scholarly journals Diazotrophic Bacteria and their Mechanisms to Interact and Benefit Cereals

2021 ◽  
Author(s):  
Vania Carla Pankievicz ◽  
Fernanda Plucani do Amaral ◽  
Jean-Michael Ane ◽  
Gary Stacey
Keyword(s):  
Nitrogen Fixation ◽  
Plant Growth ◽  
Biological Nitrogen Fixation ◽  
Bacterial Colonization ◽  
Plant Growth Promoting Bacteria ◽  
Diazotrophic Bacteria ◽  
Genetic Determinants ◽  
Plant Growth Promoting ◽  
Stimulate Plant Growth ◽  
Biological Nitrogen

Plant growth-promoting bacteria (PGPB) stimulate plant growth through diverse mechanisms. Besides biological nitrogen fixation, diazotrophic PGPB can improve nutrient uptake efficiency from the soil, produce and release phytohormones to the host, and confer resistance against pathogens. The genetic determinants that drive the success of biological nitrogen fixation in non-legume plants are understudied. These determinants include recognition and signaling pathways, bacterial colonization, and genotype specificity between host and bacteria. This review presents recent discoveries of how nitrogen-fixing PGPB interacts with cereals and promotes plant growth. We suggest adopting an experimental model system, such as the Setaria-diazotrophic bacteria association, as a reliable way to better understand the associated mechanisms and, ultimately, increase the use of PGPB inoculants for sustainable agriculture.

scholarly journals Role of Diazotrophic Bacteria in Biological Nitrogen Fixation and Plant Growth Improvement

2016 ◽  
Vol 49 (1) ◽  
pp. 17-29 ◽  
Author(s):  
Wansik Shin ◽  
Rashedul Islam ◽  
Abitha Benson ◽  
Manoharan Melvin Joe ◽  
Kiyoon Kim ◽  
...  
Keyword(s):  
Nitrogen Fixation ◽  
Plant Growth ◽  
Biological Nitrogen Fixation ◽  
Diazotrophic Bacteria ◽  
Biological Nitrogen

scholarly journals Bradyrhizobium as the Only Rhizobial Inhabitant of Mung Bean (Vigna radiata) Nodules in Tropical Soils: A Strategy Based on Microbiome for Improving Biological Nitrogen Fixation Using Bio-Products

2021 ◽  
Vol 11 ◽  
Author(s):  
Vinício Oliosi Favero ◽  
Rita Hilário Carvalho ◽  
Victória Monteiro Motta ◽  
Ana Beatriz Carneiro Leite ◽  
Marcia Reed Rodrigues Coelho ◽  
...  
Keyword(s):  
Nitrogen Fixation ◽  
Plant Growth ◽  
Grain Yield ◽  
Bacterial Diversity ◽  
Biological Nitrogen Fixation ◽  
Mung Bean ◽  
Soil Microbial Communities ◽  
Tropical Soils ◽  
Soil Samples ◽  
Biological Nitrogen

The mung bean has a great potential under tropical conditions given its high content of grain protein. Additionally, its ability to benefit from biological nitrogen fixation (BNF) through association with native rhizobia inhabiting nodule microbiome provides most of the nitrogen independence on fertilizers. Soil microbial communities which are influenced by biogeographical factors and soil properties, represent a source of rhizobacteria capable of stimulating plant growth. The objective of this study is to support selection of beneficial bacteria that form positive interactions with mung bean plants cultivated in tropical soils, as part of a seed inoculation program for increasing grain yield based on the BNF and other mechanisms. Two mung bean genotypes (Camaleão and Esmeralda) were cultivated in 10 soil samples. Nodule microbiome was characterized by next-generation sequencing using Illumina MiSeq 16S rRNA. More than 99% of nodule sequences showed similarity with Bradyrhizobium genus, the only rhizobial present in nodules in our study. Higher bacterial diversity of soil samples collected in agribusiness areas (MW_MT-I, II or III) was associated with Esmeralda genotype, while an organic agroecosystem soil sample (SE_RJ-V) showed the highest bacterial diversity independent of genotype. Furthermore, OTUs close to Bradyrhizobium elkanii have dominated in all soil samples, except in the sample from the organic agroecosystem, where just B. japonicum was present. Bacterial community of mung bean nodules is mainly influenced by soil pH, K, Ca, and P. Besides a difference on nodule colonization by OTU sequences close to the Pseudomonas genus regarding the two genotypes was detected too. Although representing a small rate, around 0.1% of the total, Pseudomonas OTUs were only retrieved from nodules of Esmeralda genotype, suggesting a different trait regarding specificity between macro- and micro-symbionts. The microbiome analysis will guide the next steps in the development of an inoculant for mung bean aiming to promote plant growth and grain yield, composed either by an efficient Bradyrhizobium strain on its own or co-inoculated with a Pseudomonas strain. Considering the results achieved, the assessment of microbial ecology parameters is a potent coadjuvant capable to accelerate the inoculant development process and to improve the benefits to the crop by soil microorganisms.

scholarly journals Humic Substances in Combination With Plant Growth-Promoting Bacteria as an Alternative for Sustainable Agriculture

