Effect of four kinds of phytohormones on U and Cd accumulation in Helianthus annuus
Soil pollution from uranium tailings was simulated in the laboratory,and a pot experiment was performed to study the effects of phytohormones (3-indolyl acetic acid,IAA;gibberellic acid 3,GA3;6-benzylaminopurine,6-BA;epibrassinolide,EBL) on U and Cd extraction,transportation,and accumulation in Helianthus annuus.The result showed that phytohormones had a positive effect on U and Cd uptake in H.annuus.An addition of 100 mg · L-1 3-IAA increased the U content ofH.annuus by 162％ up to 14.74 mg · kg-1 DW,and applying 500 mg · L-1 GA3 increased the Cd content ofH.annuus by 17％ up to 34.20 mg · kg-1 DW compared with the control,respectively.However,phytohormones inhibited transporting U from roots to shoots,and the translocation factor was reduced from 15.4％ to 97.4％.Phytohormones also had a positive effect on U and Cd accumulation in H.annuus.Applying 250 mg · L-1 GA3 and 50 mg · L-1 6-BA increased U bioaccumulation by 179％ and Cd bioaccumulation by 81％,reaching to 206.43 μg U and 453.17 μg Cd per plant,respectively.These resultsed suggested that phytohormones could improve the effectiveness of phytoremediation with H.annuus in soil contaminated with U and Cd.
国家科技期刊平台
NSTL
万方数据
维普
