外源ABA对镉胁迫下柳枝稷生理特性及镉吸收的影响

为探究外源脱落酸(Abscisic acid,ABA)缓解柳枝稷(Panicum virgatum)镉(Cd)毒害效应及可能产生的生理机制,本试验以2个柳枝稷品种'Alamo'与'Cave in Rock'为材料,在水培条件下,研究了外源1μmol·L-1 ABA预处理对20μmol·L-1镉(Cd2+)胁迫下柳枝稷幼...

Effects of Exogenous ABA on Physiological Characteristics and Cadmium Uptake of Switchgrass under Cadmium Stress

To investigate the effects of exogenous ABA(Abscisic acid,ABA)on alleviating cadmium toxicity in switchgrass(Panicum virgatum)and its possible physiological mechanisms,two switchgrass varieties‘Alamo’and‘Cave in Rock’were used in the experiment.The effects of 1μmol·L^-1(ABA)pretreatment on biomass,root morphology,membrane lipid peroxidation and proline of switchgrass seedlings under hydroponic culture conditions with addition 20μmol·L^-1 Cd²⁺ were investigated.The results showed that Cd significantly inhibited the growth of switchgrass.‘Cave in Rock’was more tolerant to Cd than‘Alamo’,but‘Alamo’had a higher Cd accumulation and translocation capacity than‘Cave in Rock’.Compared with Cd stress alone,1μmol·L^-1ABA pretreatment significantly increased root length,root surface area and root tip number,increased root vigour,proline(Pro)and relative water content of leaves,reduced malondialdehyde(MDA)content in the plant and promoted Cd uptake of‘Alamo’.The results suggest that planting‘Alamo’and treating it with low concentrations of ABA is recommended on Cd-contaminated land to promote plant growth while improving the remediation of Cd-contaminated soil.