2021 ◽  
Vol 12 ◽  
Author(s):  
Maura Santos Reis de Andrade da Silva ◽  
Bianca de Melo Silveira dos Santos ◽  
Camilla Santos Reis de Andrade da Silva ◽  
Carolina Santos Reis de Andrade da Silva ◽  
Luiz Fernando de Sousa Antunes ◽  
...  
Keyword(s):  
Plant Growth ◽  
Humic Substances ◽  
Bacterial Colonization ◽  
Simultaneous Action ◽  
Mineral Fertilizers ◽  
Plant Responses ◽  
Plant Growth Promoting Bacteria ◽  
Plant Growth Promoting ◽  
Growth Promoting

Plant growth-promoting bacteria (PGPB) and humic substances (HSs) are promising options for reducing the use of pesticides and mineral fertilizers. Although many studies have shown the effects of PGPB and HSs separately, little information is available on plant responses to the combined application of these biostimulants despite the great potential for the simultaneous action of these biological inputs. Thus, the objective of this review is to present an overview of scientific studies that addressed the application of PGPB and HSs to different crops. First, we discuss the effect of these biostimulants on biological nitrogen fixation, the various effects of the inoculation of beneficial bacteria combined with the application of HSs on promoting the growth of nonleguminous plants and how this combination can increase bacterial colonization of plant hosts. We also address the effect of PGPB and HSs on plant responses to abiotic stresses, in addition to discussing the role of HSs in protecting plants against pathogens. There is a lack of studies that address the role of PGPB + HSs in biocontrol. Understanding the factors involved in the promotion of plant growth through the application of PGPB and HSs can assist in the development of efficient biostimulants for agricultural management. This approach has the potential to accelerate the transition from conventional cultivation to sustainable agrosystems.

scholarly journals Isolation, Characterization and Selection of Bacteria that Promote Plant Growth in Grapevines (Vitis sp.)

2016 ◽  
Vol 9 (1) ◽  
pp. 184 ◽  
Author(s):  
Gislaine Aparecida Denardi Biasolo ◽  
Daniel Antonio Kucmanski ◽  
Sabrina Pinto Salamoni ◽  
João Peterson Pereira Gardin ◽  
Elisandra Minotto ◽  
...  
Keyword(s):  
Nitrogen Fixation ◽  
Plant Growth ◽  
Research Effort ◽  
Branch Length ◽  
Dry Mass ◽  
Bacterial Suspension ◽  
Control Group ◽  
Plant Growth Promoting Bacteria ◽  
Plant Growth Promoting

<p>Certain bacteria can promote and stimulate plant growth, increasing the production of biomass and reducing damage caused by phytopathogens. With that in mind, this research effort set out to select these plant growth-promoting bacteria in order to evaluate their effects on the growth of grapevines (<em>Vitis</em> sp.). The bacteria were isolated from several vineyard soil samples, and evaluated based on their production of IAA (Indole-3-Acetic Acid), siderophores and cellulase, as well as their phosphate solubilization and nitrogen fixation capabilities. <em>In vivo</em> testing included six separate treatments with the following bacterial isolates: C12, O7, B3, I3, a control group and a blended group. The tests were performed in a greenhouse with bacterial suspension inoculation placed around the roots of Paulsen 1103 rootstock cuttings. The data collected included the following: number of leaves per plant, branch lengths, chlorophyll content, fresh and dry mass, and Carbon, Hydrogen, Nitrogen and Sulfur concentrations. Forty-six separate bacteria were isolated, of which 100% produced IAA, 65.21% produced siderophores, 63.04% solubilized phosphate, 34.78% produced cellulase, and 30.43% showed nitrogen fixation. The <em>in vivo</em> testing also revealed significant increases in the length of the branch and in percentages of Carbon and Nitrogen. The C12 isolate exhibited the highest increase in branch length (76.704 cm), whereas the O7 and C12 were identified as <em>Bacillus amyloliquefaciens</em> and <em>Bacillus thuringiensis</em>, respectively<em>.</em></p>

scholarly journals Sugarcane inoculated with endophytic diazotrophic bacteria: effects on yield, biological nitrogen fixation and industrial characteristics

2019 ◽  
Vol 91 (4) ◽  
Author(s):  
JADSON EMANUEL L. ANTUNES ◽  
ANA DOLORES S. DE FREITAS ◽  
LOUISE M.S. OLIVEIRA ◽  
MARIA DO CARMO C.P. DE LYRA ◽  
MANOEL A.C. FONSECA ◽  
...  
Keyword(s):  
Nitrogen Fixation ◽  
Biological Nitrogen Fixation ◽  
Diazotrophic Bacteria ◽  
Endophytic Diazotrophic Bacteria ◽  
Biological Nitrogen

scholarly journals Biological nitrogen fixation by diazotrophic bacteria in association with grasses of economic importance

2014 ◽  
Vol 8 (31) ◽  
pp. 2898-2903 ◽  
Author(s):  
de Oliveira Arajo Erica ◽  
Carlos Tadeu Vitorino Antonio ◽  
Martins Mercante Fbio ◽  
Lopes Olivares Fbio
Keyword(s):  
Nitrogen Fixation ◽  
Biological Nitrogen Fixation ◽  
Economic Importance ◽  
Diazotrophic Bacteria ◽  
Biological Nitrogen
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