scholarly journals Cell-Free Supernatants of Plant Growth-Promoting Bacteria: A Review of Their Use as Biostimulant and Microbial Biocontrol Agents in Sustainable Agriculture

2020 ◽  
Vol 12 (23) ◽  
pp. 9917
Author(s):  
Marika Pellegrini ◽  
Giancarlo Pagnani ◽  
Matteo Bernardi ◽  
Alessandro Mattedi ◽  
Daniela M. Spera ◽  
...  
Keyword(s):  
Plant Growth ◽  
Sustainable Agriculture ◽  
Biocontrol Agents ◽  
Future Research ◽  
Plant Growth Promoting Bacteria ◽  
Bacterial Survival ◽  
Agricultural Applications ◽  
Plant Growth Promoting ◽  
Growth Promoting ◽  
Microbial Biocontrol Agents

Plant growth-promoting bacteria (PGPB) afford plants several advantages (i.e., improvement of nutrient acquisition, growth, and development; induction of abiotic and biotic stress tolerance). Numerous PGPB strains have been isolated and studied over the years. However, only a few of them are available on the market, mainly due to the failed bacterial survival within the formulations and after application inside agroecosystems. PGPB strains with these challenging limitations can be used for the formulation of cell-free supernatants (CFSs), broth cultures processed through several mechanical and physical processes for cell removal. In the scientific literature there are diverse reviews and updates on PGPB in agriculture. However, no review deals with CFSs and the CFS metabolites obtainable by PGPB. The main objective of this review is to provide useful information for future research on CFSs as biostimulant and biocontrol agents in sustainable agriculture. Studies on CFS agricultural applications, both for biostimulant and biocontrol applications, have been reviewed, presenting limitations and advantages. Among the 109 articles selected and examined, the Bacillus genus seems to be the most promising due to the numerous articles that support its biostimulant and biocontrol potentialities. The present review underlines that research about this topic needs to be encouraged; evidence so far obtained has demonstrated that PGPB could be a valid source of secondary metabolites useful in sustainable agriculture.

scholarly journals A Multifactorial Approach to Untangle Graphene Oxide (GO) Nanosheets Effects on Plants: Plant Growth-Promoting Bacteria Inoculation, Bacterial Survival, and Drought

Nanomaterials ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 771
Author(s):  
Tiago Lopes ◽  
Catarina Cruz ◽  
Paulo Cardoso ◽  
Ricardo Pinto ◽  
Paula A. A. P. Marques ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Plant Growth ◽  
Food Production ◽  
Plant Growth Promoting Bacteria ◽  
Bacterial Survival ◽  
Maize Seedlings ◽  
Combined Application ◽  
Plant Growth Promoting ◽  
Growth Promoting ◽  
Rhizobium Sp

Drought is a limiting factor for agricultural productivity. Climate change threatens to expand the areas of the globe subjected to drought, as well as to increase the severity and duration of water shortage. Plant growth-promoting bacteria (PGPB) are widely studied and applied as biostimulants to increase plant production and to enhance tolerance to abiotic and biotic constraints. Besides PGPB, studies on the potential of nanoparticles to be used as biostimulants are also thriving. However, many studies report toxicity of tested nanoparticles in bacteria and plants in laboratory conditions, but few studies have reported effects of nanoparticles towards bacterial cells and communities in the soil. The combined application of nanoparticles and PGPB as biostimulant formulations are poorly explored and it is important to unravel the potentialities of their combined application as a way to potentiate food production. In this study, Rhizobium sp. E20-8 and graphene oxide (GO) nanosheets were applied on container-grown maize seedlings in watered and drought conditions. Bacterial survival, seedling growth (dry weight), and biochemical endpoints (photosynthetic pigments, soluble and insoluble carbohydrates, proline, lipid peroxidation, protein, electron transport system, and superoxide dismutase) were evaluated. Results showed that the simultaneous exposure to GO and Rhizobium sp. E20-8 was able to alleviate the stress induced by drought on maize seedlings through osmotic and antioxidant protection by GO and mitigation of GO effects on the plant’s biochemistry by Rhizobium sp. E20-8. These results constitute a new lead on the development of biostimulant formulations to improve plant performance and increase food production in water-limited conditions.

Plant growth promoting bacteria as biocontrol agents against diseases of cereal crops

2021 ◽  
pp. 221-239
Author(s):  
Divya Singh ◽  
Sandeep Kumar Singh ◽  
Vipin Kumar Singh ◽  
Sougata Ghosh ◽  
Hariom Verma ◽  
...  
Keyword(s):  
Plant Growth ◽  
Biocontrol Agents ◽  
Cereal Crops ◽  
Plant Growth Promoting Bacteria ◽  
Plant Growth Promoting ◽  
Growth Promoting

scholarly journals Current Advances in Plant Growth Promoting Bacteria Alleviating Salt Stress for Sustainable Agriculture

2020 ◽  
Vol 10 (20) ◽  
pp. 7025
Author(s):  
Slimane Mokrani ◽  
El-hafid Nabti ◽  
Cristina Cruz
Keyword(s):  
Plant Growth ◽  
Sustainable Agriculture ◽  
Agricultural Soils ◽  
Crop Productivity ◽  
Modern World ◽  
Saline Stress ◽  
Plant Growth Promoting Bacteria ◽  
Stress Alleviation ◽  
Plant Growth Promoting ◽  
Growth Promoting

Humanity in the modern world is confronted with diverse problems at several levels. The environmental concern is probably the most important as it threatens different ecosystems, food, and farming as well as humans, animals, and plants. More specifically, salinization of agricultural soils is a global concern because of on one side, the permanent increase of the areas affected, and on the other side, the disastrous damage caused to various plants affecting hugely crop productivity and yields. Currently, great attention is directed towards the use of Plant Growth Promoting Bacteria (PGPB). This alternative method, which is healthy, safe, and ecological, seems to be very promising in terms of simultaneous salinity alleviation and improving crop productivity. This review attempts to deal with different aspects of the current advances concerning the use of PGPBs for saline stress alleviation. The objective is to explain, discuss, and present the current progress in this area of research. We firstly discuss the implication of PGPB on soil desalinization. We present the impacts of salinity on crops. We look for the different salinity origin and its impacts on plants. We discuss the impacts of salinity on soil. Then, we review various recent progress of hemophilic PGPB for sustainable agriculture. We categorize the mechanisms of PGPB toward salinity tolerance. We discuss the use of PGPB inoculants under salinity that can reduce chemical fertilization. Finally, we present some possible directions for future investigation. It seems that PGPBs use for saline stress alleviation gain more importance, investigations, and applications. Regarding the complexity of the mechanisms implicated in this domain, various aspects remain to be elucidated.

Role of plant growth-promoting bacteria in sustainable agriculture

2020 ◽  
Vol 30 ◽  
pp. 101842 ◽  
Author(s):  
Priyanka Pathania ◽  
Ankita Rajta ◽  
Poonam C. Singh ◽  
Ranjana Bhatia
Keyword(s):  
Plant Growth ◽  
Sustainable Agriculture ◽  
Plant Growth Promoting Bacteria ◽  
Plant Growth Promoting ◽  
Growth Promoting
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