The radiation protective effect of sinapine, which is widely distributed in Cruciferae, on wheat and barley was reported by my foregoing article. The hydrolysis products of sinapine are sinapic acid and choline. For searching the effective parts of sinapine in radiation protection, the germinating wheat seeds were treated with choline chloride before irradiation, then they were irradiated with X ray. The growth of wheat(6 days after irradiation) showed that choline chloride had not protective effect on germinating wheat seeds.