Long-term silicate fertilization increases the abundance of Actinobacterial population in paddy soils

Samaddar, Sandipan; Truu, Jaak; Chatterjee, Poulami; Truu, Marika; Kim, Kiyoon; Kim, Sukjin; Sundaram, Shanthy; Sa, Tongmin

doi:10.1007/s00374-018-01335-6

Cited by 39 publications

(20 citation statements)

References 72 publications

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“…Exogenous application of K-silicate has a positive role in enhancing plant growth, root length, and architecture [ 28 , 35 ], which mitigates the deleterious effect of salinity in the faba bean rhizosphere leading to increasing microbial biomass, which indirectly reflecting on prompting the synthesis of soil enzymes. Moreover, K-silicate could stimulate the availability of soil nutrients, such as N, which has a direct positive relationship with the activities of soil enzymes [ 36 , 37 ]. The direct application of PGPR to the soil or in the inoculated seeds greatly increases microbial biomass and community diversity, which influenced the soil enzymes [ 38 ].…”

Section: Discussionmentioning

confidence: 99%

Foliar-Applied Potassium Silicate Coupled with Plant Growth-Promoting Rhizobacteria Improves Growth, Physiology, Nutrient Uptake and Productivity of Faba Bean (Vicia faba L.) Irrigated with Saline Water in Salt-Affected Soil

Hafez

Osman

El-Razek

et al. 2021

Plants

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The continuity of traditional planting systems in the last few decades has encountered its most significant challenge in the harsh changes in the global climate, leading to frustration in the plant growth and productivity, especially in the arid and semi-arid regions cultivated with moderate or sensitive crops to abiotic stresses. Faba bean, like most legume crops, is considered a moderately sensitive crop to saline soil and/or saline water. In this connection, a field experiment was conducted during the successive winter seasons 2018/2019 and 2019/2020 in a salt-affected soil to explore the combined effects of plant growth-promoting rhizobacteria (PGPR) and potassium (K) silicate on maintaining the soil quality, performance, and productivity of faba bean plants irrigated with either fresh water or saline water. Our findings indicated that the coupled use of PGPR and K silicate under the saline water irrigation treatment had the capability to reduce the levels of exchangeable sodium percentage (ESP) in the soil and to promote the activity of some soil enzymes (urease and dehydrogenase), which recorded nearly non-significant differences compared with fresh water (control) treatment, leading to reinstating the soil quality. Consequently, under salinity stress, the combined application motivated the faba bean vegetative growth, e.g., root length and nodulation, which reinstated the K+/Na+ ions homeostasis, leading to the lessening or equalizing of the activity level of enzymatic antioxidants (CAT, POD, and SOD) compared with the controls of both saline water and fresh water treatments, respectively. Although the irrigation with saline water significantly increased the osmolytes concentration (free amino acids and proline) in faba bean plants compared with fresh water treatment, application of PGPR or K-silicate notably reduced the osmolyte levels below the control treatment, either under stress or non-stress conditions. On the contrary, the concentrations of soluble assimilates (total soluble proteins and total soluble sugars) recorded pronounced increases under tested treatments, which enriched the plant growth, the nutrients (N, P, and K) uptake and translocation to the sink organs, which lastly improved the yield attributes (number of pods plant−1, number of seeds pod−1, 100-seed weight). It was concluded that the combined application of PGPR and K-silicate is considered a profitable strategy that is able to alleviate the harmful impact of salt stress alongside increasing plant growth and productivity.

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Section: Discussionmentioning

confidence: 99%

Foliar-Applied Potassium Silicate Coupled with Plant Growth-Promoting Rhizobacteria Improves Growth, Physiology, Nutrient Uptake and Productivity of Faba Bean (Vicia faba L.) Irrigated with Saline Water in Salt-Affected Soil

Hafez

Osman

El-Razek

et al. 2021

Plants

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“…Soil Si has many fractions, including available Si, organic matter adsorbed Si (OM Si), Fe/Mn-oxide-combined Si (Fe-Mn Si), and amorphous Si (ASi), which exhibit a dynamic balance between different Si fractions that regulate available Si in the soil (Cornelis et al, 2011;Georgiadis et al, 2013;Baráo et al, 2014;Cornelis and Delvaux, 2016;Li et al, 2020;Yang et al, 2020a). Changes in soil available Si are influenced by many management practices, such as slag fertilization, Si fertilization, and returning of straw (Ning et al, 2014;Liang et al, 2015;Samaddar et al, 2019;Li et al, 2020). In recent years, the risk for bioavailable Si deficiency has become obvious with the promotion of high-yield varieties and increase in multiple cropping index (Liang et al, 2015;Marxen et al, 2016;.…”

Section: Introductionmentioning

confidence: 99%

Soil bacterial communities interact with silicon fraction transformation and promote rice yield after long-term straw return

Song

Liao

et al. 2021

Soil Ecol. Lett.

