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首页> 外文期刊>Plant and Soil >Effect of Cd-tolerant plant growth-promoting rhizobium on plant growth and Cd uptake by Lolium multiflorum Lam. and Glycine max (L.) Merr. in Cd-contaminated soil
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Effect of Cd-tolerant plant growth-promoting rhizobium on plant growth and Cd uptake by Lolium multiflorum Lam. and Glycine max (L.) Merr. in Cd-contaminated soil

机译：耐镉促进植物生长的根瘤菌对何首乌黑麦草生长和镉吸收的影响。和Glycine max（L.）Merr。在镉污染的土壤中

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Plant growth-promoting rhizobacteria (PGPR) have been widely studied for agricultural applications. One aim of this study was to isolate cadmium (Cd)-tolerant bacteria from nodules of Glycine max (L.) Merr. grown in heavy metal-contaminated soil in southwest of China. The plant growth-promoting (PGP) traits and the effects of the isolate on plant growth and Cd uptake by legume and non-legume plants in Cd-polluted soil were investigated. Cd-tolerant bacteria were isolated by selective media. The isolates were identified by 16S rRNA gene and phylogenetic analysis. The PGR traits of the isolates were evaluated in vitro. Cd in soil and plant samples was determined by ICP-MS. One of the most Cd-tolerant bacteria simultaneously exhibited several PGP traits. Inoculation with the PGPR strain had positive impacts on contents of photosynthesis pigments and mineral nutrients (Fe or Mg) in plant leaves. The shoot dry weights of Lolium multiflorum Lam. increased significantly compared to uninoculated control. Furthermore, inoculation with the PGPR strain increased the Cd concentrations in root of L. multiflorum Lam. and extractable Cd concentrations in the rhizosphere, while the Cd concentrations in root and shoot of G. max (L.) Merr. significantly decreased. This study indicates that inoculation with Cd-tolerant PGPR can alleviate Cd toxicity to the plants, increase Cd accumulation in L. multiflorum Lam. by enhancing Cd availability in soils and plant biomass, but decrease Cd accumulation in G. max (L.) Merr. by increasing Fe availability, thus highlighting new insight into the exploration of PGPR on Cd-contaminated soil.
机译：促进植物生长的根际细菌（PGPR）已广泛用于农业应用。这项研究的目的是从最大大豆（Glycine max（L.）Merr）结节中分离出耐镉（Cd）的细菌。生长在中国西南部重金属污染的土壤中。研究了植物生长促进（PGP）性状以及分离株对Cd污染土壤中豆类和非豆类植物生长和Cd吸收的影响。通过选择培养基分离出耐镉细菌。通过16S rRNA基因和系统发育分析鉴定分离物。在体外评估了分离株的PGR性状。通过ICP-MS测定土壤和植物样品中的镉。镉耐受性最高的细菌之一同时表现出几种PGP性状。 PGPR菌株的接种对植物叶片中光合作用色素和矿质营养素（铁或镁）的含量有积极影响。多花黑麦草的茎干重量。与未接种的对照相比，显着增加。此外，用PGPR菌株接种增加了何首乌的根中的Cd浓度。根际中可提取的Cd浓度，而G. max（L.）Merr的根和茎中的Cd浓度。明显减少。这项研究表明，用耐Cd的PGPR进行接种可以减轻Cd对植物的毒性，增加多花木耳中Cd的积累。通过提高土壤和植物生物量中Cd的利用率，但减少G. max（L.）Merr中Cd的积累。通过增加铁的可利用性，从而突出了对在Cd污染的土壤上进行PGPR勘探的新见识。

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