Zhang Zhen-yu;Meng Jun;Dang Shu;Chen Wen-fu

Shenyang Agr Univ, Key Lab Rice Biol & Breeding, Key Lab Northern Japonica Super Rice Breeding, Minist Agr,Minist Educ,Rice Res Inst, Shenyang 110866, Peoples R China;Liaoning Biochar Engn & Technol Res Ctr, Shenyang 110866, Peoples R China

super japonica rice;biochar;cadmium stress;cadmium accumulation

It is of great importance to solve the threats induced by cadmium pollution on crops. This paper examined the effect of biochar on cadmium accumulation in japonica rice and revealed the mechanism underlying the response of protective enzyme system to cadmium stress. Biochar derived from rice straw was applied at two application rates under three cadmium concentrations. Shermong 265, super japonica rice variety, was selected as the test crop. The results indicated that cadmium content in above-ground biomass of rice increased with increasing soil cadmium concentrations, but the biochar application could suppress the accumulation of cadmium to some extent. Under high concentrations of cadmium, content of free proline and MDA (malondialdehyde) were high, so did the SOD (superoxide dismutase), POD (peroxidase) and CAT (catalase) activity in the flag leaf of rice. However, the protective enzyme activities remained at low level when biochar was added.