Status and Prospects of Bacterial Inoculants for Sustainable Management of Agroecosystems

Adeleke, Rasheed; Raimi, Adekunle; Roopnarain, Ashira; Mokubedi, Sharon M.

doi:10.1007/978-3-030-18933-4_7

Cited by 22 publications

(12 citation statements)

References 149 publications

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“…Bioprospecting for beneficial microbes in diverse environments has been a key strategy for discovering novel and efficient bacterial strains to drive the production of quality microbial inoculant, a major resource in developing sustainable agroecosystems. Interestingly, several environments such as the rhizosphere, soil, and composts (Adeleke, Raimi, et al., 2019; Ahkami et al., 2017; Raimi et al., 2022), have been well studied for ecologically beneficial microbes. However, niches, including plant tissues, are rarely investigated for their phytobeneficial microbes, such as endophytes.…”

Section: Discussionmentioning

confidence: 99%

16S rRNA gene‐based identification and plant growth‐promoting potential of cultivable endophytic bacteria

Raimi

Adeleke

2023

Agronomy Journal

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Endophytic bacteria play essential roles in plant growth and fitness through nitrogen fixation, nutrient solubilization, and phytohormone production. However, the plant growth-promoting (PGP) potential of endophytic microorganisms inhabiting vegetables is underexplored. Thus, this study investigated the endophytic bacteria of vegetable crops for their PGP properties using the culture-dependent technique. Recovered isolates were identified by sequencing the partial 16S rRNA gene using Sanger sequencing. The isolated endophytic bacteria belonged to 15 genera and 39 different species. Bacillus, Enterobacter, Pantoea, and Pseudomonas were the predominant genera and had high phosphate solubilization and siderophore production potential. The isolates differentially produced indole-3-acetic acid and ammonium in the range 0.14-44.48 μg mL -1 and 0.77-93.24 mg L -1 , respectively. Pseudomonas azotoformans, Stenotrophomonas maltophilia, and Serratia liquefaciens showed a high level of siderophore production, which was not significantly (p > 0.05) different across the plant and organ types. More than 21% of endophytes could produce gelatinase, protease, amylase, and cellulase, contributing to their diverse ecosystem functions. Bacterial density and species composition varied across the vegetable species, organs, and farm locations but were higher in the stems compared with other organs. However, the vegetable organ had no significant (p > 0.05) influence on the bacterial population density, except for the interaction of plant species and organs.Overall, this study provides basic knowledge about the cultivable endophytic bacterial community of vegetables and reveals diverse endophytic bacteria useful in bioinoculant formulations for improving crop productivity.

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Section: Discussionmentioning

confidence: 99%

16S rRNA gene‐based identification and plant growth‐promoting potential of cultivable endophytic bacteria

Raimi

Adeleke

2023

Agronomy Journal

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“…Some efficient N-fixing strains such as Rhizobium and Azotobacter spp. have successfully been formulated into commercial biofertilizers (Adeleke et al, 2019). However, the commercially available N biofertilizers mostly consist of Rhizobium and a few other bacteria such as Azotobacter, and Azospirillum species and are widely applicable to legume crops as presented in Section 4 (Vassilev et al, 2015;Adeleke et al, 2019).…”

Section: Figurementioning

confidence: 99%

“…have successfully been formulated into commercial biofertilizers (Adeleke et al, 2019). However, the commercially available N biofertilizers mostly consist of Rhizobium and a few other bacteria such as Azotobacter, and Azospirillum species and are widely applicable to legume crops as presented in Section 4 (Vassilev et al, 2015;Adeleke et al, 2019). Nevertheless, inoculating crops and farms with such biofertilizers can meet the required N levels by plants and substantially reduce the application of artificial fertilizers (Aloo et al, 2022a).…”

