Effect of microbial‐based inoculants on nutrient concentrations and early root morphology of corn (<i>Zea mays</i>)

Calvo, Pilar; Watts, Dexter B.; Kloepper, Joseph W.; Torbert, H. Allen

doi:10.1002/jpln.201500616

Cited by 44 publications

(30 citation statements)

References 70 publications

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“…responses to the soil N conditions. Our results are consistent with previous studies which indicated that PGPR can increase plant height [37] [51] [52], increase plant stem diameter [53] [54], and enhance the number of leaves and leaf area of corn [55] [56]. Most of these improvements in plant growth were observed prior to the corn reaching the tasseling stage.…”

Section: Plant Growth Parameterssupporting

confidence: 92%

“…Therefore, PGPR treatments in our experiment that enhanced plant growth parameters and biomass accumulation could lead to a potential increase in corn yield. In addition, these positive effects of PGPR are mainly attributed to its capacity to promote better absorption of essential nutrients that are responsible for the high rate of photosynthesis [52] [73]. Consistently, a stronger root system, greater SPAD reading and dry weight biomass were observed with PGPR application in our experiment.…”

Section: Biomass Accumulation and N Uptakesupporting

confidence: 86%

“…Root morphological parameters, especially total root length and root surface area, play an important role in the capture of belowground nutrient resources for plant development [62] [63] and root morphological parameters may exhibit higher water retention [64]. Several studies have reported that root structure and morphology are influenced by soil microorganisms such as rhizobacteria [52] [64] [65] [66]. El Zemrany et al [64] investigated the root characteristics of corn where seeds were inoculated with PGPR Azospirillumlipoferum CRT1 during the early growth stages (for 35 days after planting, DAP) and demonstrated that plants inoculated with PGPR significantly increased root biomass, total root length, and root surface area at 26, 30, and 35 DAP.…”

Section: Root Morphologymentioning

confidence: 99%

“…El Zemrany et al [64] investigated the root characteristics of corn where seeds were inoculated with PGPR Azospirillumlipoferum CRT1 during the early growth stages (for 35 days after planting, DAP) and demonstrated that plants inoculated with PGPR significantly increased root biomass, total root length, and root surface area at 26, 30, and 35 DAP. Calvo et al [52] reported that Bacillus spp. mixtures could increase total root length, root surface area, root volume, and total length of fine roots of corn compared to the non-inoculated control when urea ammonium nitrate (UAN) was present at the V2 stage, while positive effects resulted when calcium ammonium nitrate (CAN) was applied at the V4 stage.…”

Section: Root Morphologymentioning

confidence: 99%

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Effect of Plant Growth-Promoting Rhizobacteria at Various Nitrogen Rates on Corn Growth

Lin¹,

Watts²,

Kloepper³

et al. 2019

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Plant growth-promoting rhizobacteria (PGPR) colonize plant roots and promote plant growth by producing and secreting various chemical regulators in the rhizosphere. With the recent interest in sustainable agriculture, an increasing number of researchers are investigating ways to improve the efficiency of PGPR use to reduce chemical fertilizer inputs needed for crop production. Accordingly, greenhouse studies were conducted to evaluate the impact of PGPR inoculants on biomass production and nitrogen (N) content of corn (Zea mays L.) under different N levels. Treatments included three PGPR inoculants (two mixtures of PGPR strains and one control without PGPR) and five N application levels (0%, 25%, 50%, 75%, and 100% of the recommended N rate of 135 kg N ha −1). Results showed that inoculation of PGPR significantly increased plant height, stem diameter, leaf area, and root morphology of corn compared to no PGPR application under the same N levels at the V6 growth stage, but few differences were observed at the V4 stage. PGPR with 50% of the full N rate produced corn biomass and N concentrations equivalent to or greater than that of the full N rate without inoculants at the VT stage. In conclusion, mixtures of PGPR can potentially reduce inorganic N fertilization without affecting corn plant growth parameters. Future research is needed under field conditions to determine if these PGPR inoculants can be integrated as a bio-fertilizer in crop production nutrient management strategies.

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Section: Plant Growth Parameterssupporting

confidence: 92%

Section: Biomass Accumulation and N Uptakesupporting

confidence: 86%

Section: Root Morphologymentioning

confidence: 99%

Section: Root Morphologymentioning

confidence: 99%

See 2 more Smart Citations

Effect of Plant Growth-Promoting Rhizobacteria at Various Nitrogen Rates on Corn Growth

Lin¹,

Watts²,

Kloepper³

et al. 2019

Self Cite

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“…Direct promotion of plant growth occurs when a bacterium facilitates the acquisition of essential nutrients or modulates the level of hormones within a plant. Nutrient acquisition facilitated by plant growth-promoting rhizobacteria (PGPR) usually includes such elements as nitrogen, phosphorus and iron, which are essential for plant development (Calvo et al, 2017). Interestingly, eight isolates of B. subtilis were inoculated in the plants, but only isolate 248 promoted an increase in shoot dry matter.…”

Section: Root and Shoot Dry Mattermentioning

confidence: 99%

Bacillus spp. as plant growth-promoting bacteria in cotton under greenhouse conditions

2019

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The use of plant growth-promoting bacteria (PGPB) is a promising alternative method to improve plant efficiency in the utilization of chemical fertilizers, enabling a reduction of fertilizer application on crops. This study aimed to evaluate the potential of ten Bacillus strains (eight B. subtilis, one B. velezensis and one B. amyloliquefaciens) to promote growth in cotton plants under greenhouse conditions. The experiment was performed in a completely randomized design with 11 treatments and five replicates under greenhouse conditions. The parameters related to plant growth from treatments that received the bacterial isolates were compared to the control. The parameters analyzed were shoot dry matter, root dry matter, total dry matter, plant height, nitrogen content and phosphorus content in soil and in plants. The highest root dry matter was 1.24 g for the isolate 263. The total dry matter was 4.0 g for the isolate 248 and 3.54 g for the isolate 290. The highest chlorophyll content was 28 µg/cm2 for the isolate 290. The higher N content in shoot dry matter was 28 g of N for the isolate 290, 26 g for the isolate 248 and 25 g for the isolate 320. The improved P efficiency use was 32% for the isolate 248, 28% for the isolate 188 and 27% for the isolate 274. These results strongly confirm that B. subtilis isolates 248, 290 and 263 may represent a good alternative as plant growth-promoting endophytes to cotton crops, as they positively affected several parameters evaluated, such as root and shoot dry matter and phosphorus content in the soil. In addition, the parameters evaluated can strongly and positively affect plant yield. However, some isolates of B. subtilis did not promote plant growth and most likely failed as bioinoculants. This result shows the importance of properly identifying the isolate for bioinoculation to achieve success in promoting plant growth.

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Root–microbe Interactions Influencing Water and Nutrient Acquisition Efficiency

Vamerali¹,

Panozzo²,

Visioli³

et al. 2021

The Root Systems in Sustainable Agricultural Intensification

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Effect of microbial‐based inoculants on nutrient concentrations and early root morphology of corn (Zea mays)

Cited by 44 publications

References 70 publications

Effect of Plant Growth-Promoting Rhizobacteria at Various Nitrogen Rates on Corn Growth

Effect of Plant Growth-Promoting Rhizobacteria at Various Nitrogen Rates on Corn Growth

Bacillus spp. as plant growth-promoting bacteria in cotton under greenhouse conditions

Root–microbe Interactions Influencing Water and Nutrient Acquisition Efficiency

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