<i>In Planta</i> Screening of Maize Seed Endophytic Bacteria for Potential Applications under Dryland Conditions

Bodhankar, Shrey; Grover, Monendra; Reddy, Gopal

doi:10.5958/2231-6701.2019.00009.5

Cited by 11 publications

(8 citation statements)

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“…strain 16i increased the root length and surface area (Jochum et al, 2019). Seed treatment with endophytic bacteria Bacillus subtilis MSEB78 and Corynebacterium hansenii MSEB3 improved chlorophyll content, relative water content, shoot fresh and dry biomass under drought stress (Bodhankar et al, 2019).…”

Section: Pgpr and Abiotic Stress Tolerance In Plantsmentioning

confidence: 96%

“…UPMR18 improved germination percentage, plant growth parameters (shoot fresh weight and root dry weight) and adapted to salinity stress by eliminating reactive oxygen species (ROS) through SOD (superoxide dismutase), CAT (catalase) and APX (Ascorbate peroxidase) activities (Habib et al, 2016). PGPR inoculation increased proline accumulation in soybean, lettuce, wheat, maize plants under abiotic stress conditions (Han and Lee, 2005;Kohler et al, 2009;Zarea et al, 2012;Bodhankar et al, 2019). Salt tolerant PGPR Bacillus aquimaris SU8 accumulated total soluble sugars, improved growth and yield of wheat under saline soil (Upadhyay and Singh, 2014).…”

Section: Pgpr and Abiotic Stress Tolerance In Plantsmentioning

confidence: 99%

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PGPR Mediated Alterations in Root Traits: Way Toward Sustainable Crop Production

Grover

Bodhankar

Sharma

et al. 2021

Front. Sustain. Food Syst.

Self Cite

191

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The above ground growth of the plant is highly dependent on the belowground root system. Rhizosphere is the zone of continuous interplay between plant roots and soil microbial communities. Plants, through root exudates, attract rhizosphere microorganisms to colonize the root surface and internal tissues. Many of these microorganisms known as plant growth promoting rhizobacteria (PGPR) improve plant growth through several direct and indirect mechanisms including biological nitrogen fixation, nutrient solubilization, and disease-control. Many PGPR, by producing phytohormones, volatile organic compounds, and secondary metabolites play important role in influencing the root architecture and growth, resulting in increased surface area for nutrient exchange and other rhizosphere effects. PGPR also improve resource use efficiency of the root system by improving the root system functioning at physiological levels. PGPR mediated root trait alterations can contribute to agroecosystem through improving crop stand, resource use efficiency, stress tolerance, soil structure etc. Thus, PGPR capable of modulating root traits can play important role in agricultural sustainability and root traits can be used as a primary criterion for the selection of potential PGPR strains. Available PGPR studies emphasize root morphological and physiological traits to assess the effect of PGPR. However, these traits can be influenced by various external factors and may give varying results. Therefore, it is important to understand the pathways and genes involved in plant root traits and the microbial signals/metabolites that can intercept and/or intersect these pathways for modulating root traits. The use of advanced tools and technologies can help to decipher the mechanisms involved in PGPR mediated determinants affecting the root traits. Further identification of PGPR based determinants/signaling molecules capable of regulating root trait genes and pathways can open up new avenues in PGPR research. The present review updates recent knowledge on the PGPR influence on root architecture and root functional traits and its benefits to the agro-ecosystem. Efforts have been made to understand the bacterial signals/determinants that can play regulatory role in the expression of root traits and their prospects in sustainable agriculture. The review will be helpful in providing future directions to the researchers working on PGPR and root system functioning.

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Section: Pgpr and Abiotic Stress Tolerance In Plantsmentioning

confidence: 96%

Section: Pgpr and Abiotic Stress Tolerance In Plantsmentioning

confidence: 99%

PGPR Mediated Alterations in Root Traits: Way Toward Sustainable Crop Production

Grover

Bodhankar

Sharma

et al. 2021

Front. Sustain. Food Syst.

