Elucidating the Rhizosphere Associated Bacteria for Environmental Sustainability

Nwachukwu, Blessing Chidinma; Babalola, Olubukola Oluranti

doi:10.3390/agriculture11010075

Cited by 35 publications

(17 citation statements)

References 112 publications

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“…Amino acids in root exudates besides sugars tailor communities because they represent carbon and nitrogen substrates for microbial growth (Pongrac et al, 2020). Higher release of these exudates contributes to increase in bacterial persistence in the root rhizosphere (Nwachukwu et al, 2021). In return, bacteria can benefit plants by enhanced the nutrient absorbing capability of roots especially to facilitate phosphorus uptake (Grover et al, 2021).…”

Section: Discussionmentioning

confidence: 99%

Differential Root Exudation and Architecture for Improved Growth of Wheat Mediated by Phosphate Solubilizing Bacteria

et al. 2021

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Phosphorous (P) deficiency is a major challenge faced by global agriculture. Phosphate-solubilizing bacteria (PSB) provide a sustainable approach to supply available phosphates to plants with improved crop productivity through synergistic interaction with plant roots. The present study demonstrates an insight into this synergistic P-solubilizing mechanism of PSB isolated from rhizosphere soils of major wheat-growing agro-ecological zones of Pakistan. Seven isolates were the efficient P solubilizers based on in vitro P-solubilizing activity (233-365 μg ml–1) with a concomitant decrease in pH (up to 3.5) by the production of organic acids, predominantly acetic acid (∼182 μg ml–1) and gluconic acid (∼117 μg ml–1). Amplification and phylogenetic analysis of gcd, pqqE, and phy genes of Enterobacter sp. ZW32, Ochrobactrum sp. SSR, and Pantoea sp. S1 showed the potential of these PSB to release orthophosphate from recalcitrant forms of phosphorus. Principal component analysis indicates the inoculation response of PSB consortia on the differential composition of root exudation (amino acids, sugars, and organic acids) with subsequently modified root architecture of three wheat varieties grown hydroponically. Rhizoscanning showed a significant increase in root parameters, i.e., root tips, diameter, and surface area of PSB-inoculated plants as compared to uninoculated controls. Efficiency of PSB consortia was validated by significant increase in plant P and oxidative stress management under P-deficient conditions. Reactive oxygen species (ROS)-induced oxidative damages mainly indicated by elevated levels of malondialdehyde (MDA) and H2O2 contents were significantly reduced in inoculated plants by the production of antioxidant enzymes, i.e., superoxide dismutase, catalase, and peroxidase. Furthermore, the inoculation response of these PSB on respective wheat varieties grown in native soils under greenhouse conditions was positively correlated with improved plant growth and soil P contents. Additionally, grain yield (8%) and seed P (14%) were significantly increased in inoculated wheat plants with 20% reduced application of diammonium phosphate (DAP) fertilizer under net house conditions. Thus, PSB capable of such synergistic strategies can confer P biofortification in wheat by modulating root morphophysiology and root exudation and can alleviate oxidative stress under P deficit conditions.

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Section: Discussionmentioning

confidence: 99%

Differential Root Exudation and Architecture for Improved Growth of Wheat Mediated by Phosphate Solubilizing Bacteria

et al. 2021

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“…Moreover, they release organic exudates that act as aggregating agents. The exudates in the rhizosphere favor the development of the soil microbiota, producing polysaccharides that also act in soil aggregation [24].…”

Section: Resultsmentioning

confidence: 99%

Corn Yield in Monoculture and Intercropped with Cover Plants and Aggregates Stability

Seidel

Mendes

Stein

2022

EJFOOD

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The cultivation of corn intercropped with cover crops has been increasing in the western region of Paraná. However, more technical information about this type of cultivation is needed. Thus, the present study aims to evaluate the yield of corn intercropped with brachiaria and crotalaria and its effect on aggregate stability and soil consistency. The experiment was carried out at the experimental station of Cooperativa Agrícola Mista Rondon (Copagril), in the city of Marechal Cândido Rondon. The experimental design was randomized blocks with 8 replications. There were six treatments for corn cultivation (T1) Corn monoculture (control), (T2) Corn intercropped with Brachiaria (Brachiaria ruzizienses), (T3) Brachiaria in monoculture, (T4) Crotalaria spectabilis (Crotalaria spectabilis) in monoculture, (T5) Corn intercropped with Crotalaria, (T6) Black oats (Avena sativum) in monoculture. Corn yield in intercropping, dry matter added to the soil, aggregate stability and soil consistency were evaluated. The yield of corn intercropped with cover crops was similar to that of corn in monoculture. The cultivation of Brachiaria ruziziensis in monoculture or intercropped with corn produced a large amount of straw and favored soil aggregation. Therefore, the intercropping systems are recommended for the improvement of soil physical properties and the conservation of soil.

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“…The rhizosphere, a narrow zone of soil near plant roots, is an important place for plants to exchange materials and energy with the environment. Rhizobacteria directly or indirectly benefit plants by producing beneficial chemicals that provide nutrition to plants, increase antioxidant capacity, enhance stress resistance and suppress pathogens (Nwachukwu et al, 2021; Sapre et al, 2021). The rhizosphere bacterial community is affected by several factors from the environment.…”

Section: Discussionmentioning

confidence: 99%

Elucidating the interaction of rhizosphere bacteria and environmental factors in influencing active ingredient content of Lycium barbarum fruit in China

Liu

Wang

Lei

et al. 2022

Journal of Applied Microbiology

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Aims This study aimed to compare the differences in the bacterial community structure of Lycium barbarum rhizosphere and elucidate the contribution of rhizosphere bacteria to the active ingredients of L. barbarum fruit. Methods and Results This study investigated the soil and meteorological characteristics of L. barbarum rhizosphere during three growth stages across three production regions of China. High‐throughput sequencing showed significant differences in the bacterial community diversity of L. barbarum rhizosphere across the three production regions, and norank_o_Gaiellales, norank_f_Anaerolineaceae and norank_f_AKYG1722 were the highest in Ningxia. In addition, regression and path analysis revealed that pH, norank_o_Gaiellales and norank_f_AKYG1722 significantly promoted the accumulation of total sugar and flavonoids in L. barbarum fruit directly or indirectly. Soil organic matter (SOM), norank_f_Anaerolineaceae and humidity significantly promoted the accumulation of betaine. The average temperature during the growth stages, norank_f_AKYG1722, and norank_o_Gaiellales promoted the accumulation of polysaccharides. Conclusions The interaction between rhizosphere bacteria and environmental factors promoted the accumulation of active ingredients in L. barbarum fruits. Significance and Impact of the Study Our results provided insights to improve the quality of L. barbarum fruit.

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Elucidating the Rhizosphere Associated Bacteria for Environmental Sustainability

Cited by 35 publications

References 112 publications

Differential Root Exudation and Architecture for Improved Growth of Wheat Mediated by Phosphate Solubilizing Bacteria

Differential Root Exudation and Architecture for Improved Growth of Wheat Mediated by Phosphate Solubilizing Bacteria

Corn Yield in Monoculture and Intercropped with Cover Plants and Aggregates Stability

Elucidating the interaction of rhizosphere bacteria and environmental factors in influencing active ingredient content of Lycium barbarum fruit in China

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