scholarly journals Mitigation of Nickel Toxicity and Growth Promotion in Sesame through the Application of a Bacterial Endophyte and Zeolite in Nickel Contaminated Soil

2020 ◽  
Vol 17 (23) ◽  
pp. 8859 ◽  
Author(s):  
Muhammad Naveed ◽  
Syeda Sosan Bukhari ◽  
Adnan Mustafa ◽  
Allah Ditta ◽  
Saud Alamri ◽  
...  
Keyword(s):  
Plant Growth ◽  
Contaminated Soil ◽  
Root Zone ◽  
Plant Biomass ◽  
Growth Promotion ◽  
Research Work ◽  
Control Treatment ◽  
Soil Conditions ◽  
Combined Application ◽  
Bioavailable Fraction

Nickel (Ni) bioavailable fraction in the soil is of utmost importance because of its involvement in plant growth and environmental feedbacks. High concentrations of Ni in the soil environment, especially in the root zone, may retard plant growth that ultimately results in reduced plant biomass and yield. However, endophytic microorganisms have great potential to reduce the toxicity of Ni, especially when applied together with zeolite. The present research work was conducted to evaluate the potential effects of an endophytic bacterium Caulobacter sp. MN13 in combination with zeolite on the physiology, growth, quality, and yield of sesame plant under normal and Ni stressed soil conditions through possible reduction of Ni uptake. Surface sterilized sesame seeds were sown in pots filled with artificially Ni contaminated soil amended with zeolite. Results revealed that plant agronomic attributes such as shoot root dry weight, total number of pods, and 1000-grains weight were increased by 41, 45, 54, and 65%, respectively, over control treatment, with combined application of bacteria and zeolite in Ni contaminated soil. In comparison to control, the gaseous exchange parameters (CO2 assimilation rate, transpiration rate, stomatal- sub-stomatal conductance, chlorophyll content, and vapor pressure) were significantly enhanced by co-application of bacteria and zeolite ranging from 20 to 49% under Ni stress. Moreover, the combined utilization of bacteria and zeolite considerably improved water relations of sesame plant, in terms of relative water content (RWC) and relative membrane permeability (RMP) along with improvement in biochemical components (protein, ash, crude fiber, fat), and micronutrients in normal as well as in Ni contaminated soil. Moreover, the same treatment modulated the Ni-stress in plants through improvement in antioxidant enzymes (AEs) activities along with improved Ni concentration in the soil and different plant tissues. Correlation and principal component analysis (PCA) further revealed that combined application of metal-tolerant bacterium Caulobacter sp. MN13 and zeolite is the most influential strategy in alleviating Ni-induced stress and subsequent improvement in growth, yield, and physio-biochemical attributes of sesame plant.

scholarly journals SCREENING OF SALT TOLERANT BACTERIA FOR PLANT GROWTH PROMOTION ACTIVITIES AND BIOLOGICAL CONTROL OF RICE BLAST AND SHEATH BLIGHT DISEASE ON MANGROVE RICE

2018 ◽  
Vol 55 (1A) ◽  
pp. 54
Author(s):  
Nguyen Van Minh
Keyword(s):  
Antifungal Activity ◽  
Plant Growth ◽  
Fungal Pathogen ◽  
Rice Blast ◽  
Root Zone ◽  
Growth Promotion ◽  
Sheath Blight ◽  
Control Treatment ◽  
Rice Soil ◽  
Model Combination

From 22 rice, soil and water samples collected in the field of Long An and Tien Giang provinces, we isolated and screened 87 strains of bacteria around the root zone and endophytic bacteria. Through testing the ability of plant growth stimulation, the result showed 16 strains were capable of nitrogen fixation, 13 strains were capable of phosphate solubilization, 27 strains were capable of IAA production and 2 strains had all 3 activities. By the dual testing method and the percentage of inhibition method between bacterial and fungal pathogen, LD5 and LS6 strains had the highest antifungal activity against Rhizotocnia sp. CR1 at 94.02 %. TS3 and TĐ13 strains had the highest antifungal activity against Magnaporthe sp. BP3 at 81.74 ± 0.88 % and 80 ± 0.60 %, respectively. Furthermore, there were 6 strains inhibiting both Rhizotocnia sp. CR1 and Magnaporthe sp. BP3 (LĐ5, LS4, LS6, LN1, LN6, TS3). The strains were identified by biochemical methods. The results showed that LD5, LS6 and TS3 were 70.37 % similar to Bacillus thurigiensis, TD13 strain was 70.37 % similar to Bacillus pantothenticus, TD9 strain was 72.72 % similar to Azotobacter vinelandii and TD6 strain was 70.37 % similar to Bacillus subtilis. Regarding the test of activity to stimulate growth in net house model, combination of 4-strain (TD6, TD9, TD13, TS3) had the effect of increasing the length of roots, trunk and weight of rice compared with control treatment. For evaluation of biocontrol of fungal pathogen in net house model, the abilities to control sheath blight in N-2C1 and N-LĐ5 treatment were the highest (40.59 % and 39.06 %, respectively). The ability to control rice blast in N-2C2 treatment was the highest (41.26 %). The ability to biocontrol both sheath blight and rice blast in N-4C treatment was 37.89 %.

