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Potential Plant Growth-Promoting Bacteria with Heavy Metal Resistance
Current Microbiology ( IF 2.6 ) Pub Date : 2020-09-22 , DOI: 10.1007/s00284-020-02208-8
Derya Efe 1
Affiliation  

Plant growth-promoting (PGP) bacteria commonly have many strategies to cope with heavy metal toxicity. Heavy metal-resistant PGP bacteria can be used to improve the growth of plants in heavy metal contaminated soils. In this study, the soil samples were collected from the lead-zinc mineral deposits in Gümüşhane Province, Turkey. Nine bacterial isolates were obtained on the nutrient agar medium supplemented with 100 mg/mL zinc and lead. All of the isolates were screened in terms of plant growth-promoting characteristics including production of indole-3-acetic acid and siderophore, nitrogen fixation and phosphate solubilisation. Nine bacteria were identified as Bacillus cereus, Bacillus atrophaeus, Bacillus pumilus, Bacillus amyloliquefaciens, Bacillus tropicus, Bacillus subtilis, Bacillus halotolerans, Bacillus vallismortis, and Enterococcus mundtii by classical and 16S rDNA-PCR assays. In addition, these isolates were evaluated for their response to three heavy metals (lead, zinc, copper) dominant in the soil samples and minimal inhibitory concentration (MIC) of the heavy metals was determined with plate dilution method. Consequently, the bacterial isolates in this study possess plant growth-promoting traits and can ameliorate heavy metal contaminated soil. E. mundtii was reported to be found in heavy metal contaminated soil for the first time. This study is the first report about PGP characteristics (IAA production and phosphate solubilisation) of B. vallismortis.

中文翻译:

具有重金属抗性的潜在植物促生长菌

植物生长促进 (PGP) 细菌通常有许多应对重金属毒性的策略。抗重金属PGP菌可用于改善重金属污染土壤中植物的生长。在这项研究中,土壤样品是从土耳其 Gümüşhane 省的铅锌矿床中收集的。在补充有 100 mg/mL 锌和铅的营养琼脂培养基上获得了 9 个细菌分离株。根据促进植物生长的特性筛选所有分离株,包括产生吲哚-3-乙酸和铁载体、固氮和增溶磷酸盐。9 种细菌被鉴定为蜡样芽孢杆菌、萎缩芽孢杆菌、短小芽孢杆菌、解淀粉芽孢杆菌、热带芽孢杆菌、枯草芽孢杆菌、耐盐芽孢杆菌、山谷芽孢杆菌、和肠球菌通过经典和 16S rDNA-PCR 检测。此外,还评估了这些分离株对土壤样品中占主导地位的三种重金属(铅、锌、铜)的反应,并用平板稀释法测定了重金属的最小抑菌浓度 (MIC)。因此,本研究中的细菌分离物具有促进植物生长的特性,可以改善重金属污染的土壤。据报道,E. mundtii 首次在重金属污染的土壤中被发现。本研究是关于 B. vallismortis 的 PGP 特性(IAA 产生和磷酸盐溶解)的第一份报告。铜)在土壤样品中占主导地位,重金属的最小抑菌浓度(MIC)采用平板稀释法测定。因此,本研究中的细菌分离物具有促进植物生长的特性,可以改善重金属污染的土壤。据报道,E. mundtii 首次在重金属污染的土壤中被发现。本研究是关于 B. vallismortis 的 PGP 特性(IAA 产生和磷酸盐溶解)的第一份报告。铜)在土壤样品中占主导地位,重金属的最小抑菌浓度(MIC)采用平板稀释法测定。因此,本研究中的细菌分离物具有促进植物生长的特性,可以改善重金属污染的土壤。据报道,E. mundtii 首次在重金属污染的土壤中被发现。本研究是关于 B. vallismortis 的 PGP 特性(IAA 产生和磷酸盐溶解)的第一份报告。
更新日期:2020-09-22
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