Screening of multi-metal tolerant plant growth promoting bacteria (PGPB) Stutzerimonas stutzeri WA4 and its assistance on phytoextraction of heavy metals (Cu, Ag and Pb).

IF 3.4 4区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

International Journal of Phytoremediation Pub Date : 2024-11-13 DOI:10.1080/15226514.2024.2427384

Koushika Saravanan, Kavya Vellingiri, Preethi Kathirvel

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Abstract

In the current study, coal fly ash contaminated soil was collected in and around Mettur Thermal Power Station, Salem district, Tamil Nadu. The metal concentrations present in the coal fly ash soil samples were analyzed and also used for the isolation of bacteria. The isolates were screened for their multi-metal resistance against three heavy metals (Cu, Ag and Pb) and plant growth-promoting traits (siderophore, phosphate solubilization, IAA, cellulase, HCN, and ammonia production). Among the 12 isolates, the WA4 strain revealed promising results for both metal-resistant and plant growth-promoting activity. In the in vitro pot experiment, Spinacia oleracea (Palak), Red amaranth (Red spinach), Capsicum annum (Green chilly) and Solanum melongena (Brinjal) plants were grown in ash-contaminated soil treated with different concentrations of selected bacterial inoculum (25%, 50%, 75% and 100%) along with a control pot. The results of the study indicated that the ash-contaminated soil treated with bacterial inoculum distinctly increased the growth of plants when compared to untreated soil (control). Thus, the best-performing strain WA4 could be utilized as a good bio-stimulant for promoting the growth of selected plants in the re-vegetation programs of ash-contaminated soil.

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多金属耐受性植物生长促进菌（PGPB）Stutzerimonas stutzeri WA4 的筛选及其对重金属（铜、银和铅）植物萃取的帮助。

本研究在泰米尔纳德邦塞勒姆地区梅图尔热电站及其周围收集了受粉煤灰污染的土壤。对粉煤灰土壤样本中的金属浓度进行了分析，并用于分离细菌。对分离菌株进行了筛选，以检测其对三种重金属（铜、银和铅）的多金属抗性以及促进植物生长的性状（苷元、磷酸盐溶解、IAA、纤维素酶、HCN 和氨的产生）。在这 12 个分离株中，WA4 菌株在抗金属和促进植物生长活性方面都表现出良好的结果。在离体盆栽实验中，将菠菜（Palak）、红苋菜（Red spinach）、辣椒（Green chilly）和茄子（Solanum melongena）等植物种植在用不同浓度的选定细菌接种体（25%、50%、75% 和 100%）处理过的受灰尘污染的土壤中，同时使用一个对照盆栽。研究结果表明，与未经处理的土壤（对照）相比，用细菌接种体处理过的灰分污染土壤明显提高了植物的生长速度。因此，表现最好的菌株 WA4 可以作为一种良好的生物刺激剂，在灰烬污染土壤的植被恢复计划中促进选定植物的生长。

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来源期刊

International Journal of Phytoremediation 环境科学-环境科学

CiteScore

7.60

自引率

5.40%

发文量

145

审稿时长

3.4 months

期刊介绍： The International Journal of Phytoremediation (IJP) is the first journal devoted to the publication of laboratory and field research describing the use of plant systems to solve environmental problems by enabling the remediation of soil, water, and air quality and by restoring ecosystem services in managed landscapes. Traditional phytoremediation has largely focused on soil and groundwater clean-up of hazardous contaminants. Phytotechnology expands this umbrella to include many of the natural resource management challenges we face in cities, on farms, and other landscapes more integrated with daily public activities. Wetlands that treat wastewater, rain gardens that treat stormwater, poplar tree plantings that contain pollutants, urban tree canopies that treat air pollution, and specialized plants that treat decommissioned mine sites are just a few examples of phytotechnologies.