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Article

Multiple Potential Plant Growth Promotion Activities of Endemic Streptomyces spp. from Moroccan Sugar Beet Fields with Their Inhibitory Activities against Fusarium spp.

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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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Faculty of Medecine and Pharmacy, University Hassan II, Casablanca 20250, Morocco
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International Water Research Institute (IWRI), Moulay Rachid, University Mohammed 6 Polytechnic (UM6P), Ben Guerir 43150, Morocco
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Laboratory of Research and Medical Analysis of Gendarmerie Royale, Department of Biosafety PCL3, Rabat 10090, Morocco
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UFZ—Helmholtz-Centre for Environmental Research, Soil Ecology Department, Theodor-Lieser-Straße 4, 06120 Halle, Germany
*
Author to whom correspondence should be addressed.
Academic Editors: Pedro M. Santos and Pedro Castro
Microorganisms 2021, 9(7), 1429; https://doi.org/10.3390/microorganisms9071429
Received: 19 May 2021 / Revised: 5 June 2021 / Accepted: 11 June 2021 / Published: 2 July 2021
The characterized 10 Streptomyces isolates were previously selected by their abilities to solubilize phosphates. To investigate whether these isolates represent multifaceted plant growth-promoting rhizobacteria (PGPR), their potassium-solubilizing, auxin-producing and inhibitory activities were determined. The 10 Streptomyces spp. yielded a variable biomass in the presence of insoluble orthoclase as the sole potassium (K) source, indicating that they were able to extract different amounts of K from this source for their own growth. Three strains (AZ, AYD and DE2) released soluble K from insoluble orthoclase in large amounts into the culture broth. The production levels ranged from 125.4 mg/L to 216.6 mg/L after 5 days of culture. Only two strains, Streptomyces enissocaesilis (BYC) and S. tunisiensis (AI), released a larger amount of soluble K from orthoclase and yielded much more biomass. This indicated that the rate of K released from this insoluble orthoclase exceeded its consumption rate for bacterial growth and that some strains solubilized K more efficiently than others. The results also suggest that the K solubilization process of AZ, AYD and DE2 strains, the most efficient K-solubilizing strains, involves a slight acidification of the medium. Furthermore, these 10 Streptomyces spp. were able to secrete indole acetic acid (IAA) in broth medium and ranged from 7.9 ± 0.1 µg/mL to 122.3 ± 0.1 µg/mL. The results of the antibiosis test proved the potential of the 10 tested strains to limit the growth of fungi and bacteria. In dual culture, S. bellus (AYD) had highest inhibitory effect against the three identified fungal causal agents of root rot of sugar beet: Fusarium equiseti and two F. fujikuroi at 55, 43 and 36%, respectively. Streptomyces enissocaesilis (BYC), S. bellus (AYD) and S. saprophyticus (DE2) exhibited higher multifaceted PGPR with their potassium-solubilizing, auxin-producing and inhibitory activities, which could be expected to lead to effectiveness in field trials of sugar beet. View Full-Text
Keywords: Streptomyces spp.; potassium solubilization; orthoclase; biocontrol; root rot; sugar beet Streptomyces spp.; potassium solubilization; orthoclase; biocontrol; root rot; sugar beet
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MDPI and ACS Style

Aallam, Y.; Maliki, B.E.; Dhiba, D.; Lemriss, S.; Souiri, A.; Haddioui, A.; Tarkka, M.; Hamdali, H. Multiple Potential Plant Growth Promotion Activities of Endemic Streptomyces spp. from Moroccan Sugar Beet Fields with Their Inhibitory Activities against Fusarium spp. Microorganisms 2021, 9, 1429. https://doi.org/10.3390/microorganisms9071429

AMA Style

Aallam Y, Maliki BE, Dhiba D, Lemriss S, Souiri A, Haddioui A, Tarkka M, Hamdali H. Multiple Potential Plant Growth Promotion Activities of Endemic Streptomyces spp. from Moroccan Sugar Beet Fields with Their Inhibitory Activities against Fusarium spp. Microorganisms. 2021; 9(7):1429. https://doi.org/10.3390/microorganisms9071429

Chicago/Turabian Style

Aallam, Yassine, Bouchra E. Maliki, Driss Dhiba, Sanaa Lemriss, Amal Souiri, Abdelmajid Haddioui, Mika Tarkka, and Hanane Hamdali. 2021. "Multiple Potential Plant Growth Promotion Activities of Endemic Streptomyces spp. from Moroccan Sugar Beet Fields with Their Inhibitory Activities against Fusarium spp." Microorganisms 9, no. 7: 1429. https://doi.org/10.3390/microorganisms9071429

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