Improvement of cadmium uptake and accumulation in Sedum alfredii by endophytic bacteria Sphingomonas SaMR12: Effects on plant growth and root exudates

Feng, Ying; Zhang, Yibin; Rafiq, Muhammad Tariq; Khan, Kiran Yasmin; Pan, Fengshan; Yang, Xiaoe

doi:10.1016/j.chemosphere.2014.07.078

Cited by 121 publications

(42 citation statements)

References 25 publications

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“…Several reports have been published on the positive contribution of organic acid-producing microorganisms in increasing the availability of nutrients (P, K, Zn) in the rhizosphere (Goswami et al 2014;Meena et al 2015;Sirohi et al 2015). Chen et al (2014aChen et al ( , 2014b and Raja et al (2006) observed significant changes in the root exudate pattern and solubilization of precipitated metals due to inoculation of plant growth-promoting rhizobacteria. Singh et al (2018) also reported that the Zn solubilization activity of endophytic bacteria positively correlates with the accumulation of Zn in wheat grains (Fig.…”

Section: Organic Acid Secretion and Proton Extrusionmentioning

confidence: 99%

“…These increased root parameters directly facilitated Fe fortification in wheat grains (Singh 2016). Chen et al (2014aChen et al ( , 2014b reported that inoculation with endophytic bacterium Sphingomonas SaMR12 significantly improved the root length, root surface area, and average number of root tips in Sedum alfredii plant, as compared to uninoculated treatment. Batista et al (2016) suggested that root morphological parameters, such as total root length and root surface area, play an important role in nutrient uptake, particularly under micronutrient-limiting conditions.…”

Section: Modification In Root Morphology and Anatomymentioning

confidence: 99%

“…A less investigated approach, which is promising, involves exploring plant-microbe interactions, which are known to have a crucial role in improving the nutritional status of soil and enriching micronutrients through metal solubilization, mobilization, and translocation to different parts of the plant (Chen et al 2014a(Chen et al , 2014bKothari et al 1990;Rana et al 2012) (Fig. 1).…”

Section: Introductionmentioning

confidence: 99%

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Potential of microbes in the biofortification of Zn and Fe in dietary food grains. A review

Singh

Prasanna

2020

Agron. Sustain. Dev.

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Micronutrients are essential factors for human health and integral for plant growth and development. Among the micronutrients, zinc (Zn) and iron (Fe) deficiency in dietary food are associated with malnutrition symptoms (hidden hunger), which can be overcome through biofortification. Different strategies, such as traditional and molecular plant breeding or application of chemical supplements along with fertilizers, have been employed to develop biofortified crop varieties with enhanced bioavailability of micronutrients. The use of microorganisms to help the crop plant in more efficient and effective uptake and translocation of Zn and Fe is a promising option that needs to be effectively integrated into agronomic or breeding approaches. However, this is less documented and forms the subject of our review. The major findings related to the mobilization of micronutrients by microorganisms highlighted the significance of (1) acidification of rhizospheric soil and (2) stimulation of secretion of phenolics. Plantmicrobe interaction studies illustrated novel inferences related to the (3) modifications in the root morphology and architecture, (4) reduction of phytic acid in food grains, and (5) upregulation of Zn/Fe transporters. For the biofortification of Zn and Fe, formulation(s) of such microbes (bacteria or fungi) can be explored as seed priming or soil dressing options. Using the modern tools of transcriptomics, metaproteomics, and genomics, the genes/proteins involved in their translocation within the plants of major crops can be identified and engineered for improving the efficacy of plant-microbe interactions. With micronutrient nutrition being of global concern, it is imperative that the synergies of scientists, policy makers, and educationists focus toward developing multipronged approaches that are environmentally sustainable, and integrating such microbial options into the mainframe of integrated farming practices in agriculture. This can lead to better quality and yields of produce, and innovative approaches in food processing can deliver cost-effective nutritious food for the undernourished populations.

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Section: Organic Acid Secretion and Proton Extrusionmentioning

confidence: 99%

Section: Modification In Root Morphology and Anatomymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Potential of microbes in the biofortification of Zn and Fe in dietary food grains. A review

Singh

Prasanna

2020

Agron. Sustain. Dev.