scholarly journals Foliar-Applied Potassium Silicate Coupled with Plant Growth-Promoting Rhizobacteria Improves Growth, Physiology, Nutrient Uptake and Productivity of Faba Bean (Vicia faba L.) Irrigated with Saline Water in Salt-Affected Soil

Plants ◽  
2021 ◽  
Vol 10 (5) ◽  
pp. 894
Author(s):  
Emad M. Hafez ◽  
Hany S. Osman ◽  
Usama A. Abd El-Razek ◽  
Mohssen Elbagory ◽  
Alaa El-Dein Omara ◽  
...  
Keyword(s):  
Plant Growth ◽  
Fresh Water ◽  
Faba Bean ◽  
Saline Water ◽  
Plant Growth Promoting Rhizobacteria ◽  
Control Treatment ◽  
Combined Application ◽  
Bean Plants ◽  
Plant Growth Promoting ◽  
Growth Promoting

The continuity of traditional planting systems in the last few decades has encountered its most significant challenge in the harsh changes in the global climate, leading to frustration in the plant growth and productivity, especially in the arid and semi-arid regions cultivated with moderate or sensitive crops to abiotic stresses. Faba bean, like most legume crops, is considered a moderately sensitive crop to saline soil and/or saline water. In this connection, a field experiment was conducted during the successive winter seasons 2018/2019 and 2019/2020 in a salt-affected soil to explore the combined effects of plant growth-promoting rhizobacteria (PGPR) and potassium (K) silicate on maintaining the soil quality, performance, and productivity of faba bean plants irrigated with either fresh water or saline water. Our findings indicated that the coupled use of PGPR and K silicate under the saline water irrigation treatment had the capability to reduce the levels of exchangeable sodium percentage (ESP) in the soil and to promote the activity of some soil enzymes (urease and dehydrogenase), which recorded nearly non-significant differences compared with fresh water (control) treatment, leading to reinstating the soil quality. Consequently, under salinity stress, the combined application motivated the faba bean vegetative growth, e.g., root length and nodulation, which reinstated the K+/Na+ ions homeostasis, leading to the lessening or equalizing of the activity level of enzymatic antioxidants (CAT, POD, and SOD) compared with the controls of both saline water and fresh water treatments, respectively. Although the irrigation with saline water significantly increased the osmolytes concentration (free amino acids and proline) in faba bean plants compared with fresh water treatment, application of PGPR or K-silicate notably reduced the osmolyte levels below the control treatment, either under stress or non-stress conditions. On the contrary, the concentrations of soluble assimilates (total soluble proteins and total soluble sugars) recorded pronounced increases under tested treatments, which enriched the plant growth, the nutrients (N, P, and K) uptake and translocation to the sink organs, which lastly improved the yield attributes (number of pods plant−1, number of seeds pod−1, 100-seed weight). It was concluded that the combined application of PGPR and K-silicate is considered a profitable strategy that is able to alleviate the harmful impact of salt stress alongside increasing plant growth and productivity.

scholarly journals Penicillium simplicissimum NL-Z1 Induced an Imposed Effect to Promote the Leguminous Plant Growth

2021 ◽  
Vol 12 ◽  
Author(s):  
Jiayao Zhuang ◽  
Chao Liu ◽  
Xiaoxue Wang ◽  
Tongxin Xu ◽  
Hao Yang
Keyword(s):  
Plant Growth ◽  
Rock Slope ◽  
Plant Biomass ◽  
Control Treatment ◽  
Leguminous Plant ◽  
Penicillium Simplicissimum ◽  
Nodule Biomass ◽  
Underlying Mechanisms ◽  
Phosphate Solubilizing ◽  
A Minor

