Bradyrhizobium algeriense sp. nov., a novel species isolated from effective nodules of Retama sphaerocarpa from Northeastern Algeria

Ahnia, Hadjira; Bourebaba, Yasmina; Durán, David; Boulila, Farida; Palacios, José Luis Calvo; Rey, Luís; Ruiz-Argüeso, Tomás; Boulila, Abdelghani; Imperial, Juan

doi:10.1016/j.syapm.2018.03.004

Cited by 34 publications

(17 citation statements)

References 39 publications

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“…Additionally, a tight relationship was also found between the tested isolates and Bradyrhizobium strains nodulating wild genistoid legume shrubs Calicotome spinosa and Spartium junceum growing in the same region (Cardinale et al 2008;Salmi et al 2018). In our plant nodulation tests, the isolates were able to establish effective symbiosis with the native host L. anagyroides as well as C. arborescens and L. polyphyllus, but not with G. max, which was in line with the report by Ahnia et al (2018). The data described indicate that these bacteria are not strictly specialized towards nodulation of specific plant hosts.…”

Section: Discussionsupporting

confidence: 89%

“…The studied strains were confirmed to be closely associated with B. algeriense and B. valentinum, i.e. two species comprising nodule endosymbionts of Genisteae legumes Retama sphaerocarpa and Lupinus mariae-josephae, respectively, which grow solely in the Mediterranean (Durán et al 2014;Ahnia et al 2018). Additionally, a tight relationship was also found between the tested isolates and Bradyrhizobium strains nodulating wild genistoid legume shrubs Calicotome spinosa and Spartium junceum growing in the same region (Cardinale et al 2008;Salmi et al 2018).…”

Section: Discussionmentioning

confidence: 57%

“…The previous studies have shown that the B. jicamae supergroup strains are relatively rare and their geographic range covers mainly hot and arid areas all over the world (e.g. Durán et al 2014;Ahnia et al 2018;Boulila et al 2009). In contrast, the sequences of L. anagyroides endosymbionts from Belgium (De Meyer et al 2011) and Spain (Ruiz-Díez et al 2009) are grouped with 16S rDNA sequences of Bradyrhizobium japonicum supergroup, pointing to their phylogenetic separateness from the bradyrhizobia isolated in Poland (Fig.…”

Section: Discussionmentioning

confidence: 88%

“…representatives of each rep-PCR and ITS-RFLP cluster, did not behave phenotypically as a homogenous group (Table 2). In contrast to strains of B. algeriense RST89 T (Ahnia et al 2018) and B. icense LMTR13 T (Durán et al 2014), all isolates studied had a shorter generation time, grew well at 37°C and 42°C but poorly at 45°C, and utilized sucrose as the sole carbon source (Table 2).…”

Section: Discussionmentioning

confidence: 98%

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Bradyrhizobia associated with Laburnum anagyroides, an exotic legume grown in Poland

Sajnaga

Jach

2020

Symbiosis

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We isolated 18 rhizobial strains from root nodules of a leguminous shrub Laburnum anagyroides (common laburnum) grown in Southeast Poland as an exotic plant. With the use of BOX-PCR fingerprinting, the isolates were clustered into 2 main groups and one separate lineage, which was congruent with the ITS-RFLP results. The phylogenetic trees constructed based on 16S rRNA and combined atpD, dnaK, glnA, and recA gene sequence data separated the representative strains into three evolutionary lineages within the Bradyrhizobium jicamae supergroup, with Bradyrhizobium algeriense and Bradyrhizobium valentinum as the closest relatives. The nodA and nifH gene phylogenies proved that the L. anagyroides symbionts carry a symbiotic gene variant known as Clade IV, representing the symbiovar retamae. Phenotypic characteristics of the isolates and reference strains are also reported. Our study of the rhizobia nodulating L. anagyroides growing in Poland complements earlier few findings on the symbiotic associations of this Genisteae species.

