Inoculating Helianthus annuus (sunflower) grown in zinc and cadmium contaminated soils with plant growth promoting bacteria – Effects on phytoremediation strategies

Marques, Ana P. G. C.; Moreira, Helena; Franco, Albina R.; Rangel, António O.S.S.; Castro, Paula M. L.

doi:10.1016/j.chemosphere.2013.02.055

Cited by 161 publications

(52 citation statements)

References 52 publications

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“…Ralstonia taiwanensis, isolated originally from Mimosa nodules (Chen et al 2001), and shown to be a bona fide Mimosa symbiont (Chen et al 2003), was renamed Cupriavidus taiwanensis. In addition to the beneficial effect of promoting legume growth by means of N 2 fixation, some Cupriavidus strains are resistant to heavy-metal contamination in soil, making them ideal candidates for use as bioinoculants in areas in need of remediation (Marques et al 2013;Oves et al 2010). Nodulating strains of Cupriavidus contain nodA (Chen et al 2005) and other nod genes.…”

Section: Rhizobial and Nonrhizobial Bacteria That Fix Nitrogen And Nomentioning

confidence: 99%

The Nodule Microbiome: N₂-Fixing Rhizobia Do Not Live Alone

Martínez‐Hidalgo

Hirsch

2017

Phytobiomes Journal

246

163

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For decades, rhizobia were thought to be the only nitrogen-fixing inhabitants of legume nodules, and biases in culture techniques prolonged this belief. However, other bacteria, which are not typical rhizobia, are often detected within nodules obtained from soil, thus revealing the existence of a phytomicrobiome where the interaction among the individuals is not only complex, but also likely to affect the behavior and fitness of the host plant. Many of these nonrhizobial bacteria are nitrogen fixers, and some also induce nitrogen-fixing nodules on legume roots. Even more striking is the incredibly diverse population of bacteria residing within nodules that elicit neither nodulation nor nitrogen fixation. Yet, this community exists within the nodule, albeit clearly out-numbered by nitrogen-fixing rhizobia. Few studies of the function of these nodule-associated bacteria in nodules have been performed, and to date, it is not known whether their presence in nodules is biologically important or not. Do they confer any benefits to the Rhizobium-legume nitrogen-fixing symbiosis, or are they parasites/saprophytes, contaminants, or commensals? In this review, we highlight the lesser-known bacteria that dwell within nitrogen-fixing nodules and discuss their possible role in this enclosed community as well as any likely benefits to the host plant or to the rhizobial inhabitants of the nodule. Although many of these nodule inhabitants are not capable of nitrogen fixation, they have the potential to enhance legume survival especially under conditions of environmental stress. This knowledge will be useful in defining strategies to employ these bacteria as bioinoculants by themselves or combined with rhizobia. Such an approach will enhance rhizobial performance or persistence as well as decrease the usage of chemical fertilizers and pesticides.

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Section: Rhizobial and Nonrhizobial Bacteria That Fix Nitrogen And Nomentioning

confidence: 99%

The Nodule Microbiome: N₂-Fixing Rhizobia Do Not Live Alone

Martínez‐Hidalgo

Hirsch

2017

Phytobiomes Journal

246

163

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“…Similar enhancement in some cereals, for example, wheat following metal-tolerant PGPR, B. thuringiensis and P. fluorescens (Shahzadi et al 2013) and A. brasilense and A. chroococcum (Janmohammadi et al 2013), has been reported. The PGPR Ralstonia eutropha (B1) and Chryseobacterium humi (B2) inoculated sunflower (Helianthus annuus) plants when grown in Zn-and Cd-contaminated soil had decreased metal concentration inside plant tissues, suggesting that metal-resistant PGPR might have served as effective stabilizers for plants grown in metalcontaminated soil (Marques et al 2013). …”

Section: Metal Stressmentioning

confidence: 97%

Microbial Consortium of Plant Growth-Promoting Rhizobacteria Improves the Performance of Plants Growing in Stressed Soils: An Overview

