Indução de resistência sistêmica por rizobactérias em cultivos hidropônicos

Bernardes, F. S.; Patrício, Flávia Rodrigues Alves; Santos, Amaury Silva; Freitas, Sueli dos Santos

doi:10.1590/s0100-54052010000200002

Cited by 11 publications

(7 citation statements)

References 24 publications

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“…Our results are also in line with a previous study that reported a positive correlation between the inhibition of mycelial growth of Fusarium oxysporum by fluorescent Pseudomonas with chitinase and protease activity and a negative correlation between the inhibition of the pathogen's mycelial growth and the bacterial production of cellulase [46]. No cellulase activity was also reported for the antagonism of fluorescent Pseudomonas against Pythium aphanidermatum [47].…”

Section: Discussionsupporting

confidence: 93%

Bioprospecting Fluorescent Pseudomonas from the Brazilian Amazon for the Biocontrol of Signal Grass Foliar Blight

et al. 2022

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Biological control is considered the only viable integrated disease management practice for controlling the widely distributed and destructive foliar blight and sudden death disease caused by the fungus Rhizoctonia solani AG-1 IA on signal grass (Urochloa brizantha) pastures. Since major signal grass varieties are highly susceptible and fungicide sprays are not labeled for grass pasture cropping systems, biological control is sought as an alternative for managing this fungal disease. In this study, 24 fluorescent Pseudomonas isolates obtained from naturally suppressive soils from the Amazon biome were bio-prospected for their role as biocontrol agents against R. solani AG-1 IA. Based on in vitro antagonism, three isolates (Amana, Poti, and Yara) were selected for further in vivo assays. Multilocus phylogenetic analysis indicated that Amana and Yara were grouped into the Pseudomonas putida group while Poti was grouped into the Pseudomonas asplenii group, and could well constitute a new Pseudomonas species. For in vivo biocontrol assays, the biocontrol agents were applied either via seed-treatment or via foliar spray. All three isolates produced siderophores and solubilized phosphate, while Amana and Poti showed protease and chitinase in vitro activity. Foliar application of P. putida Amana from Amazonian suppressive soils resulted in a significant reduction of the foliar blight disease severity on signal grass. We discuss further steps for the development and labeling of Pseudomonas-based biofungicides for managing the foliar blight disease on signal grass pastures in Brazil.

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Section: Discussionsupporting

confidence: 93%

Bioprospecting Fluorescent Pseudomonas from the Brazilian Amazon for the Biocontrol of Signal Grass Foliar Blight

et al. 2022

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“…However, for the selection of isolates that have a greater chance of being efficient in the process of colonization and growth promotion, the isolates have first to be identified with preliminary in vitro biochemical analysis (Pal et al [ 2001 ]; Berg et al [ 2002 ]; Bernardes et al [ 2010 ]).Taxonomy of selected microorganisms with biotechnological potential in agriculture is thus a key step and, for this reason, sequencing of the 16S rRNA has been successfully used to identify genera such as Bacillus (Porwal et al In [ 2009 ], Deepa et al [ 2010 ]), Rhizobium, Burkholderia (Ferreira et al [ 2011 ]), Enterobacter, Pantoea Serratia , among others (Tian et al [ 2009 ]).…”

Section: Introductionmentioning

confidence: 99%

Identification and characterization of endophytic bacteria from corn (Zea mays L.) roots with biotechnological potential in agriculture

et al. 2014

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Six endophytic bacteria of corn roots were identified as Bacillus sp. and as Enterobacter sp, by sequencing of the 16S rRNA gene. Four of the strains, CNPSo 2476, CNPSo 2477, CNPSo 2478 and CNPSo 2480 were positive for the nitrogen fixation ability evaluated through the acetylene reduction assay and amplification of nifH gene. Two Bacillus strains (CNPSo 2477 and CNPSo 2478) showed outstanding skills for the production of IAA, siderophores and lytic enzymes, but were not good candidates as growth promoters, because they reduced seed germination. However, the same strains were antagonists against the pathogenic fungi Fusarium verticillioides, Colletotrichum graminicola, Bipolaris maydis and Cercospora zea-maydis. As an indication of favorable bacterial action, Enterobacter sp. CNPSo 2480 and Bacillus sp. CNPSo 2481 increased the root volume by 44% and 39%, respectively, and the seed germination by 47% and 56%, respectively. Therefore, these two strains are good candidates for future testing as biological inoculants for corn.

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“…Eight isolates produced indole substances (data not shown) and among them we selected the isolates IAC‐RBca1, IAC‐RBto1, IAC‐RBag1 and IAC‐RBcr5. In previous studies, these 4 isolates were able to stimulate plant growth in sugarcane, lettuce or chrysanthemum (Bernardes et al, ; Campos, ; Cipriano, ).…”

Section: Methodsmentioning

confidence: 88%

Rhizobacteria improve sugarcane growth and photosynthesis under well‐watered conditions

Rampazzo

Marcos

Cipriano

et al. 2018

Annals of Applied Biology

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Morpho-physiological changes caused by particular plant growth-promoting rhizobacteria were evaluated in sugarcane plants under varying water availability. Under well-watered conditions, we have found one rhizobacteria isolate (IAC-RBcr5) able to enhance root dry matter and photosynthesis of sugarcane plants. The IAC-RBcr5 genome was sequenced and high similarity was found with Pseudomonas putida GB-1. Based on increased root system size of inoculated plants, we hypothesised that sugarcane plants inoculated with IAC-RBcr5 would have improved performance under water deficit. Although IAC-RBcr5 had improved plant leaf CO 2 assimilation under water shortage, inoculation caused reduction of biomass accumulation in sugarcane. The negative influence of water deficit on shoot growth rate and root traits such as volume, area, diameter, length and specific root area was higher in plants treated with IAC-RBcr5 as compared to non-inoculated ones. However, rhizobacteria-induced improvements in leaf and root proline contents would represent a strategy for storing carbon and nitrogen during low water availability and helping both organisms to resume their metabolism after rehydration. In conclusion, we found and identified a rhizobacterium able to improve growth and photosynthesis of sugarcane plants. Such benefit for plant growth was lost under low water availability as a likely consequence of increased carbon-energy demand by rhizobacteria and their sensitivity to drought. (PGPR) form a group of free-living bacteria that promote plant growth by colonising roots of host plants (Saharan & Nehra, 2011). The PGPR may improve plant Ann Appl Biol 172 (2018) 309-320 309

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Indução de resistência sistêmica por rizobactérias em cultivos hidropônicos

Cited by 11 publications

References 24 publications

Bioprospecting Fluorescent Pseudomonas from the Brazilian Amazon for the Biocontrol of Signal Grass Foliar Blight

Bioprospecting Fluorescent Pseudomonas from the Brazilian Amazon for the Biocontrol of Signal Grass Foliar Blight

Identification and characterization of endophytic bacteria from corn (Zea mays L.) roots with biotechnological potential in agriculture

Rhizobacteria improve sugarcane growth and photosynthesis under well‐watered conditions

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