Section: Figurementioning

confidence: 99%

Plant growth-promoting rhizobacterial biofertilizers for crop production: The past, present, and future

et al. 2022

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Recent decades have witnessed increased agricultural production to match the global demand for food fueled by population increase. Conventional agricultural practices are heavily reliant on artificial fertilizers that have numerous human and environmental health effects. Cognizant of this, sustainability researchers and environmentalists have increased their focus on other crop fertilization mechanisms. Biofertilizers are microbial formulations constituted of indigenous plant growth-promoting rhizobacteria (PGPR) that directly or indirectly promote plant growth through the solubilization of soil nutrients, and the production of plant growth-stimulating hormones and iron-sequestering metabolites called siderophores. Biofertilizers have continually been studied, recommended, and even successfully adopted for the production of many crops in the world. These microbial products hold massive potential as sustainable crop production tools, especially in the wake of climate change that is partly fueled by artificial fertilizers. Despite the growing interest in the technology, its full potential has not yet been achieved and utilization still seems to be in infancy. There is a need to shed light on the past, current, and future prospects of biofertilizers to increase their understanding and utility. This review evaluates the history of PGPR biofertilizers, assesses their present utilization, and critically advocates their future in sustainable crop production. It, therefore, updates our understanding of the evolution of PGPR biofertilizers in crop production. Such information can facilitate the evaluation of their potential and ultimately pave the way for increased exploitation.

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“…There are already many bacterial biofertilizers in commercial use [ 3 ]. The most common are based on nitrogen-fixing microbes, such as Nitragin Gold ® containing Rhizobia , produced in the USA [ 126 ]; Nodulest 10 with Bradyrhizobium japonicum, from Argentina, or Azo-N with Azospirillum brasilense and Azospirillum lipoferum, from South Africa [ 3 , 127 ]. Some commercial biofertilizers are based on phosphate solubilizers, such as Phosphobacterin with Bacillus megaterium from Russia, or potassium solubilizers, such as K Sol B with Frateuria aurantia , from India [ 3 ].…”

Section: Plant Growth Promoting Bacteria (Pgpb)mentioning

confidence: 99%

“…Some commercial biofertilizers are based on phosphate solubilizers, such as Phosphobacterin with Bacillus megaterium from Russia, or potassium solubilizers, such as K Sol B with Frateuria aurantia , from India [ 3 ]. In addition, a few are phytostimulators, such as Amase ® with Pseudomonas azotoformans , and biocontrol agents, such as Cerall ® with Pseudomonas chlororaphis , both from Sweden [ 3 , 127 ].…”

Section: Plant Growth Promoting Bacteria (Pgpb)mentioning

confidence: 99%

The Contrivance of Plant Growth Promoting Microbes to Mitigate Climate Change Impact in Agriculture

2021

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Combating the consequences of climate change is extremely important and critical in the context of feeding the world’s population. Crop simulation models have been extensively studied recently to investigate the impact of climate change on agricultural productivity and food security. Drought and salinity are major environmental stresses that cause changes in the physiological, biochemical, and molecular processes in plants, resulting in significant crop productivity losses. Excessive use of chemicals has become a severe threat to human health and the environment. The use of beneficial microorganisms is an environmentally friendly method of increasing crop yield under environmental stress conditions. These microbes enhance plant growth through various mechanisms such as production of hormones, ACC deaminase, VOCs and EPS, and modulate hormone synthesis and other metabolites in plants. This review aims to decipher the effect of plant growth promoting bacteria (PGPB) on plant health under abiotic soil stresses associated with global climate change (viz., drought and salinity). The application of stress-resistant PGPB may not only help in the combating the effects of abiotic stressors, but also lead to mitigation of climate change. More thorough molecular level studies are needed in the future to assess their cumulative influence on plant development.

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Status and Prospects of Bacterial Inoculants for Sustainable Management of Agroecosystems

Cited by 22 publications

References 149 publications

16S rRNA gene‐based identification and plant growth‐promoting potential of cultivable endophytic bacteria

16S rRNA gene‐based identification and plant growth‐promoting potential of cultivable endophytic bacteria

Plant growth-promoting rhizobacterial biofertilizers for crop production: The past, present, and future

The Contrivance of Plant Growth Promoting Microbes to Mitigate Climate Change Impact in Agriculture

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