Direct and Residual Effects of Water Deficit Stress, Different Sources of Silicon and Plant-Growth Promoting Bacteria on Silicon Fractions in the Soil

Silicon ◽  
2021 ◽  
Author(s):  
Keyvan Valizadeh-rad ◽  
Babak Motesharezadeh ◽  
Hossein Ali Alikhani ◽  
Mahboubeh Jalali
Keyword(s):  
Plant Growth ◽  
Water Deficit ◽  
Residual Effects ◽  
Water Deficit Stress ◽  
Plant Growth Promoting Bacteria ◽  
Plant Growth Promoting ◽  
Growth Promoting ◽  
Different Sources

scholarly journals Biofilm Producing Rhizobacteria With Multiple Plant Growth-Promoting Traits Promote Growth of Tomato Under Water-Deficit Stress

2020 ◽  
Vol 11 ◽  
Author(s):  
Md. Manjurul Haque ◽  
Md Khaled Mosharaf ◽  
Moriom Khatun ◽  
Md. Amdadul Haque ◽  
Md. Sanaullah Biswas ◽  
...  
Keyword(s):  
Plant Growth ◽  
Water Deficit ◽  
Xanthomonas Campestris ◽  
Plant Pathogens ◽  
Water Deficit Stress ◽  
Rrna Gene ◽  
Growth Promoters ◽  
Plant Growth Promoting ◽  
Growth Promoting ◽  
Plant Growth Promoting Traits

Plant growth-promoting rhizobacteria (PGPR) not only enhance plant growth but also control phytopathogens and mitigate abiotic stresses, including water-deficit stress. In this study, 21 (26.9%) rhizobacterial strains isolated from drought-prone ecosystems of Bangladesh were able to form air–liquid (AL) biofilms in the glass test tubes containing salt-optimized broth plus glycerol (SOBG) medium. Based on 16S rRNA gene sequencing, Pseudomonas chlororaphis (ESR3 and ESR15), P. azotoformans ESR4, P. poae ESR6, P. fluorescens (ESR7 and ESR25), P. gessardii ESR9, P. cedrina (ESR12, ESR16, and ESR23), P. veronii (ESR13 and ESR21), P. parafulva ESB18, Stenotrophomonas maltophilia ESR20, Bacillus cereus (ESD3, ESD21, and ESB22), B. horikoshii ESD16, B. aryabhattai ESB6, B. megaterium ESB9, and Staphylococcus saprophyticus ESD8 were identified. Fourier transform infrared spectroscopy studies showed that the biofilm matrices contain proteins, polysaccharides, nucleic acids, and lipids. Congo red binding results indicated that these bacteria produced curli fimbriae and nanocellulose-rich polysaccharides. Expression of nanocellulose was also confirmed by Calcofluor binding assays and scanning electron microscopy. In vitro studies revealed that all these rhizobacterial strains expressed multiple plant growth-promoting traits including N2 fixation, production of indole-3-acetic acid, solubilization of nutrients (P, K, and Zn), and production of ammonia, siderophores, ACC deaminase, catalases, lipases, cellulases, and proteases. Several bacteria were also tolerant to multifarious stresses such as drought, high temperature, extreme pH, and salinity. Among these rhizobacteria, P. cedrina ESR12, P. chlororaphis ESR15, and B. cereus ESD3 impeded the growth of Xanthomonas campestris pv. campestris ATCC 33913, while P. chlororaphis ESR15 and B. cereus ESD21 prevented the progression of Ralstonia solanacearum ATCC® 11696TM. In a pot experiment, tomato plants inoculated with P. azotoformans ESR4, P. poae ESR6, P. gessardii ESR9, P. cedrina ESR12, P. chlororaphis ESR15, S. maltophilia ESR20, P. veronii ESR21, and B. aryabhattai ESB6 exhibited an increased plant growth compared to the non-inoculated plants under water deficit-stressed conditions. Accordingly, the bacterial-treated plants showed a higher antioxidant defense system and a fewer tissue damages than non-inoculated plants under water-limiting conditions. Therefore, biofilm-producing PGPR can be utilized as plant growth promoters, suppressors of plant pathogens, and alleviators of water-deficit stress.

scholarly journals Comparative Effects of Individual and Consortia Plant Growth Promoting Bacteria on Physiological and Enzymatic Mechanisms to Confer Drought Tolerance in Maize (Zea mays L.)

2021 ◽  
Author(s):  
Muhammad Saleem ◽  
Fahim Nawaz ◽  
Muhammad Baqir Hussain ◽  
Rao Muhammad Ikram
Keyword(s):  
Drought Tolerance ◽  
Plant Growth ◽  
Water Deficit ◽  
Pot Experiment ◽  
Antioxidant Systems ◽  
Plant Growth Promoting Bacteria ◽  
Bacterial Strains ◽  
Plant Growth Promoting ◽  
Growth Promoting ◽  
The Individual

