Effectiveness of plant growth promoting rhizobacteria in facilitating lead and nutrient uptake by little seed canary grass

Zaefarian, Faezeh; Vahidzadeh, Samaneh; Rahdari, Parvaneh; Rezvani, Mohammad; Zadeh, Hossein Ghani

doi:10.1590/s1806-99592012000300003

Cited by 11 publications

(6 citation statements)

References 43 publications

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“…In this regard, Zaefarian et al (2012) investigated the effectiveness of PGPR in the facilitation of Pb and nutrient uptake by littleseed canarygrass, reporting that the Pb TF value was >1 in the inoculated treatments with in the in the soil Pb concentration range of 200-400 mg/kg. However, the findings of the mentioned research indicated that in the Pb-polluted soil (> 800 mg/kg), the TF value was less than one even in the inoculated treatments [30]. Despite the contradictory reports regarding the effects of Pb toxicity on the plants Pb TF value [31,32], most of the findings have indicated that PGPG and AMF inoculation could reduce abiotic stress, such as heavy metal toxicity [33].…”

Section: Resultsmentioning

confidence: 97%

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Neighbor Presence of Plant Growth-promoting Rhizobacteria (PGPR) and Arbuscular Mycorrhizal Fungi (AMF) Can Increase Sorghum Phytoremediation Efficiency in a Soil Treated with Pb Polluted Cow Manure

Baghaie

Aghilizefreei

2019

J Hum Environ Health Promot

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accumulate in living organisms and plants [1]. These elements enter the environment mainly through anthropogenic sources, such as smelting processes, mining, fuel production, and industrial effluents [2]. Therefore, use of proper approached to the reduction of heavy metal availability is essential. Conventional remediation approaches for contaminated soils, sediments, and groundwater are based on the technologies that have been developed over the past two decades [3], including a wide variety of physical, chemical, and thermal treatment alternatives and their combinations, as well as engineering Background: The present study aimed to evaluate the effects of PGPR and AMF on the changes in sorghum phytoremediation efficiency in the soil amended with lead (Pb)polluted cow manure. Methods: Treatments consisted of applying two rates of Pb [0 (Pb0) and 800 (Pb800) mg/kg] polluted cow manure [0 (C0) and 30 (C30) t/ha], two levels of AMF [without (AMF-) and with (AMF+)] and PGPR (without (PGPR-) and with (PGPR+) inoculation. Pseudomonas sp. R9 was considered as a PGPR bacteria. The plant used in this experiment was sorghum. Plant Pb concentration was measured using atomic absorption spectroscopy. Results: The highest plant Pb concentration belonged to the cultivated plant in the soil treated with 30 t/ha Pb-polluted cow manure, while the lowest that was observed in the soil without amending cow manure in the absence of PGPR or AMF. The presence of AMF significantly increased the Pb translocation value and sorghum phytoremediation efficiency by 8% and 13.4%, respectively. Conclusion: According to the results, the inoculated plant with PGPR and AMF had positive effects on increasing Pb phytoremediation efficiency that, which is notable in environmental studies. However, the effects of soil chemical properties on Pb phytoremediation efficiency cannot be overlooked. * This work is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported License which allows users to read, copy, distribute and make derivative works for non-commercial purposes from the material, as long as the author of the original work is cited properly.

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Section: Resultsmentioning

confidence: 97%

“…According to the study by Zaefarian et al (2012) high concentrations of Pb in soil could significantly reduce the nitrogen content of plant roots [30]. In addition, rhizobacteria were reported to produce various growthpromoting hormones (e.g., auxins, gibberellins, and B vitamins), which stimulated root exudate production [30].…”

Section: Resultsmentioning

confidence: 99%

Neighbor Presence of Plant Growth-promoting Rhizobacteria (PGPR) and Arbuscular Mycorrhizal Fungi (AMF) Can Increase Sorghum Phytoremediation Efficiency in a Soil Treated with Pb Polluted Cow Manure

Baghaie

Aghilizefreei

2019

J Hum Environ Health Promot

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“…Furthermore, our results demonstrated that inoculation of plants with efficient and resistant PGPR, particulary with I1, I5 and I9, markedly affected plant agronomic parameters under Pb stress, most likely by alleviating Pb toxicity (Zaefarian et al . ), and increased plant biomass as compared to treatment without inoculation. The improvement in growth parameters in plants inoculated with I1, I5 and I9 could be due to the N fixation ability of R. leguminosarum (M5) and the important IAA production of Luteibacter sp., demonstrating the potential of these PGPR in producing growth‐promoting substances in L. sativus .…”

