Enhancement of rice growth and yield in actual acid sulfate soils by potent acid-resistant Rhodopseudomonas palustris strains for producing safe rice

Khương, Nguyễn Quốc; Kantachote, Duangporn; Onthong, Jumpen; Xuan, Ly Ngoc Thanh; Sukhoom, Ampaitip

doi:10.1007/s11104-018-3705-7

Cited by 40 publications

(47 citation statements)

References 44 publications

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“…The problem is more serious in paddy fields because the threat can spread in soil and water affecting soil fertility, water quality and human health in the wider environment (Neculita and Rosa 2019). In the pursuit of sustainable agricultural development, metal-resistant microorganisms have been studied for their ability to transform metals ions and heavy metals, and to reduce metal toxicity, cations and divalent cations (Nunkaew et al 2015;Nookongbut et al 2016Nookongbut et al , 2018Panhwar et al 2016;Sakpirom et al 2017Sakpirom et al , 2019Khuong et al 2018). To our knowledge, little study has taken place of Mn 2+ -resistant PNSB for this purpose in acid paddy fields.…”

Section: Discussionmentioning

confidence: 99%

“…This is due to the fact that they are plant growth promoting bacteria (PGPB) that release plant growth promoting substances (PGPS) such as ALA, IAA and siderophores, and the plant nutrients, NH 4 + by N 2 fixation and PO 4 3− by P-solubilization (Nunkaew et al 2014;Khuong et al 2018;Nookongbut et al 2019). With the evidences that PNSB have been successfully applied to paddy fields on normal soil and also to fields on soil in saline and acidic conditions for enhancement rice growth and grain yield (Kantachote et al 2016;Khuong et al 2018). This could be t h a t t h e y a c t n o t o n l y b i o r e m ed i a t o r s b u t a l s o PGPB/biofertilizers.…”

Section: Introductionmentioning

confidence: 99%

“…Additionally, PNSB can grow in different growth modes as photoautotrophs, photoheterotrophs, chemoheterotrophs, and chemoautotrophs (Panwichian et al 2010;Imhoff 2017). They can do so in extreme stress conditions (Imhoff 2017) of acidity or salinity (Nunkaew et al 2015;Khuong et al 2017Khuong et al , 2018. PNSB have been isolated from areas contaminated with heavy metals such as Cd, As, Hg, and Pb (Panwichian et al 2010;Mukkata et al 2015;Nookongbut et al 2016;Sakpirom et al 2017).…”

Section: Introductionmentioning

confidence: 99%

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Potential of Mn2+-Resistant Purple Nonsulfur Bacteria Isolated from Acid Sulfate Soils to Act as Bioremediators and Plant Growth Promoters via Mechanisms of Resistance

Khương

Kantachote

Thúc

et al. 2020

J Soil Sci Plant Nutr

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Resistance mechanisms of acid Mn 2+-resistant purple nonsulfur bacteria (PNSB) were investigated to determine their ability to alleviate adverse effects of excess manganese on plant growth and productivity in acid sulfate soils (ASS). PNSB were isolated and selected based on their resistance to acid and manganese. Their resistance mechanisms were assessed on the basis of biosorption, bioaccumulation, and plant growth promoting properties. Six PNSB were selected for their resistance to Mn 2+ in acidic conditions (pH 3.5-5.5). They were identified as Rhodopseudomonas palustris strains TLS12, VNS19, VNS32, VNS62, and VNW95, and Rhodopseudomonas harwoodiae strain TLW42. Under aerobic dark and microaerobic light incubating conditions in aqueous solution at pH 4.25 for 30 min, these strains adsorbed Mn 2+ (1500 mg L −1) more effectively with released exopolymeric substances (EPS) than with their biomass. Under both incubating conditions, bioaccumulation of Mn 2+ diminished in the following order: cell wall, cytoplasm, plasma membrane. Scanning electron microscope-energy dispersive X-ray spectrometry (SEM-EDS) found accumulated manganese (0.30-0.67% of total elements) in bacterial cells caused morphological change in the form of wrinkles and bleb-like features on exterior surfaces. All selected strains under both incubating conditions released NH 4 + by N 2 fixing and PO 4 3− by solubilizing phosphate from various P-sources. Siderophores, 5-aminolevulinic acid (ALA), and indole-3-acetic acid (IAA) were also released and pH increased. The studied strains showed potential as bioremediators that could reduce Mn 2+ toxicity using EPS and effectively release nutrients and plant growth promoting substances to improve cultivation and fertility in acidic conditions.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Potential of Mn2+-Resistant Purple Nonsulfur Bacteria Isolated from Acid Sulfate Soils to Act as Bioremediators and Plant Growth Promoters via Mechanisms of Resistance

