scholarly journals Deciphering the Symbiotic Plant Microbiome: Translating the Most Recent Discoveries on Rhizobia for the Improvement of Agricultural Practices in Metal-Contaminated and High Saline Lands

Agronomy ◽  
2019 ◽  
Vol 9 (9) ◽  
pp. 529 ◽  
Author(s):  
Agnese Bellabarba ◽  
Camilla Fagorzi ◽  
George C. diCenzo ◽  
Francesco Pini ◽  
Carlo Viti ◽  
...  
Keyword(s):  
Plant Growth ◽  
Crop Yield ◽  
Heavy Metal Contamination ◽  
Agricultural Practices ◽  
Plant Growth Promoting Rhizobacteria ◽  
Plant Genome ◽  
Biotic And Abiotic Stresses ◽  
Beneficial Effects ◽  
Plant Growth Promoting ◽  
Growth Promoting

Rhizosphere and plant-associated microorganisms have been intensely studied for their beneficial effects on plant growth and health. These mainly include nitrogen-fixing bacteria (NFB) and plant-growth promoting rhizobacteria (PGPR). This beneficial fraction is involved in major functions such as plant nutrition and plant resistance to biotic and abiotic stresses, which include water deficiency and heavy-metal contamination. Consequently, crop yield emerges as the net result of the interactions between the plant genome and its associated microbiome. Here, we provide a review covering recent studies on PGP rhizobia as effective inoculants for agricultural practices in harsh soil, and we propose models for inoculant combinations and genomic manipulation strategies to improve crop yield.

scholarly journals Plant growth promoting rhizobacteria: Beneficial effects for healthy and sustainable agriculture

2016 ◽  
Vol 15 (27) ◽  
pp. 1452-1463 ◽  
Author(s):  
Agossou Noumavo Pac ocirc me ◽  
Adouk egrave Agbodjato Nad egrave ge ◽  
Baba Moussa Farid ◽  
Adjanohoun Adolphe ◽  
Baba Moussa Lamine
Keyword(s):  
Plant Growth ◽  
Sustainable Agriculture ◽  
Plant Growth Promoting Rhizobacteria ◽  
Beneficial Effects ◽  
Plant Growth Promoting ◽  
Growth Promoting

scholarly journals Bioinoculants in Technological Alleviation of Climatic Stress in Plants

2021 ◽  
Author(s):  
Rafia Younas ◽  
Shiza Gul ◽  
Rehan Ahmad ◽  
Ali Raza Khan ◽  
Mumtaz Khan ◽  
...  
Keyword(s):  
Plant Growth ◽  
Cold Stress ◽  
Stress Proteins ◽  
Global Climate ◽  
Agricultural Practices ◽  
Plant Growth Promoting Rhizobacteria ◽  
Growth And Yield ◽  
Plant Growth Promoting ◽  
Growth Promoting ◽  
Semi Arid

Global climate change is leading to a series of frequent onset of environmental stresses such as prolonged drought periods, dynamic precipitation patterns, heat stress, and cold stress on plants and commercial crops. The increasing severity of such stresses is not only making agriculture and related economic sector vulnerable but also negatively influences plant diversity patterns. The global temperature of planet Earth has risen to 1.1°C since the last 19th century. An increase in surface temperature leads to an increase in soil temperature which ultimately reduces water content in the soil, thereby, reducing crop growth and yield. Moreover, this situation is becoming more intense for agricultural practices in arid and semi-arid regions. To overcome climatically induced stresses, acclimatization of plant species via bioinoculation with Plant Growth Promoting Rhizobacteria (PGPR) is becoming an effective approach. The PGPR are capable of colonizing rhizosphere (exophytes) as well as plant organs (endophytes), where they trigger an accumulation of osmolytes for osmoregulation or improving gene expression of heat or cold stress proteins, or by signaling the synthesis of phytohormones, metabolites, proteins, and antioxidants to scavenge reactive oxygen species. Thus, PGPR exhibiting multiple plant growth-promoting traits can be employed via bioinoculants to improve the plant’s tolerance against unfavorable stress conditions.

scholarly journals Roles of Plant Growth-Promoting Rhizobacteria (PGPR) in Stimulating Salinity Stress Defense in Plants: A Review

2021 ◽  
Vol 22 (6) ◽  
pp. 3154
Author(s):  
Dung Minh Ha-Tran ◽  
Trinh Thi My Nguyen ◽  
Shih-Hsun Hung ◽  
Eugene Huang ◽  
Chieh-Chen Huang
Keyword(s):  
Salt Stress ◽  
Plant Growth ◽  
Crop Yields ◽  
Agricultural Practices ◽  
Plant Growth Promoting Rhizobacteria ◽  
Significant Loss ◽  
Seed Vigor ◽  
Plant Growth Promoting ◽  
Growth Promoting ◽  
Seed Biopriming

