat in a nonhardening environment.