Abstract: Effects of Cd²⁺ stress on growth,protective enzymes,MDA content,Cd²⁺ content and photosynthetic characters of rice were studied.The results show that in the rice seedlings of Shanyou-63 under Cd²⁺ stress,the electron activity of PSⅡ and the photosynthetic rate decreased;the content of MDA increased;the activities of protective enzymes increased at first and decreased afterwards,whereas in the rice seedlings of Liangyoupeijiu,in comparison,the activity of protective enzymes was relatively higher;the rising rate of MDA was lower;the photosynthetic rate and the electron activity of PSⅡ declined at a lower rate;The Cd²⁺ content was lower in the aerial part and higher in the underground part.The experiment demonstrates that Liangyoupeijiu is more tolerant to Cd²⁺ pollution than Shanyou 63. 

Key words: Cd²⁺Liangyoupeijiu, Shanyou 63, stress, resistance physiology