Biofertilization with Macrocystis pyrifera algae extracts combined with PGPR-enhanced growth in Lactuca sativa seedlings

Iparraguirre, Julia; Masciarelli, Oscar; Llanes, Analía; Guilherme, J. Zocolo; Luna, Virginia

doi:10.1007/s10811-020-02202-4

Cited by 23 publications

(11 citation statements)

References 45 publications

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“…Lettuce (Lactuca sativa L.) is sensitive to abiotic stress [89]; its shallow root system makes it sensitive to water deficit, which increases with plant growth [90]. Julia et al [91] applied a biofertilizer of Macrocystis pyrifera algal extracts and the PGPR Azospirillum brasilense, which increased germination rate and lettuce growth in saline conditions. In another study, PGPR-inoculated lettuce had a higher phenolic and flavonoid content than uninoculated plants under greenhouse conditions [92].…”

Section: Role Of Pgpr In Vegetable Crop Productionmentioning

confidence: 99%

Plant-Growth-Promoting Rhizobacteria Emerging as an Effective Bioinoculant to Improve the Growth, Production, and Stress Tolerance of Vegetable Crops

Kumar

Giri

Pandey

et al. 2021

IJMS

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Vegetable cultivation is a promising economic activity, and vegetable consumption is important for human health due to the high nutritional content of vegetables. Vegetables are rich in vitamins, minerals, dietary fiber, and several phytochemical compounds. However, the production of vegetables is insufficient to meet the demand of the ever-increasing population. Plant-growth-promoting rhizobacteria (PGPR) facilitate the growth and production of vegetable crops by acquiring nutrients, producing phytohormones, and protecting them from various detrimental effects. In this review, we highlight well-developed and cutting-edge findings focusing on the role of a PGPR-based bioinoculant formulation in enhancing vegetable crop production. We also discuss the role of PGPR in promoting vegetable crop growth and resisting the adverse effects arising from various abiotic (drought, salinity, heat, heavy metals) and biotic (fungi, bacteria, nematodes, and insect pests) stresses.

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Section: Role Of Pgpr In Vegetable Crop Productionmentioning

confidence: 99%

Plant-Growth-Promoting Rhizobacteria Emerging as an Effective Bioinoculant to Improve the Growth, Production, and Stress Tolerance of Vegetable Crops

Kumar

Giri

Pandey

et al. 2021

IJMS

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“…The degree of soil acidification is known to affect the bacterial community and composition of beneficial microbes such as rhizosphere bacteria implicated in plant growth promotion and other biogeochemical mechanisms. For instance, plant growth-promoting rhizobacteria (PGPR) inhabit plant rhizosphere symbiotically exerting a positive effect on plant growth and productivity. , In addition, they also contribute to nitrogen fixation and the production of phytohormones and other compounds that enhance soil structure, nutrient uptake, and protection from pathogens . Genera of rhizobacteria such as Acetobacter , Azospirillum , Bacillus , Burkholderia , and Pseudomonas are implicated in enhancing plant growth. ,, In the present study, bacterial genera like Acetobacter , Azospirillum , and Bradyrhizobium that belong to α- Proteobacteria occurred significantly in algalized treatments of both the acid soils, and Nitrobacter was observed only in soil A.…”

Section: Discussionmentioning

confidence: 77%

“…17,56 In addition, they also contribute to nitrogen fixation and the production of phytohormones and other compounds that enhance soil structure, nutrient uptake, and protection from pathogens. 57 Genera of rhizobacteria such as Acetobacter, Azospirillum, Bacillus, Burkholderia, and Pseudomonas are implicated in enhancing plant growth. 42,58,59 In the present study, bacterial genera like Acetobacter, Azospirillum, and Bradyrhizobium that belong to α-Proteobacteria occurred significantly in algalized treatments of both the acid soils, and Nitrobacter was observed only in soil A.…”

Section: ■ Discussionmentioning

confidence: 99%

Algalization of Acid Soils with Desmodesmus sp. MAS1 and Heterochlorella sp. MAS3 Enriches Bacteria of Ecological Importance

Abinandan

Shanthakumar

Panneerselvan

et al. 2022

ACS Agric. Sci. Technol.

