Abstract:

Abstract: Rice cultivars of Xiangzaoxian32 and Han116 were used as experimental materials, the effects of exogenous D-Arg on the polyamine contents and drought-resistance of rice seedlings under osmotic stress were investigated.The results showed exogenous D-Arg treatment significantly inhibited seedling relative dry weight increase rate and the contents of Put, Spd and Spm in seedling roots ,but did not significantly effect height relative increase rate. Exogenous D-Arg+Put could markedly promote seedling relative dry weight increase rate and the contents of Put, Spd and Spm in seedling roots and height relative increase rate. It indicated that exogenous D-Arg decreased drought-resistance of rice seedlings,and Put could reverse the effects of D-Arg.