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Article

Isolation and Characterization of Phosphate Solubilizing Streptomyces sp. Endemic from Sugar Beet Fields of the Beni-Mellal Region in Morocco

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Laboratory of Biotechnology and Valorization of Plant Genetic Resources, Faculty of Sciences and Technology, University of Sultan Moulay Slimane, P.O. 523, Beni-Mellal 23000, Morocco
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International Water Research Institute, University Mohammed 6 Polytechnic (UM6P), Moulay Rachid, Ben Guerir 43150, Morocco
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Laboratory of Research and Medical Analysis of Gendarmerie Royale, Department of Biosafety PCL3, Rabat, Morocco
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Center of Biotechnology of Sfax (CBS), Laboratory of Environmental Bioprocesses (LBPE), Sfax BP: 1177-3018, Tunisia
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HTMR Laboratory, University Mohammed 6 Polytechnic (UM6P), Moulay Rachid, Ben Guerir 43150, Morocco
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CRRA Rabat, Plant Breeding, Conservation and Valorization of Plant Genetic Resources Research Unit, B.P: 6356-Rabat Institutes, Rabat 415, Morocco
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Institute for Integrative Biology of the Cell (I2BC), Université Paris-Saclay, CEA, CNRS, 91198 Gif-sur-Yvette, France
*
Authors to whom correspondence should be addressed.
Hanane Hamdali and Marie Joëlle Virolle contributed equally.
Academic Editors: Pedro M. Santos and Pedro Castro
Microorganisms 2021, 9(5), 914; https://doi.org/10.3390/microorganisms9050914
Received: 7 April 2021 / Revised: 20 April 2021 / Accepted: 22 April 2021 / Published: 24 April 2021
In the course of our research, aimed at improving sugar beets phosphorus nutrition, we isolated and characterized Streptomyces sp. strains, endemic from sugar beet fields of the Beni-Mellal region, which are able to use natural rock phosphate (RP) and tricalcium phosphate (TCP) as sole phosphate sources. Ten Streptomyces sp. isolates yielded a comparable biomass in the presence of these two insoluble phosphate sources, indicating that they were able to extract similar amount of phosphorus (P) from the latter for their own growth. Interestingly, five strains released soluble P in large excess from TCP in their culture broth whereas only two strains, BP, related to Streptomyces bellus and BYC, related to Streptomyces enissocaesilis, released a higher or similar amount of soluble P from RP than from TCP, respectively. This indicated that the rate of P released from these insoluble phosphate sources exceeded its consumption rate for bacterial growth and that most strains solubilized TCP more efficiently than RP. Preliminary results suggested that the solubilization process of BYC, the most efficient RP and TCP solubilizing strain, involves both acidification of the medium and excretion of siderophores. Actinomycete strains possessing such interesting RP solubilizing abilities may constitute a novel kind of fertilizers beneficial for plant nutrition and more environmentally friendly than chemical fertilizers in current use. View Full-Text
Keywords: insoluble phosphate; biosolubilizing; biofertilizer; Actinobacteria; sugar beet insoluble phosphate; biosolubilizing; biofertilizer; Actinobacteria; sugar beet
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MDPI and ACS Style

Aallam, Y.; Dhiba, D.; Lemriss, S.; Souiri, A.; Karray, F.; Rasafi, T.E.; Saïdi, N.; Haddioui, A.; El Kabbaj, S.; Virolle, M.J.; Hamdali, H. Isolation and Characterization of Phosphate Solubilizing Streptomyces sp. Endemic from Sugar Beet Fields of the Beni-Mellal Region in Morocco. Microorganisms 2021, 9, 914. https://doi.org/10.3390/microorganisms9050914

AMA Style

Aallam Y, Dhiba D, Lemriss S, Souiri A, Karray F, Rasafi TE, Saïdi N, Haddioui A, El Kabbaj S, Virolle MJ, Hamdali H. Isolation and Characterization of Phosphate Solubilizing Streptomyces sp. Endemic from Sugar Beet Fields of the Beni-Mellal Region in Morocco. Microorganisms. 2021; 9(5):914. https://doi.org/10.3390/microorganisms9050914

Chicago/Turabian Style

Aallam, Yassine; Dhiba, Driss; Lemriss, Sanaâ; Souiri, Amal; Karray, Fatma; Rasafi, Taoufik E.; Saïdi, Nezha; Haddioui, Abdelmajid; El Kabbaj, Saâd; Virolle, Marie J.; Hamdali, Hanane. 2021. "Isolation and Characterization of Phosphate Solubilizing Streptomyces sp. Endemic from Sugar Beet Fields of the Beni-Mellal Region in Morocco" Microorganisms 9, no. 5: 914. https://doi.org/10.3390/microorganisms9050914

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