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“…The PGPB Sphingomonas SaMR12, first isolated from the surface-sterilized root of a Chinese native Cd/Zn hyperaccumulator S. alfredii [60,61], was shown to promote plant growth, protect S. alfredii roots from Cd damage and alleviate ROS damage by decreasing H 2 O 2 and O 2 • − [11,12,63]. In a pot experiment, SaMR12 showed a positive effect on Brassica napus growth, plant Cd uptake and Cd translocation to the leaves [42].…”

Section: Introductionmentioning

confidence: 99%

The endophytic bacterium Sphingomonas SaMR12 alleviates Cd stress in oilseed rape through regulation of the GSH-AsA cycle and antioxidative enzymes

Wang

et al. 2020

BMC Plant Biol

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Background: Microbes isolated from hyperaccumulating plants have been reported to be effective in achieving higher phytoextraction efficiency. The plant growth-promoting bacteria (PGPB) SaMR12 from the cadmium (Cd)/ zinc hyperaccumulator Sedum alfredii Hance could promote the growth of a non-host plant, oilseed rape, under Cd stress. However, the effect of SaMR12 on Brasscia juncea antioxidative response under Cd exposure was still unclear. Results: A hydroponic experiment was conducted to study the effects of Sphingomonas SaMR12 on its non-host plant Brassica juncea (L.) Czern. under four different Cd treatments. The results showed that SaMR12 could colonize and aggregate in the roots and then move to the shoots. SaMR12 inoculation promoted plant growth by up to 71% in aboveground biomass and 81% in root biomass over that of the non-inoculated plants. SaMR12-inoculated plants significantly enhanced root Cd accumulation in the 10 and 20 μM Cd treatments, with 1.72-and 0.86-fold increases, respectively, over that of the non-inoculated plants. SaMR12 inoculation not only decreased shoot hydrogen peroxide (H 2 O 2) content by up to 38% and malondialdehyde (MDA) content by up to 60% but also reduced proline content by 7-30% in shoots and 17-32% in roots compared to the levels in non-inoculated plants. Additionally, SaMR12 inoculation promoted the activities of superoxide dismutase (SOD), peroxidase (POD), catalase (CAT), and ascorbate peroxidase (APX) and facilitated the relative gene expression levels of dehydroascorbate reductase (DHAR) and glutathione reductase (GR) involved in the glutathione (GSH)-ascorbic acid (AsA) cycle. Conclusions: The results demonstrated that, under Cd stress, SaMR12 inoculation could activate the antioxidative response of B. juncea by decreasing the concentrations of H 2 O 2 , MDA and proline, increasing the activities of antioxidative enzymes, and regulating the GSH-AsA cycle. These results provide a theoretical foundation for the potential application of hyperaccumulator endophytic bacteria as remediating agents to improve heavy metal tolerance within non-host plant species, which could further improve phytoextraction efficiency.

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“…Endophyte Sphingomonas is widely distributed in various plants including tomato, Sedum alfredii, Dendrobium officinale Khan et al, 2014;Chen et al, 2014b;Yang et al, 2014). Several reports have proved significant role of Sphingomonas and Pseudomonas for plant hosts by increasing plant biomass, improving cadmium uptake, fixing nitrogen and producing phytohormone including gibberellins and indole-3-acetic acid (IAA) Khan et al, 2014;Chen et al, 2014b;Yang et al, 2014). Genomic analysis of some Pseudomonas strains isolated from plants indicated that they uphold the potential to be involved in plant growth promotion, environmental adaptation and antagonism to fungal pathogens (Duan et al, 2013;Illakkiam et al, 2014).…”

Section: Discussionmentioning

confidence: 99%

Diversity and distribution of endophytic bacterial community in the Noni (Morinda citrifolia L.) plant

Liu¹,

Li²,

Yao³

et al. 2015

Afr. J. Microbiol. Res.

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Noni (Morinda citrifolia L.) is a plant used by traditional cultures and also in modern health care products. Various chemical substances are derived from the plant and include, but are not limited to anthraquinone flavonol glycosides, iridoid glycosides, lipids glycosides and triterpenoids. Also commonly found on the plant are endophytic bacteria however, there are no reports on endophytic bacterial community of Noni. We collected samples from five sites of Noni plant (roots, branches, leaves, fruits and seeds) and performed 16S rDNA analysis. Results show that these five parts harbor a highly similar bacterial composition with the top four being Sphingomonas, Pseudomonas, Halomonas and Geobacillus. Sphingomonas and Pseudomonas were found to be widely distributed in plant endophytic biotope; while there are little reports on plant-associated Halomonas and Geobacillus, indicating distribution in the plant hosts. Unknown genus also is abundant in five sites of Noni, ranging from 26.70 to 33.66%, implicating necessity to reveal them. This study provides information on endophytic bacteria in the Noni for future analysis based on a metagenome strategy.

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Improvement of cadmium uptake and accumulation in Sedum alfredii by endophytic bacteria Sphingomonas SaMR12: Effects on plant growth and root exudates

Cited by 121 publications

References 25 publications

Potential of microbes in the biofortification of Zn and Fe in dietary food grains. A review

Potential of microbes in the biofortification of Zn and Fe in dietary food grains. A review

The endophytic bacterium Sphingomonas SaMR12 alleviates Cd stress in oilseed rape through regulation of the GSH-AsA cycle and antioxidative enzymes

Diversity and distribution of endophytic bacterial community in the Noni (Morinda citrifolia L.) plant

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