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Open AccessArticle

Halotolerant Endophytic Bacterium Serratia rubidaea ED1 Enhances Phosphate Solubilization and Promotes Seed Germination

1
Medical Applications Interface Center (CIAM), Mohammed VI Polytechnic University (UM6P), Ben Guerir 43150, Morocco
2
Laboratory of Microbial Biotechnologies, Agrosciences and Environment, Faculty of Sciences Semlalia, Cadi Ayyad University, Marrakesh 40000, Morocco
3
AgrobioSciences Department, Mohammed VI Polytechnic University (UM6P), Ben Guerir 43150, Morocco
4
Laboratory of Molecular Microbiology, Coalition Center, for Innovation, and Prevention of Epidemics in Morocco (CIPEM), Mohammed VI Polytechnic University (UM6P), Ben Guerir 43150, Morocco
5
African Genome Center (AGC), Mohammed VI Polytechnic University (UM6P), Ben Guerir 43150, Morocco
*
Author to whom correspondence should be addressed.
Academic Editor: Cristina Abbate
Agriculture 2021, 11(3), 224; https://doi.org/10.3390/agriculture11030224
Received: 4 February 2021 / Revised: 25 February 2021 / Accepted: 27 February 2021 / Published: 9 March 2021
(This article belongs to the Special Issue Advanced Research of Soil Microbial Functional Diversity)
Quinoa is renowned for its nutritional value and ability to withstand harsh environmental conditions such as salinity. In the present work, we isolated 34 phosphate solubilizing endophytic bacteria associated with the roots of quinoa plants. Based on phosphate solubilization efficiency and biochemical characterization, we selected one isolate named ED1. Ribotyping using partial 16S RNA gene analysis revealed that the selected isolate shares 99.7% identity with Serratia rubidaea. Plant growth promoting (PGP) studies showed that the ED1 strain solubilized complexed forms of phosphate (Ca3(PO4)2). Zinc release from ZnO, Zn3(PO4)2, or ZnCO3 revealed the efficient ZnO solubilization by the ED1 strain. Except for proteases, the strain ED1 produced siderophores, cellulase, ammonia and exhibited oligonitrophilic features. Indole acetic acid (IAA) production was detected with and without the L-tryptophan precursor. Next, we demonstrated that the ED1 strain tolerated 1.5 M NaCl final concentration and exhibited intrinsic resistance to seven antibiotics frequently prescribed for medical use. Moreover, we found that ED1 strain withstood 2 mg/L of Cadmium and 1 mg/L of either Nickel or Copper. Furthermore, we observed that S. rubidaea ED1 stimulated quinoa seeds germination and seedlings growth under salt stress conditions. Lastly, we discuss the advantages versus disadvantages of applying the S. rubidaea ED1 strain as a beneficial agent for salty and/or heavy metals contaminated soils. View Full-Text
Keywords: endophyte; Chenopodium quinoa willd.; Serratia rubidaea; plant growth promotion; salt stress; antibiotics resistance; heavy metals tolerance endophyte; Chenopodium quinoa willd.; Serratia rubidaea; plant growth promotion; salt stress; antibiotics resistance; heavy metals tolerance
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MDPI and ACS Style

Mahdi, I.; Hafidi, M.; Allaoui, A.; Biskri, L. Halotolerant Endophytic Bacterium Serratia rubidaea ED1 Enhances Phosphate Solubilization and Promotes Seed Germination. Agriculture 2021, 11, 224. https://doi.org/10.3390/agriculture11030224

AMA Style

Mahdi I, Hafidi M, Allaoui A, Biskri L. Halotolerant Endophytic Bacterium Serratia rubidaea ED1 Enhances Phosphate Solubilization and Promotes Seed Germination. Agriculture. 2021; 11(3):224. https://doi.org/10.3390/agriculture11030224

Chicago/Turabian Style

Mahdi, Ismail; Hafidi, Mohamed; Allaoui, Abdelmounaaim; Biskri, Latefa. 2021. "Halotolerant Endophytic Bacterium Serratia rubidaea ED1 Enhances Phosphate Solubilization and Promotes Seed Germination" Agriculture 11, no. 3: 224. https://doi.org/10.3390/agriculture11030224

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