Panwar

Tewari²,

Nayyar³

2014

Phosphate Solubilizing Microorganisms

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Soil and associated stress conditions not only influence dwelling microbial populations and soil ecosystems but also affect growth and yield of plants. Major soil stress includes salinity, drought, and metal contamination. Due to burgeoning populations and expanding food demands, it has become imperative to alleviate the stressful soil conditions so that the crop production is increased and, consequently, the food demands are fulfilled. Different strategies are followed to resolve this problem, and one such approach involves exploiting microbial potential for plant's benefit. The multifunctional microscopic life-forms are already known for their applications in industries, medicine, and agricultural field. One of the major attributes of microbes from agronomic point of view is their ability to solubilize difficultly available forms of soil phosphorus. Phosphate-solubilizing microbes are also known to produce enzymes, siderophores, and growth hormones; embellish plant growth and biocontrol activity; and improve soil properties. Such microorganisms possessing attributes, beneficial for plants are termed as plant growth-promoting rhizobacteria (PGPR). There are plentiful reports on bacterialmediated plant growth promotion under nonstressed conditions although fewer reports are available on their effects under stressed condition. The bacterial ability to enhance tolerance of plants in stressed soils and the impact of PGPR consortium (mixture) on different crops are highlighted. The major idea here is to consolidate the fact that PGPR consortium can be used directly in stress-affected soil with an aim to refurbish soil conditions to foster crop productivity in stressed soils.

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“…EC10 on T. repens growth in the presence of different concentrations of Zn and Cd were conducted in pots (5 cm diameter and 6 cm high) containing non-spiked or metalspiked soil. The soil used in this study was an agricultural soil from northern Portugal, and the physicochemical properties have been described in detail by Marques et al (2013). The soil was milled (2 mm) and sterilized by steaming (120°C for 70 min on two consecutive days and dried in an oven at 40°C for 4 days).…”

Section: Pot Experiments: T Repens Growth Under Zn and CD Exposurementioning

confidence: 99%

Rhizobacteria isolated from a metal-polluted area enhance plant growth in zinc and cadmium-contaminated soil

Pereira

Barbosa

Castro

2014

Int. J. Environ. Sci. Technol.

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In this work, we evaluated the ability of rhizobacteria isolated from a metal-contaminated site to produce plant growth-promoting substances, such as indole-3-acetic acid (IAA), ammonia, hydrogen cyanide, siderophores and extracellular enzymes, to solubilize phosphate and for 1-aminocyclopropane-1-carboxylate (ACC)-deaminase activity, while assessing their capacity to enhance Trifolium repens growth. The rhizobacteria that better performed were used as bioinoculants for plants grown in zinc-and cadmium-spiked soils. Rhizobacteria were inoculated onto white clover seedlings growing in 250 and 500 mg kg -1 of zinc and in 10 and 30 mg kg -1 of cadmium-spiked soils and plant traits determined. The available and exchangeable rhizosphere metal concentrations were analyzed. Twenty rhizobacteria stimulated white clover growth under axenic conditions. Overall, strains Rhodococcus erythropolis EC 34, Achromobacter sp. 1AP2 and Microbacterium sp. 3ZP2 increased clover biomass in the absence and in presence of metals; however, in soils with 250 mg kg -1 of zinc, bacterial inoculation did not enhance plant biomass. Biomass enhancement may be related to the multiple bacterial promoting traits, especially the production of high levels of IAA and siderophores and the activity of ACC-deaminase. To the best of our knowledge, this is the first study reporting the potential of R. erythropolis to increase plant growth in metal-contaminated soils. In general, strains Microbacterium sp. 3ZP2 and Arthrobacter sp. EC 10 enhanced the available and exchangeable metal concentrations in rhizosphere showing their potential to improve phytoremediation efficiency. This work clearly indicates that rhizobacteria are promising for the development of bioinoculants useful for phytoremediation of polluted soils.

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Inoculating Helianthus annuus (sunflower) grown in zinc and cadmium contaminated soils with plant growth promoting bacteria – Effects on phytoremediation strategies

Cited by 161 publications

References 52 publications

The Nodule Microbiome: N₂-Fixing Rhizobia Do Not Live Alone

The Nodule Microbiome: N₂-Fixing Rhizobia Do Not Live Alone

Microbial Consortium of Plant Growth-Promoting Rhizobacteria Improves the Performance of Plants Growing in Stressed Soils: An Overview

Rhizobacteria isolated from a metal-polluted area enhance plant growth in zinc and cadmium-contaminated soil

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Inoculating Helianthus annuus (sunflower) grown in zinc and cadmium contaminated soils with plant growth promoting bacteria – Effects on phytoremediation strategies

Cited by 161 publications

References 52 publications

The Nodule Microbiome: N2-Fixing Rhizobia Do Not Live Alone

The Nodule Microbiome: N2-Fixing Rhizobia Do Not Live Alone

Microbial Consortium of Plant Growth-Promoting Rhizobacteria Improves the Performance of Plants Growing in Stressed Soils: An Overview

Rhizobacteria isolated from a metal-polluted area enhance plant growth in zinc and cadmium-contaminated soil

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The Nodule Microbiome: N₂-Fixing Rhizobia Do Not Live Alone

The Nodule Microbiome: N₂-Fixing Rhizobia Do Not Live Alone