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Acid soils are the degraded (nutrient-poor) soils that generally lack microbial abundance required to promote plant growth. An insight into the microbial diversity in highly acidic soils is crucial from both ecological and environmental standpoints. Previously, we showed that inoculation of acid soils with acid-tolerant microalgae (algalization) significantly improved soil physicochemical and biological characteristics. In the present novel study involving a laboratory microcosm, high-throughput 16S rRNA amplicon sequencing analysis was performed to investigate the bacterial diversity in acid soils algalized with Desmodesmus sp. MAS1 and Heterochlorella sp. MAS3 after 90 days of incubation. Our results on pooled DNA demonstrate that algalization of two acid soils (soil A and B) significantly increased several bacterial genera, and this observation is consistent with Shannon and Chao1 diversity indices. Actinobacteria, Acidobacteria, Firmicutes, and Proteobacteria were the most prevalent phyla enriched in all of the algalized treatments. Interestingly, nonalgalized acid soils favored only Firmicutes and Actinobacteria, but algalization significantly enriched Proteobacteria, Acidobacteria, and Actinobacteria. Canonical correspondence analysis revealed a positive effect of pH in soil A and both pH and organic carbon in soil B on enrichment. Furthermore, soil bacteria of ecological significance that belong to rhizobacteria and diazotrophs, such as Acetobacter, Azospirillum, Bradyrhizobium, Gluconacetobacter, Nitrobacter, Burkholderia, Comamonas, Herbaspirillum, Enterobacter, Nitrosococcus, Brevibacillus, Enterococcus, Frankia, and Anabaena, were greatly enriched in algalized treatments. Thus, we demonstrate here for the first time that algalization of acid soils significantly improves soil health through enrichment of bacteria that are largely implicated in promoting soil health and plant growth.

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“…Rhizobium leguminosarum was previously used as a potential microbial biofertilizer for L. sativa [ 62 ]. Rhizobium radiobacter was described as the best biofertilizer for lettuce cultivation compared with (NPK), vermicompost (VC), and farmyard manure (FYM) [ 63 ]. Additionally, different Pseudomonas strains alleviated salt stress in lettuce plants [ 64 ].…”

Section: Discussionmentioning

confidence: 99%

Brevibacillus DesertYSK and Rhizobium MAP7 stimulate the growth and pigmentation of Lactuca sativa L.

Mowafy

Khalifa

Elsayed

2023

Journal of Genetic Engineering and Biotechnology

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Background Applying microbial biostimulants during crop cultivation allows for higher sustainability levels. It reduces the need for fertilizers and environmental contaminants while enhancing plant quality. This study assessed 13 endophytic bacteria, 4 newly isolated, and 9 donated, for plant growth-promoting capabilities. Quantitative assessments of indole acetic acid (IAA), gibberellic acid (GA3), siderophores, ammonia, exopolysaccharides, volatile HCN, and phosphate solubilization, along with Bray–Curtis cluster analyses were performed. Results Upon the results we selected RhizobiumMAP7, Brevibacillus DesertYSK, Pseudomonas MAP8, BacillusMAP3, Brevibacillus MAP, and Bacillus DeltaYSK to evaluate their effects on Lactuca sativa growth and pigmentation in a 30-day greenhouse pot experiment. Both Brevibacillus DesertYSK and Rhizobium MAP7surpassed other strains in growth promotional effects. They doubled shoot length (12 and 12.3 cm, respectively, when compared with 7 cm for control after 30 days), and fresh weight (0.079 and 0.084 g, respectively, when compared with 0.045 g for control after 30 days), and increased root length by at least 3-fold when compared with control (4.5 and 3.5 cm, respectively, when compared with 1.2 cm for control after 30 days). Chlorophyll content also exhibited at least a 2-fold significant increase in response to bacterization compared with control. Conclusions This strain superiority was consistent with the in vitro assays data that showed strains capability as IAA and GA3producers. Also, strains were highly capable ammonia and siderophore producers and phosphate solubilizers, providing considerable hormone and nutrient levels for L. sativa plantsleading to improved growth parameters and appearance. These data support the notion that nodule-based bacteria are potential plant growth-promoting bacteria (PGPB) that may be used on a wider scale rather than just for legumes.

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Biofertilization with Macrocystis pyrifera algae extracts combined with PGPR-enhanced growth in Lactuca sativa seedlings

Cited by 23 publications

References 45 publications

Plant-Growth-Promoting Rhizobacteria Emerging as an Effective Bioinoculant to Improve the Growth, Production, and Stress Tolerance of Vegetable Crops

Plant-Growth-Promoting Rhizobacteria Emerging as an Effective Bioinoculant to Improve the Growth, Production, and Stress Tolerance of Vegetable Crops

Algalization of Acid Soils with Desmodesmus sp. MAS1 and Heterochlorella sp. MAS3 Enriches Bacteria of Ecological Importance

Brevibacillus DesertYSK and Rhizobium MAP7 stimulate the growth and pigmentation of Lactuca sativa L.

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