4种植物激素对向日葵富集U和Cd的影响

Effect of four kinds of phytohormones on U and Cd accumulation in Helianthus annuus

为探讨植物激素对植物修复的影响,采用模拟土壤铀、镉污染的盆栽实验,研究外施4种植物激素(IAA、GA3、6-BA、EBL)对向日葵吸收、转运、积累U和Cd的影响。结果表明:植物激素可促进向日葵对U和Cd的吸收,在100 mg·L^(-1)IAA处理下,单株U含量比对照提高了162%,达到14.74 mg·kg^(-1)DW,在500 mg·L^(-1)GA3处理下,单株Cd含量比对照提高了17%,达到34.20 mg·kg^(-1)DW。植物激素抑制了向日葵从根部转运U至地上部,U转运系数降低至对照的15.4%~97.4%。植物激素增强了向日葵对U和Cd的积累,在250 mg·L^(-1)GA3处理时,单株U积累量最高,达到206.43μg,比对照提高了179%;单株Cd积累量在50 mg·L^(-1)6-BA处理时最高,达到453.17μg,比对照提高了81%。因此,施加适宜浓度的植物激素可以增强向日葵对U、Cd污染的修复效果。

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 of H.annuus by 162% up to 14.74 mg·kg（-1）DW,and applying500 mg·L（-1）GA3 increased the Cd content of H.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.