Khương

Kantachote

Thúc

et al. 2020

J Soil Sci Plant Nutr

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“…The acidic condition of soil is one of the most serious environmental stresses to affect the growth of crops and agricultural productivity. The treatment of seeds and seedlings with PGPB such as phototrophic bacteria has been proved to alleviate the effects of acidic soils (Khuong et al, 2018;Nookongbut et al, 2019). In anoxic acidic soils such as flooded paddy field, the problem of iron toxicity is caused by excessive Fe uptake due to Fe 2+ from ferric (Fe 3+ ) reduction.…”

Section: Discussionmentioning

confidence: 99%

“…Recently, plant growth promoting bacteria (PGPB) have gained a lot of attention worldwide for their ability to enhance agricultural production. To cope with stress caused by low pH, purple nonsulfur bacteria (PNSB), especially Rhodopseudomonas palustris, release several plant growth promoting substances (PGPS) using a variety of mechanisms (Sakpirom et al, 2017;Khuong et al, 2018). This behavior of PNSB encouraged us to visit peatlands in Thailand to isolate and obtain several strains of R. palustris that exhibited the plant growth promoting characters of iron sequestration (siderophores), metal entrapment (exopolymeric substances), nitrogen fixation, phosphate solubilization, 5-aminolevulinic acid (ALA) synthesis, and indole-3acetic acid (IAA) formation (Nookongbut et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Selection of Acid Tolerant Purple Nonsulfur Bacteria for Application in Agriculture

Nookongbut¹,

Jingjit²,

Kantachote³

et al. 2020

CMUJNS

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To screen acid tolerant purple nonsulfur bacteria (PNSB) isolated from peat swamp forests for their abilities to produce plant growth promoting substances (aminolevulinic acid: ALA, siderophores, indole-3-acetic acid: IAA) and also release ammonium from N2 fixation. Among 10 PNSB isolates grown in basic isolation medium (BIM), pH 4.5 found that strain KKSSR91 was the most effective to release ALA and siderophores under microaerobic light conditions; while strain KTPWG11 exhibited highest production of siderophores under aerobic dark conditions. Based on ALA production in medium containing 60 mM glycine, 4 PNSB isolates were selected for further studies and found that strain KTSSR92 produced highest IAA at 36.9 mg/L. All of them were able to release NH4 + , but no activity to solubilize phosphate. In addition, maximal ALA production in the medium supplemented with glycine by strain KKSSR91 was 2.89 mg/L at 4000 lux light intensity. Seed germination index (GI) of kidney bean (Phasecolus vulgaris L.) test using strain KKSSR91 at 1 g fresh biomass/L, pH 4.5 was 68.81% compared with a control in distilled water as only 58.68%. Strain KKSSR91 was identified using 16S rRNA sequencing and found that it showed 99% similarity with Rhodopseudomonas palustris.

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Encapsulation of Rhodopseudomonas palustrisKTSSR54 using beads from alginate/starch blends

Rohman

Kaewtatip

Kantachote

et al. 2020

J of Applied Polymer Sci

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Alginate beads are a promising carrier for biofertilizer delivery, but still possess drawbacks of low mechanical strength and bead shrinkage that result in poor appearance and inadequate cell protection. Blending alginate with starch was proposed as a solution to these problems, and here alginate hydrogels were prepared using a 2% (w/v) alginate dispersion blended with varying contents of gelatinized starch (0–5% w/v). The interaction produced a viscosity synergism that increased the complexity of the matrix network in the alginate/starch blends, producing a more suitable matrix for cell entrapment. Hydrogen bonding between alginate and starch influenced the viscosity of the various solutions in a way that was consistent with the FTIR spectra. The starch content also helped beads retain their spherical shape after drying. The starch supported the entrapment of bacterial cells (plant growth‐promoting bacterium Rhodopseudomonas palustris KTSSR54 as biofertilizer) in the matrix, which reduced cell loss. The highest entrapment efficiency of 70.83% was obtained at 4% (w/v) starch, while the entrapment efficiency of control beads was 50.56%. Overall, the appropriate content of starch mixed with alginate is conducive to changes in the morphology of microcapsules and increases in the amount of biological encapsulation.

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Enhancement of rice growth and yield in actual acid sulfate soils by potent acid-resistant Rhodopseudomonas palustris strains for producing safe rice

Cited by 40 publications

References 44 publications

Potential of Mn2+-Resistant Purple Nonsulfur Bacteria Isolated from Acid Sulfate Soils to Act as Bioremediators and Plant Growth Promoters via Mechanisms of Resistance

Potential of Mn2+-Resistant Purple Nonsulfur Bacteria Isolated from Acid Sulfate Soils to Act as Bioremediators and Plant Growth Promoters via Mechanisms of Resistance

Selection of Acid Tolerant Purple Nonsulfur Bacteria for Application in Agriculture

Encapsulation of Rhodopseudomonas palustrisKTSSR54 using beads from alginate/starch blends

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