不同根际促生菌对亚麻镉砷富集及植株生长的影响

Study on Different Rhizosphere Growth-Promoting Bacteria on Agronomic Characters and Heavy Metal Cadmium and Arsenic Enrichment of Flax

为研究植物根际促生菌(plant growth promoting rhizobacteria,PGPR)对亚麻(Linum usitatissimum.L)植株富集和转移重金属污染农田中Cd、As元素效率的影响,取湖南省浏阳市永和镇矿山周围农田土壤进行盆栽试验,研究4种根际促生菌处理下亚麻株高、根长、茎粗和干茎、根重等表型指标的变化情况,以及Cd、As的富集和转移特征。结果表明:4种植物根际促生菌对亚麻的株高和根长均有不同程度的促进作用,对茎粗没有显著影响。GY16对亚麻根长、茎粗、植株鲜重和株数、干重等指标的促进效果较其他菌更显著;施菌处理下亚麻根部对Cd、As的富集量显著增高。这2种菌可联合使用作为亚麻-根际促生菌联合修复污染土壤的候选菌剂。研究表明,根际促生菌的加入提高了亚麻对重度Cd、As污染农田的修复效果。

In order to study the enrichment and transfer efficiency of Cd and As in flax(Linum usitatissimum.L)plants growing in heavy metal contaminated farmland with plant growth promoting rhizobacteria(PGPR).Pot experiment was carried out using farmland soil contaminated by heavy metals from Yonghe Town,Liuyang City,Hunan Province.The variation of plant height,root length,stem thickness,straw and root weight of flax,as well as thecharacteristics of Cd and As enrichment and transportation were detected.The results showed that four kinds of rhizobacteria had different effects on the plant height and root length of flax,but no significant effect on the diameter of plant.GY16 microbial agent(abbreviation of Bacillus subtilis)has the best promotion effect on root length,stem thickness,plant fresh weight and plant number,dry weight and other indicators;Inoculum(abbreviation of Pseudomonas stutzeri)has the best effect on the concentration of As.GY16 and Inoculum can be used as candidate microbial agent for phytoremediation of heavy metal contaminated soil.This study confirmed that the plant growth promoting rhizobacteria improves the remediation effect of flax on heavy metal scontaminated soil.