It is found effective for phytoremediation of the guest soil spraying method by adding microbes to promote the growth of arbor leguminous plant on a high and steep rock slope. However, its underlying mechanisms remain elusive. Here, some experiments were conducted to explore the multifunctions of Penicillium simplicissimum NL-Z1 on rock weathering, nodule growth, and beneficial microbial regulation. The results show that P. simplicissimum NL-Z1 significantly increased the release of phosphorus, potassium, calcium, and magnesium from the rock by 226, 29, 24, and 95%, respectively, compared with that of the control. A significant increase of 153% in Indigofera pseudotinctoria Matsum nodule biomass, accompanied by an increase of 37% in the leguminous plant biomass was observed in the P. simplicissimum NL-Z1 treatment than in the control treatment. Interestingly, even though P. simplicissimum NL-Z1 itself became a minor microbial community in the soil, it induced a significant increase in Mortierella, which, as a beneficial microbe, can promote phosphate-solubilizing and plant growth. The results suggest that P. simplicissimum NL-Z1 could induce an imposed effect to promote leguminous plant growth, which may be conducive to the development of the phytoremediation technique for high and steep rock slope. The study provides a novel thought of using the indirect effect of microbes, i.e., promoting other beneficial microbes, to improve soil environment.

Phytoremediation of contaminated soil Lead and Cadmium by Brassica júncea (L.) Czern plant

2020 ◽  
Vol 5 (4) ◽  
pp. 110-120
Author(s):  
Qunshan Wei ◽  
◽  
Bilal . ◽  
Muhammad Noman ◽  
Zhemin Shen ◽  
...  
Keyword(s):  
Brassica Juncea ◽  
Contaminated Soil ◽  
Contaminated Soils ◽  
Plant Biomass ◽  
Research Work ◽  
Alluvial Soil ◽  
Body Parts ◽  
Polluted Soils ◽  
Lead And Cadmium ◽  
Allowable Range

Many remediating strategies are used for polluted soils, however, but mostly the essential phytoremediation is a less expensive, organically satisfying technique that is generally reasonable for various countries. Pot tests were managed to dissect the Brassica júncea plant biomass cultivated on Pb as well as Cd polluted soils as well to survey its ampleness for the evacuation of Pb and Cd. Samples of picked plants developed at a blend of alluvial soil and sand were moved with vessel of pots the earth finishing extents as well allowed make with time regenerative development. Through acid digestion, Pb and Cd extraction was settled from the plant. Consequently, they were collected and afterwards examined for chosen metals through utilizing Atomic Absorption Spectrometry (AAS). Generally, the current examination results demonstrated that no hyperaccumulators of Pb as well Cd were recognized in the region. Body parts of the plant were categorized as Pb low accumulators, moderate accumulators and excluder, as well as Cd low accumulator, excluder. Additionally, Cd concentration was high up than the allowable range in species of plant. In plants, allowable range of Pb and Cd is 0.2 - 20 and 0.1 -2.4 mg kg – 1. In Brassica júncea plant the Pb as well Cd both were no hyperaccumulators. Hence, this local plant had the suitable ability to use for phytoremediation of contaminated soils around the Hayatabad Industrial area, Peshawar. All experimental Results demonstrated that from the medium of soil by Brassica júncea (L.) Czern plant the maximum lead and cadmium removals were 94 % and 94.26 %, respectively in the open environment, while in the control environment this removal was 82 % for Pb and 93.16 % for Cd .The present research work observes that brassica júncea (L.) Czern plant was more helpful for Cd take-up contrasted with Pb, and thus it is capacity we suggest Pb as well Cd for remediation from polluted soils. Keywords: Lead, Cadmium, Contaminated soil, Removal

Arbuscular mycorrhizal fungi alleviate abiotic stresses in potato plants caused by low phosphorus and deficit irrigation/partial root-zone drying

2018 ◽  
Vol 156 (1) ◽  
pp. 46-58 ◽  
Author(s):  
Caixia Liu ◽  
Sabine Ravnskov ◽  
Fulai Liu ◽  
Gitte H. Rubæk ◽  
Mathias N. Andersen
Keyword(s):  
Plant Growth ◽  
Arbuscular Mycorrhizal Fungi ◽  
Mycorrhizal Fungi ◽  
Growth Response ◽  
Root Zone ◽  
Plant Biomass ◽  
N Uptake ◽  
Arbuscular Mycorrhizal ◽  
P Fertilization ◽  
Low Phosphorus