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Section: Discussionsupporting

confidence: 89%

Section: Discussionmentioning

confidence: 57%

Section: Discussionmentioning

confidence: 88%

Section: Discussionmentioning

confidence: 98%

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Bradyrhizobia associated with Laburnum anagyroides, an exotic legume grown in Poland

Sajnaga

Jach

2020

Symbiosis

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“…Retama species are leguminous plants of agronomic interest for biofertilization, dune stabilization, and revegetation of semiarid and arid ecosystems, notably due to their capacity to form symbiosis with N-fixing rhizobial species (Selami et al, 2014). Despite this importance, the symbiotic interaction between Retama and rhizobia species and with nonrhizobial endophytes remains largely understudied (Ahnia et al, 2018;Lamin et al, 2019). Here, we isolated an endophytic bacterium from Retama monosperma root nodules and identified it as a Bacillus megaterium strain by whole genome sequencing.…”

Section: B Megaterium Rmbm31 Induces Transcriptional Changes In Markmentioning

confidence: 99%

Unearthing the Plant Growth-Promoting Traits of Bacillus megaterium RmBm31, an Endophytic Bacterium Isolated From Root Nodules of Retama monosperma

et al. 2020

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Plants live in association with complex populations of microorganisms, including Plant Growth-Promoting Rhizobacteria (PGPR) that confer to plants an improved growth and enhanced stress tolerance. This large and diverse group includes endophytic bacteria that are able to colonize the internal tissues of plants. In the present study, we have isolated a nonrhizobial species from surface sterilized root nodules of Retama monosperma, a perennial leguminous species growing in poor and high salinity soils. Sequencing of its genome reveals this endophytic bacterium is a Bacillus megaterium strain (RmBm31) that possesses a wide range of genomic features linked to plant growth promotion. Furthermore, we show that RmBm31 is able to increase the biomass and positively modify the root architecture of seedlings of the model plant species Arabidopsis thaliana both in physical contact with its roots and via the production of volatile organic compounds. Lastly, we investigated the molecular mechanisms implicated in RmBm31 plant beneficial effects by carrying out a transcriptional analysis on a comprehensive set of phytohormone-responsive marker genes. Altogether, our results demonstrate that RmBm31 displays plant growth-promoting traits of potential interest for agricultural applications.

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Bacteria-Inducing Legume Nodules Involved in the Improvement of Plant Growth, Health and Nutrition

Velázquez

Carro

Flores-Félix

et al. 2019

Microbiome in Plant Health and Disease

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Bacteria-inducing legume nodules are known as rhizobia and belong to the class Alphaproteobacteria and Betaproteobacteria. They promote the growth and nutrition of their respective legume hosts through atmospheric nitrogen fixation which takes place in the nodules induced in their roots or stems. In addition, rhizobia have other plant growth-promoting mechanisms, mainly solubilization of phosphate and production of indoleacetic acid, ACC deaminase and siderophores. Some of these mechanisms have been reported for strains of rhizobia which are also able to promote the growth of several nonlegumes, such as cereals, oilseeds and vegetables. Less studied are the mechanisms that have the rhizobia to promote the plant health; however, these bacteria are able to exert biocontrol of some phytopathogens and to induce the plant resistance. In this chapter, we revised the available data about the ability of the legume noduleinducing bacteria for improving the plant growth, health and nutrition of both legumes and nonlegumes. These data showed that rhizobia meet all the requirements of sustainable agriculture to be used as bio-inoculants allowing the total or partial replacement of chemicals used for fertilization or protection of crops.

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Bradyrhizobium algeriense sp. nov., a novel species isolated from effective nodules of Retama sphaerocarpa from Northeastern Algeria

Cited by 34 publications

References 39 publications

Bradyrhizobia associated with Laburnum anagyroides, an exotic legume grown in Poland

Bradyrhizobia associated with Laburnum anagyroides, an exotic legume grown in Poland

Unearthing the Plant Growth-Promoting Traits of Bacillus megaterium RmBm31, an Endophytic Bacterium Isolated From Root Nodules of Retama monosperma

Bacteria-Inducing Legume Nodules Involved in the Improvement of Plant Growth, Health and Nutrition

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