Seaweed extracts as prospective plant growth bio-stimulant and salinity stress alleviator for Vigna sinensis and Zea mays

Plant growth promoting endophytic bacteria, which can fix nitrogen, plays a vital role in plant growth promotion. Previous authors have evaluated the effect of Gluconacetobacter diazotrophicus Pal5 inoculation on plants subjected to different sources of abiotic stress on an individual basis. The present study aimed to appraise the effect of G. diazotrophicus inoculation on the amelioration of the individual and combined effects of drought and nitrogen stress in maize plants (Zea mays L.). A pot experiment was conducted whereby treatments consisted of maize plants cultivated under drought stress, in soil with a low nitrogen concentration and these two stress sources combined, with and without G. diazotrophicus seed inoculation. The inoculated plants showed increased plant biomass, chlorophyll content, plant nitrogen uptake, and water use efficiency. A general increase in copy numbers of G. diazotrophicus, based on 16S rRNA gene quantification, was detected under combined moderate stress, in addition to an increase in the abundance of genes involved in N fixation (nifH). Endophytic colonization of bacteria was negatively affected by severe stress treatments. Overall, G. diazotrophicus Pal5 can be considered as an effective tool to increase maize crop production under drought conditions with low application of nitrogen fertilizer.

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Multi-Trait Wheat Rhizobacteria from Calcareous Soil with Biocontrol Activity Promote Plant Growth and Mitigate Salinity Stress

Microorganisms ◽

10.3390/microorganisms9081588 ◽

2021 ◽

Vol 9 (8) ◽

pp. 1588

Author(s):

Anastasia Venieraki ◽

Styliani N. Chorianopoulou ◽

Panagiotis Katinakis ◽

Dimitris L. Bouranis

Keyword(s):

Plant Growth ◽

Salinity Stress ◽

Calcareous Soil ◽

In Vitro Studies ◽

Pgp Traits ◽

Biocontrol Activity ◽

Plant Growth Promoting ◽

Growth Promoting ◽

Microbial Fertilizers

Plant growth promoting rhizobacteria (PGPR) can be functional microbial fertilizers and/or biological control agents, contributing to an eco-spirit and safe solution for chemical replacement. Therefore, we have isolated rhizospheric arylsulfatase (ARS)-producing bacteria, belonging to Pseudomonas and Bacillus genus, from durum wheat crop grown on calcareous soil. These isolates harbouring plant growth promoting (PGP) traits were further evaluated in vitro for additional PGP traits, including indole compounds production and biocontrol activity against phytopathogens, limiting the group of multi-trait strains to eight. The selected bacterial strains were further evaluated for PGP attributes associated with biofilm formation, compatibility, salt tolerance ability and effect on plant growth. In vitro studies demonstrated that the multi-trait isolates, Bacillus (1.SG.7, 5.SG.3) and Pseudomonas (2.SG.20, 2.C.19) strains, enhanced the lateral roots abundance and shoots biomass, mitigated salinity stress, suggesting the utility of beneficial ARS-producing bacteria as potential microbial fertilizers. Furthermore, in vitro studies demonstrated that compatible combinations of multi-trait isolates, Bacillus sp. 1.SG.7 in a mixture coupled with 5.SG.3, and 2.C.19 with 5.SG.3 belonging to Bacillus and Pseudomonas, respectively, may enhance plant growth as compared to single inoculants.

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Interactive effect of biochar and plant growth-promoting bacterial endophytes on ameliorating salinity stress in maize

Functional Plant Biology ◽

10.1071/fp15054 ◽

2015 ◽

Vol 42 (8) ◽

pp. 770 ◽

Cited By ~ 63

Author(s):

Saqib Saleem Akhtar ◽

Mathias Neumann Andersen ◽

Muhammad Naveed ◽

Zahir Ahmad Zahir ◽

Fulai Liu

Keyword(s):

Plant Growth ◽

Salinity Stress ◽

Crop Production ◽

Interactive Effect ◽

Nutrient Balance ◽

Bacterial Strains ◽

Negative Effects ◽

Plant Growth Promoting ◽

Growth Promoting ◽

Salt Affected Soils

The objective of this work was to study the interactive effect of biochar and plant growth-promoting endophytic bacteria containing 1-aminocyclopropane-1-carboxylate deaminase and exopolysaccharide activity on mitigating salinity stress in maize (Zea mays L.). The plants were grown in a greenhouse under controlled conditions, and were subjected to separate or combined treatments of biochar (0% and 5%, w/w) and two endophytic bacterial strains (Burkholderia phytofirmans (PsJN) and Enterobacter sp. (FD17)) and salinity stress. The results indicated that salinity significantly decreased the growth of maize, whereas both biochar and inoculation mitigated the negative effects of salinity on maize performance either by decreasing the xylem Na+ concentration ([Na+]xylem) uptake or by maintaining nutrient balance within the plant, especially when the two treatments were applied in combination. Moreover, in biochar-amended saline soil, strain FD17 performed significantly better than did PsJN in reducing [Na+]xylem. Our results suggested that inoculation of plants with endophytic baterial strains along with biochar amendment could be an effective approach for sustaining crop production in salt-affected soils.

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Combined effects of the plant growth-promoting bacterium Pseudomonas putida UW4 and salinity stress on the Brassica napus proteome

Applied Soil Ecology ◽

10.1016/j.apsoil.2011.10.006 ◽

2012 ◽

Vol 61 ◽

pp. 255-263 ◽

Cited By ~ 61

Author(s):

Zhenyu Cheng ◽

Owen Z. Woody ◽

Brendan J. McConkey ◽

Bernard R. Glick

Keyword(s):

Brassica Napus ◽

Plant Growth ◽

Pseudomonas Putida ◽

Salinity Stress ◽

Combined Effects ◽

Plant Growth Promoting ◽

Growth Promoting

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Plant growth, ion accumulation, and antioxidant enzymes of endophyte-infected and endophyte-free tall fescue to salinity stress

Acta Physiologiae Plantarum ◽

10.1007/s11738-021-03268-4 ◽

2021 ◽

Vol 43 (6) ◽

Author(s):

Lu Pan ◽

Shimao Cui ◽

Randy D. Dinkins ◽

Yiwei Jiang

Keyword(s):

Antioxidant Enzymes ◽

Plant Growth ◽

Salinity Stress ◽

Tall Fescue ◽

Ion Accumulation

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Contribution of Mycorrhizal Fungi on Growth and Salinity Resistance of Citrus Roots (Citrus, Sp)

Nabatia ◽

10.21070/nabatia.v9i1.1446 ◽

2021 ◽

Vol 9 (1) ◽

Author(s):

Palupi N.P

Keyword(s):

Abiotic Stress ◽

Plant Growth ◽

Salinity Stress ◽

Mycorrhizal Fungi ◽

High Salinity ◽

Plant Root ◽

Antioxidant Defenses ◽

Enzymatic Antioxidant ◽

Ros Formation ◽

Salinity Resistance

Abiotic stress conditions with high salinity cause a decrease in plant growth and production in citrus plants. The application of mycorrhizal fungi with various species is expected to be able to overcome this problem to improve plant root conditions. The results showed that the application of mycorrhizal fungi was able to improve roots so as to increase nutrient absorption, be able to maintain plant conditions under salinity stress gradually, and be able to increase the capacity of higher seedlings to control ROS formation and to activate enzymatic and non-enzymatic antioxidant defenses.

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