Unlocking the potential of plant growth-promoting rhizobacteria on soil health and the sustainability of agricultural systems

Plant growth-promoting rhizobacteria (PGPRs) have the potential to contribute significantly to the development of sustainable agricultural systems. Our understanding at the molecular level of the interactions between these microorganisms, the plant and the environment is growing rapidly, facilitating the development of microbial products. However, their development is hampered by the legislative restrictions on their use and consequently high costs. This is especially true because biocontrol agents are often specific to crops, pathogens and soil types. Nevertheless, promising new products for the improvement of plant establishment and plant growth, such as ‘BioCoat ’ for radish seeds, have entered the market.

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Comparative Effects of Bio-Wastes in Combination with Plant Growth-Promoting Bacteria on Growth and Productivity of Okra

Agronomy ◽

10.3390/agronomy11102065 ◽

2021 ◽

Vol 11 (10) ◽

pp. 2065

Author(s):

Hammad Anwar ◽

Xiukang Wang ◽

Azhar Hussain ◽

Muhammad Rafay ◽

Maqshoof Ahmad ◽

...

Keyword(s):

Plant Growth ◽

Soil Health ◽

Organic Amendments ◽

Plant Growth Promoting Rhizobacteria ◽

Fruit Weight ◽

Growth And Yield ◽

Plant Growth Promoting Bacteria ◽

Randomized Design ◽

Plant Growth Promoting ◽

Growth Promoting

Plant growth-promoting rhizobacteria with multiple growth-promoting traits play a significant role in soil to improve soil health, crop growth and yield. Recent research studies have focused on the integration of organic amendments with plant growth-promoting rhizobacteria (PGPR) to enhance soil fertility and reduce the hazardous effects of chemical fertilizers. This study aims to evaluate the integrated application of biochar, compost, fruit and vegetable waste, and Bacillus subtilis (SMBL 1) to soil in sole application and in combined form. The study comprises eight treatments—four treatments without inoculation and four treatments with SMBL 1 inoculation in a completely randomized design (CRD), under factorial settings with four replications. The results indicate that the integrated treatments significantly improved okra growth and yield compared with sole applications. The integration of SMBL 1 with biochar showed significant improvements in plant height, root length, leaf chlorophyll a and b, leaf relative water content, fruit weight, diameter and length by 29, 29, 50, 53.3, 4.3, 44.7 and 40.4%, respectively, compared with control. Similarly, fruit N, P and K contents were improved by 33, 52.7 and 25.6% and Fe and Zn in shoot were 37.1 and 35.6%, respectively, compared with control. The results of this study reveal that the integration of SMBL 1 with organic amendments is an effective approach to the sustainable production of okra.

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PLANT GROWTH PROMOTING ACTIVITIES OF RHIZOBACTERIA ISOLATED FROM RHIZOSPHERIC SOILS OF RURAL BANGALORE, INDIA

PLANT ARCHIVES ◽

10.51470/plantarchives.2021.v21.no2.007 ◽

2021 ◽

Vol 21 (2) ◽

Author(s):

Sadhana Venkatesh ◽

Sandeep Suryan ◽

Nagananda Govinahalli Shivashankara ◽

Swetha Seshagiri

Keyword(s):

Plant Growth ◽

Agricultural Soils ◽

Soil Health ◽

Plant Growth Promoting Rhizobacteria ◽

Plant Life ◽

Drought And Salt Tolerance ◽

Plant Growth Promoting Activities ◽

Plant Growth Promoting ◽

Acinetobacter Pittii ◽

Growth Promoting

Soil is a dynamic ecosystem which provides support to plant life. Microorganisms inhabiting the rhizosphere region of soil play a key role in agriculture by promoting the exchange of plant nutrients and reducing the application of chemical fertilizers to a large extent. Engineering of rhizospheric region through exploitation of specific microorganisms leads to higher microbial diversity in the soil which in turn plays a significant role in maintaining the soil health. The present work envisages the isolation, screening and biochemical profiling of potent plant growth promoting rhizobacteria from various rhizospheric soils in and around Bangalore. Sixty isolates from rhizospheric region of fourteen different agricultural soils were screened for plant growth promoting traits such as phosphate solubilization, siderophore production, Ammonia, HCN & Phytohormone production. Twelve isolates that exhibited plant growth promotional traits were further subjected to screening for drought and salt tolerance. Among the twelve isolates, four potential isolates namely Serratia marcescens, Pseudomonas aeruginosa and Acinetobacter pittii were identified based on biochemical methods and 16SrRNA sequencing.

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Bacterial Diversity and Community Structure in Typical Plant Rhizosphere

Diversity ◽

10.3390/d11100179 ◽

2019 ◽

Vol 11 (10) ◽

pp. 179 ◽

Cited By ~ 6

Author(s):

Alawiye ◽

Babalola

Keyword(s):

Plant Growth ◽

Soil Health ◽

Plant Growth Promoting Rhizobacteria ◽

Vital Role ◽

Success Story ◽

Bacillus Spp ◽

Plant Growth Promoting ◽

Microbe Interactions ◽

Growth Promoting

Bacteria play a vital role in the quality of soil, health, and the production of plants. This has led to several studies in understanding the diversity and structure in the plant rhizosphere. Over the years, there have been overwhelming advances in molecular biology which have led to the development of omics techniques which utilize RNA, DNA, or proteins as biomolecules; these have been gainfully used in plant–microbe interactions. The bacterial community found in the rhizosphere is known for its colonization around the roots due to availability of nutrients, and composition, and it affects the plant growth directly or indirectly. Metabolic fingerprinting enables a snapshot of the metabolic composition at a given time. We review metabolites with ample information on their benefit to plants and which are found in rhizobacteria such as Pseudomonas spp. and Bacillus spp. Exploring plant-growth-promoting rhizobacteria using omics techniques can be a true success story for agricultural sustainability.

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