Bacterial inoculants for enhanced seed germination of Spartina densiflora: Implications for restoration of metal polluted areas

Paredes-Páliz, Karina I.; Pajuelo, Eloísa; Doukkali, Bouchra; Caviedes, Miguel A.; Rodríguez‐Llorente, Ignacio D.; Mateos‐Naranjo, Enrique

doi:10.1016/j.marpolbul.2016.06.036

Cited by 30 publications

(12 citation statements)

References 57 publications

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“…Similar results using diverse Pantoea species have been documented in numerous studies, mainly in those of Panwar et al [50,51], Paredes-Paliz et al [52,53], and Li et al [54]. The genus Pantoea have also been acknowledged as main actors in the shift of seed endophytic community between salt-sensitive and salt-resistant rice cultivars [55].…”

Section: Discussionsupporting

confidence: 84%

Durum Wheat Stress Tolerance Induced by Endophyte Pantoea agglomerans with Genes Contributing to Plant Functions and Secondary Metabolite Arsenal

Cherif‐Silini

Thissera

Bouket

et al. 2019

IJMS

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In the arid region Bou-Saâda at the South of Algeria, durum wheat Triticum durum L. cv Waha production is severely threatened by abiotic stresses, mainly drought and salinity. Plant growth-promoting rhizobacteria (PGPR) hold promising prospects towards sustainable and environmentally-friendly agriculture. Using habitat-adapted symbiosis strategy, the PGPR Pantoea agglomerans strain Pa was recovered from wheat roots sampled in Bou-Saâda, conferred alleviation of salt stress in durum wheat plants and allowed considerable growth in this unhostile environment. Strain Pa showed growth up to 35 °C temperature, 5–10 pH range, and up to 30% polyethylene glycol (PEG), as well as 1 M salt concentration tolerance. Pa strain displayed pertinent plant growth promotion (PGP) features (direct and indirect) such as hormone auxin biosynthesis, production of 1-aminocyclopropane-1-carboxylate (ACC) deaminase, and ammonia and phosphate solubilization. PGPR features were stable over wide salt concentrations (0–400 mM). Pa strain was also able to survive in seeds, in the non-sterile and sterile wheat rhizosphere, and was shown to have an endophytic life style. Phylogenomic analysis of strain Pa indicated that Pantoea genus suffers taxonomic imprecision which blurs species delimitation and may have impacted their practical use as biofertilizers. When applied to plants, strain Pa promoted considerable growth of wheat seedlings, high chlorophyll content, lower accumulation of proline, and favored K+ accumulation in the inoculated plants when compared to Na+ in control non-inoculated plants. Metabolomic profiling of strain Pa under one strain many compounds (OSMAC) conditions revealed a wide diversity of secondary metabolites (SM) with interesting salt stress alleviation and PGP activities. All these findings strongly promote the implementation of Pantoea agglomerans strain Pa as an efficient biofertilizer in wheat plants culture in arid and salinity-impacted regions.

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Section: Discussionsupporting

confidence: 84%

Durum Wheat Stress Tolerance Induced by Endophyte Pantoea agglomerans with Genes Contributing to Plant Functions and Secondary Metabolite Arsenal

Cherif‐Silini

Thissera

Bouket

et al. 2019

IJMS

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“…Classification of P. agglomerans into the biosecurity group 2 and the fact that sometimes this species causes human infections particularly in immunocompromised people prevent its utilization as bioinoculant in Europe ( Dutkiewicz et al, 2016a ; Büyükcam et al, 2018 ). However, increasing evidence has shown that selected members of the P. agglomerans species can have a great potential as plant growth–promoting bacteria ( Paredes-Páliz et al, 2016a , b , 2017 ) and comprise strains that are agronomically relevant for their growth-promoting or biocontrol traits and have been increasingly regarded as ideal candidates among plant growth–promoting rhizobacteria to be used as a biocontrol agent ( Dutkiewicz et al, 2016b ).…”

Section: Introductionmentioning

confidence: 99%

A Genetic and Metabolomic Perspective on the Production of Indole-3-Acetic Acid by Pantoea agglomerans and Use of Their Metabolites as Biostimulants in Plant Nurseries

Luziatelli

Ficca

Bonini³

et al. 2020

Front. Microbiol.

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“…The bacterium was shown to tolerate high levels of arsenic and heavy metals (Zn, Pb, Cu), it shows high salt tolerance and display very good PGPR properties (Paredes-Páliz et al, 2016a), which are listed in Supplementary Table 1. Furthermore, inoculation of Spartina densiflora plants with a bacterial consortium containing RSO7 improved seed germination, enhanced plant growth and ameliorated the physiological state of the host halophyte in metal polluted soils (Paredes-Páliz et al, 2016b.…”

Section: Introductionmentioning

confidence: 99%

Coastal Ecosystems as Sources of Biofertilizers in Agriculture: From Genomics to Application in an Urban Orchard

et al. 2021

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Pantoea agglomerans RSO7, a rhizobacterium previously isolated from Spartina maritima grown on metal polluted saltmarshes, had demonstrated good plant growth promoting activity for its host halophyte, but was never tested in crops. The aims of this study were: (1) testing PGP activity on a model plant (alfalfa) in vitro; (2) testing a bacterial consortium including RSO7 as biofertilizer in a pilot experiment in urban orchard; and (3) identifying the traits related to PGP activities. RSO7 was able to enhance alfalfa growth in vitro, particularly the root system, besides improving plant survival and protecting plants against fungal contamination. In addition, in a pilot experiment in urban orchard, a consortium of three bacteria including RSO7 was able to foster the growth and yield of several winter crops between 1.5 and 10 fold, depending on species. Moreover, the analysis of chlorophyll fluorescence revealed that photosynthesis was highly ameliorated. Genome analysis of RSO7 depicted the robustness of this bacterial strain which showed resilience to multiple stresses (heat, cold, UV radiation, several xenobiotics). Together with wide metabolic versatility, genes conferring resistance to oxidative stress were identified. Many genes involved in metal resistance (As, Cu, Ni, Co, Zn, Se, Te) and in tolerance toward high osmolality (production of a battery of osmoprotectans) were also found. Regarding plant growth promoting properties, traits for phosphate solubilization, synthesis of a battery of siderophores and production of IAA were detected. In addition, the bacterium has genes related to key processes in the rhizosphere including flagellar motility, chemotaxis, quorum sensing, biofilm formation, plant-bacteria dialog, and high competitiveness in the rhizosphere. Our results suggest the high potential of this bacterium as bioinoculant for an array of crops. However, the classification in biosecurity group 2 prevents its use according to current European regulation. Alternative formulations for the application of the bioinoculant are discussed.

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Bacterial inoculants for enhanced seed germination of Spartina densiflora: Implications for restoration of metal polluted areas

Cited by 30 publications

References 57 publications

Durum Wheat Stress Tolerance Induced by Endophyte Pantoea agglomerans with Genes Contributing to Plant Functions and Secondary Metabolite Arsenal

Durum Wheat Stress Tolerance Induced by Endophyte Pantoea agglomerans with Genes Contributing to Plant Functions and Secondary Metabolite Arsenal

A Genetic and Metabolomic Perspective on the Production of Indole-3-Acetic Acid by Pantoea agglomerans and Use of Their Metabolites as Biostimulants in Plant Nurseries

Coastal Ecosystems as Sources of Biofertilizers in Agriculture: From Genomics to Application in an Urban Orchard

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