《Table 2 Effects of arsenic (As) and As+phosphorus (P) treatments on plant biomass of 2 barley genot

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《"Alleviation of arsenic toxicity by phosphate is associated with its regulation of detoxification,defense,and transport gene expression in barley"》

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1) C，control；As，As（100 mol L–1）；As+P，As（100μmol L–1）+P（50μmol L–1）；G，genotype.Different letters within a column indicate significant difference at P<0.05；***，significant difference at P<0.001.

The activities of SOD and CAT in the two barley genotypes as affected by different treatments are shown in Table 4.In general，there were significant differences in the activities of the 2 enzymes，with ZDB475 having higher SOD activity and ZDB160 having higher CAT activity.As treatment caused the significant increase in the activities of both anti-oxidative enzymes，with ZDB160 having more increase than ZDB475.Hence，SOD and CAT activities of ZDB160 increased by 1.62and 1.75 folds for As treatment in comparison to control，respectively，while those of ZDB475 increased by 1.21and 6.1 folds，respectively.No significant difference was detected in SOD activity between As and As+P treatments for ZDB475，while ZDB160 decreased by 1.39 folds.Similarly，P addition also reduced CAT activity，with ZDB475 being more affected than ZDB160.The significant differences between genotypes were much more pronounced in CAT in contrast to SOD signifying a difference in the mechanisms between the genotypes in their responses to cope with As and P.