Astragalus membranaceus could accumulate selenium (Se) generally

but the uptake and translocation Se in this plant are still not clear. The soil pot experiment was conducted to explore the effects of different concentrations (0

2

4

6

8 mg/kg soil) as sodium selenite (SeIV) and sodium selenate (SeVI) added in soil on Se uptake

translocation and accumulation in Astragalus membranaceus. The results showed that the application of Se at the rate of 2～6 mg/kg as SeIV increased the shoots and roots dry weights of Astragalus membranaceus by 34.55%～38.24%

compared to the control

whereas the application of Se with more than 2 mg/kg as SeVI inhibited the growth of Astragalus membranaceus. Moreover

the application of different concentrations Se as SeVI and SeIV increased Se concentrations in the shoots and roots

and there were the significant and positive relationships between Se concentrations added in soil and that in plants (SeVI: r=0.884**; SeIV: r=0.973**). With the increasing of Se application rates

the Se uptake capacity of Astragalus membranaceus was higher than the control

and the bioaccumulation factors and transfer factors were more than 1

and Se concentrations in plant shoots were higher than those of roots

which indicated that exogenous Se might improve the uptake and transport of selenium in Astragalus membranaceus. In conclusion

sodium of selenite and selenate added in the soil with pH＞7.0 could enhanced the uptake

transport and accumulation of Se in Astragalus membranaceus

and the application of 2～6 mg/kg in soil would be better for the growth of this plant and Se accumulation in the shoots and roots.