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Returning crop straw into the soil is an important practice to balance biogenic and bioavailable silicon (Si) pool in paddy, which is crucial for the healthy growth of rice. However, owing to little knowledge about soil microbial communities responsible for straw degradation, how straw return affects Si bioavailability, its uptake, and rice yield remains elusive. Herein, we investigate the change of soil Si fractions and microbial community in a 39-year-old paddy field amended by a long-term straw return. Results show that rice straw return significantly increased soil bioavailable Si and rice yield from 29.9% to 61.6% and from 14.5% to 23.6%, respectively, when compared to NPK fertilization alone. Straw return significantly altered soil microbial community abundance. Acidobacteria was positively and significantly related to amorphous Si, while Rokubacteria at phylum level, Deltaproteobacteria, and Holophagae at class level was negatively and significantly related to organic matter adsorbed and Fe/Mn-oxide-combined Si in soils. Redundancy analysis of their correlations further demonstrated that Si status significantly explained 12% of soil bacterial community variation. These findings suggest that soil bacteria community and diversity interact with Si mobility by altering its transformation, thus resulting in the balance of various nutrient sources to drive biological Si cycle in agroecosystem.

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“…For determining the NO 3 ‐N contents, 5 g of soil sample was extracted with 50 mL of 0.025 M Al 2 (SO 4 ) 3 and the NO 3 ‐N contents measured by the ion selective electrode method using nitrate and a reference electrode. Available P was determined using the Lancaster method as reported by Samaddar et al (2019).…”

Section: Methodsmentioning

confidence: 99%

Long‐term inorganic nitrogen application changes the ammonia‐oxidizing archaeal community composition in paddy soils

Samaddar

Truu

Chatterjee

et al. 2021

European J Soil Science

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The abundance and taxonomic composition of ammonia‐oxidizing archaea (AOA) were assessed in paddy soils that had received more than 50 years of fertilization with and without inorganic N. The inorganic N fertilized treatments were: NPK and NPK + CO (nitrogen (N), phosphorus (P), potassium (K) and compost (CO)). The treatments without inorganic N were: CO, PK and control (unfertilized soils). Quantitative PCR (qPCR) analysis of the archaeal amoA gene showed no significant changes in AOA abundance following the long‐term application of inorganic N fertilizers. However, subsequent analysis of amoA gene sequencing data showed that inorganic N application significantly changed the AOA community composition and alpha diversity indices. Edge principal components analysis (PCA) showed varying contributions of distinct AOA lineages in separating samples according to the fertilization treatment. Addition of inorganic N favoured an increase in the abundance of AOA lineages belonging to Nitrososphaera, and the treatments without inorganic N additions formed a separate cluster dominated by Nitrosotalea lineage. The distinct response of the two AOA lineages points towards different community organization of soil AOA and strongly supports the concept of habitat partitioning in paddy soil ecosystems. Highlights Lineages of AOA responded differently to different N management practices. Long‐term N fertilization selectively enriched AOA lineages, with C:N ratio a factor associated with such changes Inorganic N favoured Nitrososphaera lineage abundance Regardless of fertilizer status, Nitrosotalea lineage was dominant in the absence of inorganic N fertilization.

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Long-term silicate fertilization increases the abundance of Actinobacterial population in paddy soils

Cited by 39 publications

References 72 publications

Foliar-Applied Potassium Silicate Coupled with Plant Growth-Promoting Rhizobacteria Improves Growth, Physiology, Nutrient Uptake and Productivity of Faba Bean (Vicia faba L.) Irrigated with Saline Water in Salt-Affected Soil

Foliar-Applied Potassium Silicate Coupled with Plant Growth-Promoting Rhizobacteria Improves Growth, Physiology, Nutrient Uptake and Productivity of Faba Bean (Vicia faba L.) Irrigated with Saline Water in Salt-Affected Soil

Soil bacterial communities interact with silicon fraction transformation and promote rice yield after long-term straw return

Long‐term inorganic nitrogen application changes the ammonia‐oxidizing archaeal community composition in paddy soils

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