Modulation of Spartina densiflora plant growth and metal accumulation upon selective inoculation treatments: A comparison of gram negative and gram positive rhizobacteria

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

doi:10.1016/j.marpolbul.2017.07.072

Cited by 26 publications

(22 citation statements)

References 72 publications

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“…In a similar manner, greater root growth in S. ramosissima inoculated with bacteria may aid to enhance water absorption capacity and, therefore, water content, iWUE and metal tolerance. In line with these results, previous works from authors of this study reported that bioaugmentation with indigenous PGPB incremented i WUE and other photosynthetic parameters like A N and functionality of PSII in halophytes S. densiflora , S. maritima , and Arthrocnemum macrostachyum ( Mateos-Naranjo et al, 2015 ; Mesa et al, 2015a , b ; Navarro-Torre et al, 2017a , b ; Paredes-Páliz et al, 2017 ; Mesa-Marín et al, 2019a ).…”

Section: Discussionsupporting

confidence: 91%

Impact of Plant Growth Promoting Bacteria on Salicornia ramosissima Ecophysiology and Heavy Metal Phytoremediation Capacity in Estuarine Soils

et al. 2020

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Salicornia ramosissima is a C 3 halophyte that grows naturally in South Western Spain salt marshes, under soil salinity and heavy metal pollution (mostly Cu, Zn, As, and Pb) caused by both natural and anthropogenic pressure. However, very few works have reported the phytoremediation potential of S. ramosissima. In this work, we studied a microbe-assisted phytoremediation strategy under greenhouse conditions. We inoculated plant growth promoting (PGP) and heavy metal resistant bacteria in pots with S. ramosissima and natural non-polluted and polluted sediments collected from Spanish estuaries. Then, we analyzed plant ecophysiological and metal phytoaccumulation response. Our data suggested that inoculation in polluted sediments improved S. ramosissima plant growth in terms of relative growth rate (RGR) (32%) and number of new branches (61%). S. ramosissima photosynthetic fitness was affected by heavy metal presence in soil, but bacteria inoculation improved the photochemical apparatus integrity and functionality, as reflected by increments in net photosynthetic rate (21%), functionality of PSII (F m and F v /F m) and electron transport rate, according to OJIP derived parameters. Beneficial effect of bacteria in polluted sediments was also observed by augmentation of intrinsic water use efficiency (28%) and slightly water content (2%) in inoculated S. ramosissima. Finally, our results demonstrated that S. ramosissima was able to accumulate great concentrations of heavy metals, mostly at root level, up to 200 mg Kg −1 arsenic, 0.50 mg Kg −1 cadmium, 400 mg Kg −1 copper, 25 mg Kg −1 nickel, 300 mg Kg −1 lead, and 300 mg Kg −1 zinc. Bioaugmentation incremented S. ramosissima heavy metal phytoremediation potential due to plant biomass increment, which enabled a greater accumulation capacity. Thus, our results suggest the potential use of heavy metal resistant PGPB to ameliorate the capacity of S. ramosissima as candidate for phytoremediation of salty polluted ecosystems.

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Section: Discussionsupporting

confidence: 91%

Impact of Plant Growth Promoting Bacteria on Salicornia ramosissima Ecophysiology and Heavy Metal Phytoremediation Capacity in Estuarine Soils

et al. 2020

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“…In our previous studies, we observed that halophytes in southwestern Spain marshes harbored salt-tolerant rhizobacteria with PGP properties. Those studies were carried on (1) Spartina densiflora [28,48], (2) Arthrocnemum macrostachyum [25,49] and (3) Spartina maritima [27,31,50]. Continuing this research line, the present work describes cultivable rhizomicrobiome of two other important halophytes from southwest Spain, (4) Halimione portulacoides and (5) Salicornia ramosissima.…”

Section: Discussionmentioning

confidence: 89%

Effect of Plant Growth-Promoting Rhizobacteria on Salicornia ramosissima Seed Germination under Salinity, CO2 and Temperature Stress

et al. 2019

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In a scenario of climate change and growing population, halophyte root microbiota interactions may be a sustainable solution to improve alternative crop production while combating abiotic stress. In this work, seeds of the cash crop halophyte Salicornia ramosissima were inoculated with five different plant growth-promoting rhizobacteria consortia, isolated from the rhizosphere of five halophytes in southwestern Spain salt marshes. For the first time, we recorded seed germination response to three interactive abiotic stressors, CO2 (400 and 700 ppm), temperature (25 and 29 ℃) and salinity (171, 510 and 1030 mM NaCl), all of them related to climate change. Salinity played a decisive role, as no significant differences were registered between treatments at 171 mM NaCl and no germination took place at 1030 mM NaCl. At 510 mM NaCl, one rhizobacterial consortium improved seed parameters notably, increasing up to 114% germination percentage and 65% seedlings biomass. These first findings encourage us to think that cash crop halophytes like S. ramosissima and halophyte root microbiota may be valuable resources for human or animal feeding in a future climate reality.

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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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Modulation of Spartina densiflora plant growth and metal accumulation upon selective inoculation treatments: A comparison of gram negative and gram positive rhizobacteria

Cited by 26 publications

References 72 publications

Impact of Plant Growth Promoting Bacteria on Salicornia ramosissima Ecophysiology and Heavy Metal Phytoremediation Capacity in Estuarine Soils

Impact of Plant Growth Promoting Bacteria on Salicornia ramosissima Ecophysiology and Heavy Metal Phytoremediation Capacity in Estuarine Soils

Effect of Plant Growth-Promoting Rhizobacteria on Salicornia ramosissima Seed Germination under Salinity, CO2 and Temperature Stress

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

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