AbstractDeficit irrigation (DI) improves water use efficiency (WUE), but the reduced water input often limits plant growth and nutrient uptake. The current study examined whether arbuscular mycorrhizal fungi (AMF) could alleviate abiotic stress caused by low phosphorus (P) fertilization and DI.A greenhouse experiment was conducted with potato grown with (P1) or without (P0) P fertilization, with AMF (M1+:Rhizophagus irregularisor M2+:Glomus proliferum) or AMF-free control (M−) and subjected to full irrigation (FI), DI or partial root-zone drying (PRD).Inoculation of M1+ and M2+ maintained or improved plant growth and P/nitrogen (N) uptake when subjected to DI/PRD and P0. However, the positive responses to AMF varied with P level and irrigation regime. Functional differences were found in ability of AMF species alleviating plant stress. The largest positive plant biomass response to M1+ and M2+ was found under FI, both at P1 and P0 (25% increase), while plant biomass response to M1+ and M2+ under DI/PRD (14% increase) was significantly smaller. The large growth response to AMF inoculation, particularly under FI, may relate to greater photosynthetic capacity and leaf area, probably caused by stimulation of plant P/N uptake and carbon partitioning toward roots and tubers. However, plant growth response to AMF was not related to the percentage of AMF root colonization. Arbuscular mycorrhizal fungi can maintain and improve P/N uptake, WUE and growth of plants both at high/low P levels and under FI/DI. If this is also the case under field conditions, it should be implemented for sustainable potato production.

Stimulation of the ionic transport system in Brassica napus by a plant growth-promoting rhizobacterium (Achromobacter sp.)

2000 ◽  
Vol 46 (3) ◽  
pp. 229-236 ◽  
Author(s):  
H Bertrand ◽  
C Plassard ◽  
X Pinochet ◽  
B Touraine ◽  
P Normand ◽  
...  
Keyword(s):  
Brassica Napus ◽  
Plant Growth ◽  
Root System ◽  
Oilseed Rape ◽  
Root Zone ◽  
Growth Promotion ◽  
Mineral Nutrient ◽  
Plant Growth Promoting ◽  
Growth Promoting ◽  
Achromobacter Sp

A plant growth-promoting rhizobacterium belonging to the genus Achromobacter was isolated from the oilseed-rape (Brassica napus) root. Growth promotion bioassays were performed with oilseed rape seedlings in a growth chamber in test tubes containing attapulgite and mineral nutrient solution, containing NO3- as N source. The presence of this Achromobacter strain increased shoot and root dry weight by 22-33% and 6-21%, respectively. Inoculation of young seedlings with the Achromobacter bacteria induced a 100% improvement in NO3- uptake by the whole root system. Observations on the seminal root of seedlings 20 h after inoculation showed that there was an enhancement of both the number and the length of root hairs, compared to non-inoculated seedlings. Electrophysiological measurements of NO3- net flux with ion-selective microelectrodes showed that inoculation resulted in a specific increase of net nitrate flux in a root zone morphologically similar in inoculated and non-inoculated plants. The root area increased due to root hair stimulation by the Achromobacter bacteria, which might have contributed to the improvement of NO3- uptake by the whole root system, together with the enhancement of specific NO3- uptake rate. Moreover, inoculated plants showed increased potassium net influx and proton net efflux. Overall, the data presented suggest that the inoculation of oilseed-rape with the bacteria Achromobacter affects the mineral uptake.Key words: Brassica napus, plant growth-promoting rhizobacteria, Achromobacter sp., mineral uptake, root morphology.

