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首页> 外文期刊>Ecotoxicology and Environmental Safety >Rhizoremediation prospects of Polyaromatic hydrocarbon degrading rhizobacteria, that facilitate glutathione and glutathione-S-transferase mediated stress response, and enhance growth of rice plants in pyrene contaminated soil
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Rhizoremediation prospects of Polyaromatic hydrocarbon degrading rhizobacteria, that facilitate glutathione and glutathione-S-transferase mediated stress response, and enhance growth of rice plants in pyrene contaminated soil

机译：多环芳烃降解根瘤菌的根际修复前景，可促进谷胱甘肽和谷胱甘肽-S-转移酶介导的胁迫反应，并增强pyr污染土壤中水稻的生长

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Rhizoremediation is a strategy where pollutant degrading bacteria are augmented through plant roots using plant-microbe interaction. Therefore, for effective rhizoremediation of pyrene contaminated soil, bacterial strains were experimented for amelioration of stress response in host plant along with biodegradation ability. A total of 28 bacteria, having ability to degrade polycyclic aromatic hydrocarbons were isolated from contaminated sites and checked for their plant growth promoting attributes, such as indole acetic acid (IAA) production, phosphate solubilization, atmospheric nitrogen fixation and siderophore release. Among these isolates, Klebsiella pneumoniae AWD5 was found to degrade 60% of pyrene. While other isolates, i.e. Alcaligenes faecalis BDB4, Pseudomonas fragi DBC, Pseudomonas aeruginosa PDB1, Acinetobactor sp. PDB4 degraded 48.5%, 50.29%, 31.3% and 36% of pyrene, respectively, after 6 days of incubation. K. pneumoniae AWD5 produced 94.2 mu g/ml IAA and 3.1 mM/mg/h unit of ACC deaminase, which was best among eighteen indole acetic acid producers and five of the 1-aminocyclopropane-1-carboxylate (ACC) deaminase producing isolates. P. aeruginosa PDB1 resulted in highest phosphate solubilization activity of 875.26 ng/ml of soluble phosphate among seven phosphate solubilizers. The isolates AWD5 and PDB1 both have shown a good amount of siderophore release (56.3% and 84.3% unit). There was 19.1% increase in shoot length of rice seedlings treated with PDB1 in presence of pyrene. Similarly, 26.5% increase in the root length of AWD5 treated rice was recorded in pyrene contaminated soil. Bacterial inoculation also induced and improved the stress response in host plant, in presence of pyrene, as suggested by the superoxide dismutase, glutathione and glutathione-S-transferase activities in rice.
机译：根际修复是一种利用植物-微生物相互作用通过植物根部增加降解污染物细菌的策略。因此，为了有效地根除of污染的土壤，对细菌菌株进行了实验，以改善宿主植物的胁迫反应以及生物降解能力。从受污染的地点分离出总共28种具有降解多环芳烃能力的细菌，并检查其促进植物生长的特性，例如吲哚乙酸（IAA）的产生，磷酸盐的溶解，大气固氮和铁载体的释放。在这些分离物中，发现肺炎克雷伯菌AWD5降解了60％的pyr。而其他分离株，即粪便产碱杆菌BDB4，脆弱假单胞菌DBC，铜绿假单胞菌PDB1，不动杆菌属。孵育6天后，PDB4分别降解了48.5％，50.29％，31​​.3％和36％的of。肺炎克雷伯菌AWD5产生94.2μg/ ml IAA和3.1 mM / mg / h单位的ACC脱氨酶，在18个吲哚乙酸生产者和5个1-氨基环丙烷-1-羧酸酯（ACC）脱氨酶生产菌株中表现最好。在7种磷酸盐增溶剂中，铜绿假单胞菌PDB1的最高磷酸盐增溶活性为875.26 ng / ml可溶性磷酸盐。分离株AWD5和PDB1均显示出大量的铁载体释放（56.3％和84.3％单位）。在DB存在下，用PDB1处理的水稻幼苗的茎长增加了19.1％。同样，在pyr污染的土壤中，经AWD5处理的水稻的根长增加了26.5％。水稻中超氧化物歧化酶，谷胱甘肽和谷胱甘肽-S-转移酶的活性表明，在of存在下，细菌接种还诱导并改善了寄主植物的胁迫反应。

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