To date, soil salinity becomes a huge obstacle for food production worldwide since salt stress is one of the major factors limiting agricultural productivity. It is estimated that a significant loss of crops (20–50%) would be due to drought and salinity. To embark upon this harsh situation, numerous strategies such as plant breeding, plant genetic engineering, and a large variety of agricultural practices including the applications of plant growth-promoting rhizobacteria (PGPR) and seed biopriming technique have been developed to improve plant defense system against salt stress, resulting in higher crop yields to meet human’s increasing food demand in the future. In the present review, we update and discuss the advantageous roles of beneficial PGPR as green bioinoculants in mitigating the burden of high saline conditions on morphological parameters and on physio-biochemical attributes of plant crops via diverse mechanisms. In addition, the applications of PGPR as a useful tool in seed biopriming technique are also updated and discussed since this approach exhibits promising potentials in improving seed vigor, rapid seed germination, and seedling growth uniformity. Furthermore, the controversial findings regarding the fluctuation of antioxidants and osmolytes in PGPR-treated plants are also pointed out and discussed.

scholarly journals PGPR Bacteria - Promising Objects to Create BIOFERTILIZERS of Complex Action

2020 ◽  
Author(s):  
A.B. Abdykadyrova ◽  
R. Aipova ◽  
B.O. Raisov ◽  
A.A. Kurmanbaev
Keyword(s):  
Heavy Metal ◽  
Plant Growth ◽  
Survival Data ◽  
Heavy Metal Contamination ◽  
Molecular Nitrogen ◽  
Plant Growth Promoting Rhizobacteria ◽  
Soil Salinization ◽  
Plant Diseases ◽  
Plant Growth Promoting ◽  
Growth Promoting

The review summarizes literature data and the results of the authors own research on the agronomically useful group of soil microorganisms stimulating plant growth (plant-growth-promoting rhizobacteria - PGPR bacteria). PGPRs have great potential for plant growth promoting as they control pest and disease and have been considered important in sustainable agriculture. PGPR includes a promising group of bacteria that live on the surface and inside the roots of agricultural plants. They possess a number of positive properties such as fixation of molecular nitrogen of the atmosphere, decomposition of harmful chemical compounds, synthesis of substances of a hormonal nature, are able to transform difficult phosphorus soil compounds, and also prevent or reduce the growth of phytopathogens due to the ability to synthesize substances with bactericidal and fungicidal effects, as well as competition for ions iron, without which the growth of phytopathogens is difficult. In addition, PGPR bacteria provide plant resistance to adverse environmental factors: heavy metal pollution of the soil, soil salinization, and drought. Under stress caused by heavy metal contamination of the soil, PGPR bacteria enhance plant survival. Data are presented showing the prospects of using these microorganisms in the development of technologies of ecological farming in order to increase plant productivity, biocontrol over the development of plant diseases, reduce the chemical load on the soil, increase its fertility.

scholarly journals Plant Growth Promoting Rhizobacterial Biofertilizers for Sustainable Crop Production: The Past, Present, and Future

2020 ◽  
Author(s):  
Becky N. Aloo ◽  
Billy A. Makumba ◽  
Ernest R. Mbega
Keyword(s):  
Plant Growth ◽  
Crop Production ◽  
Crop Yields ◽  
Agricultural Practices ◽  
Plant Growth Promoting Rhizobacteria ◽  
Full Potential ◽  
Sustainable Crop Production ◽  
Indigenous Plant ◽  
Plant Growth Promoting ◽  
Growth Promoting

The world’s population is increasing and so are agricultural activities to match the growing demand for food. Conventional agricultural practices generally employ artificial fertilizers to increase crop yields, but these have multiple environmental and human health effects. For decades, environmentalists and sustainability researchers have focused on alternative crop fertilization mechanisms to address these challenges, and biofertilizers have constantly been researched, recommended, and even successfully-adopted for several crops. Biofertilizers are microbial formulations made of indigenous plant growth-promoting rhizobacteria (PGPR) which can naturally improve plant growth either directly or indirectly, through the production of phytohormones, solubilization of soil nutrients, and production of iron-binding metabolites; siderophores. Biofertilizers, therefore, hold immense potential as tools for sustainable crop production especially in the wake of climate change and global warming. Despite the mounting interest in this technology, their full potential has not yet been realized. This review updates our understanding of the PGPR biofertilizers and sustainable crop production. It evaluates the history of these microbial products, assesses their present state of utilization, and also critically propounds on their future prospects for sustainable crop production. Such information is desirable to fully evaluate their potential and can ultimately pave the way for their increased adoption for crop production.

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