AbstractMitigation strategies based on plant–microbe interactions to increase the performance of plants under water-deficit conditions are well documented. However, little is known about a suitable consortium of bacterial inoculants and underlying physiological and enzymatic events to improve drought tolerance in maize. We performed laboratory and pot experiments to understand the synergistic interactions among plant growth-promoting bacteria to alleviate the drought-induced damages in maize. Initially, ten bacterial strains were evaluated for their osmotic stress tolerance capacity by growing them in a media containing 0, 10, 20, and 30% polyethylene glycol (PEG-6000). Also, the seeds of a drought tolerant (NK-6654) and sensitive (SD-626) maize cultivar were inoculated with these bacterial strains in the first pot experiment to determine their effects on the growth and physiological processes. Later, in the second pot experiment, the best performing inoculants were selected to study the individual and synergistic effects of bacterial inoculation to confer drought tolerance in maize. Our findings showed that the inoculation with tolerant strains resulted in higher photosynthetic activity (25–39%), maintenance of leaf water status (14–18%) and pigments (27–32%), and stimulation of antioxidant machinery (28–38%) than no inoculation in water-stressed maize seedlings. Moreover, the treatment with bacteria consortia further stimulated the drought protective mechanisms and resulted in higher efficiency of photosynthetic (47–61%) and antioxidant systems (42–62%) than the individual inoculants under water-deficit conditions. We conclude that the inoculation with microbial consortia regulates water uptake, photosynthetic performance, and stress metabolites to minimize drought-induced damages in maize.

Inoculation of plant growth promoting bacteria and arbuscular mycorrhizal fungi improve chickpea performance under water deficit conditions

2021 ◽  
Vol 164 ◽  
pp. 103927
Author(s):  
Sara Laranjeira ◽  
Anabela Fernandes-Silva ◽  
Sara Reis ◽  
Cristina Torcato ◽  
Fernando Raimundo ◽  
...  
Keyword(s):  
Plant Growth ◽  
Arbuscular Mycorrhizal Fungi ◽  
Water Deficit ◽  
Mycorrhizal Fungi ◽  
Arbuscular Mycorrhizal ◽  
Plant Growth Promoting Bacteria ◽  
Plant Growth Promoting ◽  
Growth Promoting

scholarly journals Do plant-growth promoting bacteria contribute to greater persistence of tropical pastures in water deficit? - A review

2020 ◽  
Vol 9 (8) ◽  
Author(s):  
Divaney Mamédio ◽  
Ulysses Cecato ◽  
Renan Sanches ◽  
Sillas Mayron da Silva da Silva ◽  
Diogo Rodrigues da Silva ◽  
...  
Keyword(s):  
Plant Growth ◽  
Water Deficit ◽  
Negative Impact ◽  
Innovative Technology ◽  
Plant Growth Promoting Bacteria ◽  
Forage Production ◽  
Tropical Pastures ◽  
Positive Effects ◽  
Plant Growth Promoting ◽  
Growth Promoting

The use of plant-growth promoting bacteria (PGPB) in pastures is a sustainable alternative to increment forage production. Besides, it is an innovative technology that can mitigate the effects of water deficit (WD) in pastures. Currently, WD is one of the main abiotic stressor agents responsible for a negative impact on agricultural production. Permanent or temporary WD imposes limitations on the growth and development of forage plants more than any other environmental factors. Although there have been studies for many years to improve resistance to WD and efficiency in water usage, the mechanism involved in the process is still not clear. A better understanding of the relations between plant and water and the mechanisms of tolerance to WD can significantly improve pastures productivity and environmental quality. Despite the mechanisms that allow plants to adjust as a response to WD, depending on its severity and duration plants are not capable to survive the stress by themselves. For that reason, the use of technologies such as PGPB can make them more resistant to WD without jeopardizing their development and productivity. There are studies that show the positive effects of PGPB in grasses during WD. In this review, we are going to present an overview of the causes, effects and responses of the inoculation of PGPB in grasses exposed to water deficit.

Isolation and identification of plant growth-promoting bacteria associated with tall fescue

2009 ◽  
pp. 211-216 ◽  
Author(s):  
J. Monk ◽  
E. Gerard ◽  
S. Young ◽  
K. Widdup ◽  
M. O'Callaghan
Keyword(s):  
New Zealand ◽  
Plant Growth ◽  
Tall Fescue ◽  
Festuca Arundinacea ◽  
Plant Growth Promoting Bacteria ◽  
Beneficial Bacteria ◽  
Isolation And Identification ◽  
Naturally Occurring ◽  
Plant Growth Promoting ◽  
Growth Promoting

Tall fescue (Festuca arundinacea) is a useful alternative to ryegrass in New Zealand pasture but it is slow to establish. Naturally occurring beneficial bacteria in the rhizosphere can improve plant growth and health through a variety of direct and indirect mechanisms. Keywords: rhizosphere, endorhiza, auxin, siderophore, P-solubilisation

Effect of plant growth promoting bacteria and drought on spring maize (Zea mays L.)

2020 ◽  
Vol 53 (2) ◽  
Author(s):  
Muhammad Mubeen ◽  
Asghari Bano ◽  
Barkat Ali ◽  
Zia Ul Islam ◽  
Ashfaq Ahmad ◽  
...  
Keyword(s):  
Zea Mays ◽  
Plant Growth ◽  
Zea Mays L ◽  
Plant Growth Promoting Bacteria ◽  
Spring Maize ◽  
Plant Growth Promoting ◽  
Growth Promoting
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