Section: Discussionmentioning

confidence: 94%

“…Moreover, Pb can directly affect cell elongation by inhibiting cell wall enzymes and the plasmalemma ATPase by dampening electron translocation during photosynthesis and respiration, thus reducing plant growth (Zaefarian et al . ). It is interesting to note that roots were more infuenced by Pb stress than aerial plant parts, which might be due to the higher accumulation of Pb in L. sativus roots (Brunet et al .…”

Section: Discussionmentioning

confidence: 97%

Potential of efficient and resistant plant growth‐promoting rhizobacteria in lead uptake and plant defence stimulation in Lathyrus sativus under lead stress

et al. 2018

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The ability of plant growth-promoting rhizobacteria (PGPR) to enhance Lathyrus sativus tolerance to lead (Pb) stress was investigated. Ten consortia formed by mixing four efficient and Pb-resistant PGPR strains were assessed for their beneficial effect in improving Pb (0.5 mM) uptake and in inducing the host defence system of L. sativus under hydroponic conditions based on various physiological and biochemical parameters. Lead stress significantly decreased shoot (SDW) and root (RDW) dry weight, but PGPR inoculation improved both dry weights, with highest increases in SDW and RDW of plants inoculated with I5 (R. leguminosarum (M5) + P. fluorescens (K23) + Luteibacter sp. + Variovorax sp.) and I9 (R. leguminosarum (M5) + Variovorax sp. + Luteibacter sp. + S. meliloti) by 151% and 94%, respectively. Additionally, inoculation significantly enhanced both chlorophyll and soluble sugar content, mainly in I5 inoculated leaves by 238% and 71%, respectively, despite the fact that Pb decreased these parameters. We also found that PGPR inoculation helps to reduce oxidative damage and enhances antioxidant enzyme activity, phenolic compound biosynthesis, carotenoids and proline content. PGPR inoculation increased Pb uptake in L. sativus, with highest increase in shoots of plants inoculated with I5 and I7, and in roots and nodules of plants inoculated with I1. Moreover, PGPR inoculation enhanced mineral homeostasis for Ca, Cu and Zn under Pb stress, mainly in plants inoculated with I1, I5, I7 and I9. Results of our study suggest the potential of efficient and Pb-resistant PGPR in alleviating harmful effects of metal stress via activation of various defence mechanisms and enhancing Pb uptake that promotes tolerance of L. sativus to Pb stress.

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“…Several studies have demonstrated that Pb 2+ not only can affect physiological and biochemical reactions in plants, but can also induce numerous adverse responses in animals and humans [4][5][6][7]. The molecular mechanism of Pb toxicity has attracted a lot of attention in the fi eld of abiotic stress research.…”

Section: Introductionmentioning

confidence: 99%

Nitric Oxide Modulates Lead Content during Lead-Induced Cell Killing in Yeast Cells

Zhang

2018

Pol. J. Environ. Stud.

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In this study we investigated the role of NO in Pb-induced yeast cell death. We found that the rate of cell death increased with increasing concentrations of Pb(NO 3 ) 2 and prolonged exposure to Pb(NO 3 ) 2 . NO production also increased signifi cantly during Pb-induced yeast cell death. An exogenous NO donor increased Pb toxicity to cells, while NO synthesis inhibitors and NO-specifi c scavengers alleviated Pb toxicity. To further investigate the mechanism of NO in Pb toxicity, we measured the Pb content and mRNA expression of metal ion transport gene SMF1 in yeast cells. Our results showed that endogenous NO may enhance SMF1 expression, thereby increasing Pb content in yeast cells. Meanwhile, we found that the intracellular ROS levels increased with the increase of intracellular Pb content in yeast cells. Conclusion: Pb can promote the increase of intracellular nitric oxide levels. NO may promote intracellular Pb transport by enhancing the expression of SMF1 in Pb-induced yeast cell death. Intracellular accumulation of Pb further promotes the increase of intracellular ROS levels, and then lead to yeast cell death by oxidative damage.

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Effectiveness of plant growth promoting rhizobacteria in facilitating lead and nutrient uptake by little seed canary grass

Cited by 11 publications

References 43 publications

Neighbor Presence of Plant Growth-promoting Rhizobacteria (PGPR) and Arbuscular Mycorrhizal Fungi (AMF) Can Increase Sorghum Phytoremediation Efficiency in a Soil Treated with Pb Polluted Cow Manure

Neighbor Presence of Plant Growth-promoting Rhizobacteria (PGPR) and Arbuscular Mycorrhizal Fungi (AMF) Can Increase Sorghum Phytoremediation Efficiency in a Soil Treated with Pb Polluted Cow Manure

Potential of efficient and resistant plant growth‐promoting rhizobacteria in lead uptake and plant defence stimulation in Lathyrus sativus under lead stress

Nitric Oxide Modulates Lead Content during Lead-Induced Cell Killing in Yeast Cells

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