Optimizing the combined application of amendments to allow plant growth in a multielement-contaminated soil

Chemosphere ◽  
2016 ◽  
Vol 148 ◽  
pp. 220-226 ◽  
Author(s):  
A. Sevilla-Perea ◽  
M.C. Romero-Puertas ◽  
M.D. Mingorance
Keyword(s):  
Plant Growth ◽  
Contaminated Soil ◽  
Combined Application

scholarly journals Burkholderia sp. from rhizosphere of Rhododendron arboretum: Isolation, identification and plant growth promotory (PGP) activities

2014 ◽  
Vol 6 (2) ◽  
pp. 473-479 ◽  
Author(s):  
Shweta Nailwal ◽  
Md. Shahbaz Anwar ◽  
Kamal Kant Budhani ◽  
Amit Verma ◽  
Tapan Kumar Nailwal
Keyword(s):  
Plant Growth ◽  
Plant Growth Promotion ◽  
Growth Promotion ◽  
Research Work ◽  
Growth Index ◽  
Wheat Plant ◽  
Plant Growth Promoting Rhizobacteria ◽  
Remarkable Change ◽  
Enhanced Production ◽  
Plant Growth Promoting

Plant growth promoting rhizobacteria (PGPR) is beneficial bacteria that colonize plant roots and enhance plant growth by wide variety of mechanism like phosphate solubilisation, etc. Use of PGPR has steadily increased in agriculture and offers an attractive way to replace chemical fertilizers, pesticides and supplements. The present research work was designed to isolate and characterize the PGP activity of Burkholderia sp. For this purpose rhizospheric soil from Rhododendron arboreum of Kumaun Himalaya was collected and efficient bacterial strain was screened on the basis of phosphate solubilization. Further, assessment of various parameters of plant growth promotion activity was done and enhanced production of IAA (16.4 μgml-1) and (20.8 μgml-1) was observed in the presence of 250μgml-1 and 500 μg ml-1 of tryptophan, respectively. Correspondingly, in respect of 7.8 μg ml-1 IAA without tryptophan, and their confirmation was executed by TLC. A remarkable change in color from green to reddish-brown zone on CAS plates, suggests the positive result for siderophore production, and finally the seed germination and pot trial experiment depicted the growth index of wheat plant. Therefore, the present study suggests that Burkholderia sp. is beneficial for plant growth promotion.

scholarly journals Salt Tolerant Rhizobacteria from Coastal Region of Bangladesh Portrayed the Potential for Plant Growth Promotion

2021 ◽  
pp. 58-70
Author(s):  
Md. Shoaib Arifin ◽  
Md. Shafiul Islam Rion ◽  
Atiqur Rahman ◽  
H. M. Zakir ◽  
Quazi Forhad Quadir
Keyword(s):  
Salt Stress ◽  
Plant Growth ◽  
Plant Growth Promotion ◽  
Growth Promotion ◽  
Research Work ◽  
Salt Tolerant ◽  
Salt Stress Condition ◽  
Plant Growth Promoting ◽  
Growth Promoting ◽  
Phosphate Solubilizing

Plant growth-promoting rhizobacteria can effectively reduce the severity of different abiotic stresses like water stress, temperature stress, salt stress, etc. on plant growth and development. The study aimed at isolating salt-tolerant rhizobacteria followed by their morphological, biochemical and plant growth promotion traits evaluation. Sixteen root samples of nine different plant species were collected from two locations of Patuakhali, a coastal southern district of Bangladesh. Thirty rhizobacteria were isolated, fifteen from each location, to assess their halotolerance and plant growth promoting potential. The isolated rhizobacteria were subjected to morphological (viz. shape, colour and elevation), biochemical (viz. Gram reaction, catalase test and HCN production) and growth-promoting traits [viz. phosphate solubilizing ability, salt tolerance, indole-3-acetic acid (IAA) production, and N2-fixation] characterization. Twenty-eight isolates were Gram positive, 27 were catalase positive, and nine showed varying degrees of phosphate solubilization on National Botanical Research Institute of Phosphate (NBRIP) medium. Isolate PWB5 showed the highest phosphate solubilizing index (PSI = 3.83±0.098) on the 6th day. To screen salt-tolerant rhizobacteria, the isolates were cultured in NBA media containing different (0%, 2.5%, 5%, 7.5%, 10%, 12%, 15%) NaCl concentrations. Isolate PWB12 and PWB13 grew at 15% NaCl concentration. Eleven isolates exhibited IAA producing ability on Winogradsky medium amended with L-tryptophan among which four (PMB13, PMB14, PMB15 and PWB6) were strong IAA producers. Twenty-seven isolates were potential N2-fixer and among them, 20 were highly efficient, but none of the isolates was HCN producer. The rhizobacteria isolated in the current research work showed some potential plant growth-promoting traits which seem applicable for crop production, especially, under salt stress condition.

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