《Table 5 Effects of arsenic (As) and As+phosphorus (P) treatments on root reduced glutathione (GSSG)

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

The contents of GSSG，total GSH，and the GSH/GSSG ratio are presented in Table 5.ZDB475 had higher GSSG content than ZDB160 when both genotypes were exposed to As treatment，while exogenous application of P caused reduction of these parameter values in both genotypes，with ZDB475 being much more affected than ZDB160.As treatment had little effect on the total GSH content in ZDB475，but increased by 1.44-fold in ZDB160 in comparison with the control.Although P addition induced a more increase of total GSH content in ZDB160 than in ZDB475，the increase was comparable compared to As treatment alone.As treatment induced a drastic reduction in the GSH/GSSG ratio in ZDB475，while it had relatively small effect on ZDB160.Remarkable increase in the GSH/GSSG ratio was detected upon P addition，with ZDB160having much more increase than ZDB475.