Self Cite

191

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“…Selected potential maize seed endophytic bacteria (MSEB-17, MSEB 72 and MSEB 78) used in the present study, were previously isolated from surface sterilized seeds of 3 different genotypes of maize (Z59-17, PSRJ-13041 and Z32-87) (Bodhankar et al, 2017). The isolates could exhibit plant growth promoting traits and improved plant growth under drought stress conditions (Bodhankar et al, 2019). On the basis of 16SrRNA sequence analysis, the isolates MSEB-17, MSEB 72 and MSEB 78 exhibited highest similarity to Bacillus licheniformis, Bacillus subtilis and Bacillus subtilis in the NCBI GenBank database.…”

Section: Maize Seed Endophytic Bacteriamentioning

confidence: 99%

“…Due to their intimate relationship with the host plant, the endophyte can be explored as suitable candidates for development of bioinoculants. Besides plant growth promotion, endophytes have been reported to confer protection to the host plant from biotic and abiotic stresses (Bodhankar et al, 2017;Bodhankar et al, 2019;Coutinho et al, 2015). However, the intricacies of host-endophyte interactions are yet to be unraveled.…”

Section: Introductionmentioning

confidence: 99%

The Expression of Selected Drought Responsive Genes of Maize Is Influenced by Endophytic Bacterial Inoculation

Bodhankar¹,

Grover²,

Manjunath³

et al. 2020

J microb biotech food sci

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Plants respond to abiotic stresses through a series of molecular, cellular and physiological changes. These responses are further influenced by the interactions between host plant and the associated rhizospheric and endophytic microorganisms. The endophytic microorganisms, due to their intimate proximity with the host plant, are considered to have major influence on plant’s physiological responses. In the present study, three drought tolerant and plant growth promoting maize seed endophytic bacteria, Bacillus sp. MSEB 17, Bacillus sp. MSEB 72 and Bacillus sp. MSEB 78 were used as seed inoculants in maize (var Bioseed 9681) under drought stress conditions in a growth chamber pot study and their influence on four drought responsive genes (Zmdhn1, GRMZM2G055844, GRMZM2G467339 and GRMZM2G109448) in maize leaves was studied by real time PCR using specific primers. The influence of inoculation on host plant’s response to drought was evident from altered expression of target genes when compared with uninoculated plants. Notably, inoculation with MSEB 17 increased the expression of three target genes, Zmdhn1 (dehydrin) gene, GRMZM2G467339 gene and GRMZM2G109448 gene by several folds. This study revealed the role of endophytic in alleviating the effect of drought stress in maize plants through regulating plant growth and physiological response.

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“…Additionally, the rice inoculated with B. amyloliquefaciens significantly enhanced growth as well as enhanced levels of some essential antioxidant amino acids such as cysteine, aspartic acid, glutamic acid, phenylalanine and proline under stress conditions. Similarly, Bodhankar et al [ 95 ] studied pre-treatment effects of maize seed with the endophytic strains Corynebacterium hansenii and Bacillus subtilis , which after inoculation improve growth and physiology of maize under drought stress. In addition, pre-treatment with C. hansenii improved relative water content, leaf proline and chlorophyll contents, whereas pre-treatment with B. subtilis enhanced fresh or dry weight of maize over the control plants under drought conditions.…”

Section: Phytohormone Modulation Of Oxidative Stress Tolerancementioning

confidence: 99%

The Potential Application of Endophytes in Management of Stress from Drought and Salinity in Crop Plants

Verma¹,

Kumar

et al. 2021

Microorganisms

120

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Endophytic microorganisms present inside the host plant play an essential role in host fitness, nutrient supply and stress tolerance. Endophytes are often used in sustainable agriculture as biofertilizers, biopesticides and as inoculants to mitigate abiotic stresses including salinity, drought, cold and pH variation in the soil. In changing climatic conditions, abiotic stresses create global challenges to achieve optimum crop yields in agricultural production. Plants experience stress conditions that involve endogenous boosting of their immune system or the overexpression of their defensive redox regulatory systems with increased reactive oxygen species (ROS). However, rising stress factors overwhelm the natural redox protection systems of plants, which leads to massive internal oxidative damage and death. Endophytes are an integral internal partner of hosts and have been shown to mitigate abiotic stresses via modulating local or systemic mechanisms and producing antioxidants to counteract ROS in plants. Advancements in omics and other technologies have been made, but potential application of endophytes remains largely unrealized. In this review article, we will discuss the diversity, population and interaction of endophytes with crop plants as well as potential applications in abiotic stress management.

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In Planta Screening of Maize Seed Endophytic Bacteria for Potential Applications under Dryland Conditions

Cited by 11 publications

References 0 publications

PGPR Mediated Alterations in Root Traits: Way Toward Sustainable Crop Production

PGPR Mediated Alterations in Root Traits: Way Toward Sustainable Crop Production

The Expression of Selected Drought Responsive Genes of Maize Is Influenced by Endophytic Bacterial Inoculation

The Potential Application of Endophytes in Management of Stress from Drought and Salinity in Crop Plants

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