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Plant Growth-Promoting Bacterium from Non-Agricultural Soil Improves Okra Plant Growth

Author

Listed:
  • Heba Adel AlAli

    (Al Bilad Bank Scholarly Chair for Food Security in Saudi Arabia, the Deanship of Scientific Research, the Vice Presidency for Graduate Studies and Scientific Research, Al-Ahsa 31982, Saudi Arabia
    Biological Sciences Department, College of Science, King Faisal University, Al-Ahsa 31982, Saudi Arabia)

  • Ashraf Khalifa

    (Al Bilad Bank Scholarly Chair for Food Security in Saudi Arabia, the Deanship of Scientific Research, the Vice Presidency for Graduate Studies and Scientific Research, Al-Ahsa 31982, Saudi Arabia
    Biological Sciences Department, College of Science, King Faisal University, Al-Ahsa 31982, Saudi Arabia
    Botany and Microbiology Department, Faculty of Science, Beni-Suef University, Beni-Suef 62521, Egypt)

  • Mohammed Almalki

    (Al Bilad Bank Scholarly Chair for Food Security in Saudi Arabia, the Deanship of Scientific Research, the Vice Presidency for Graduate Studies and Scientific Research, Al-Ahsa 31982, Saudi Arabia
    Biological Sciences Department, College of Science, King Faisal University, Al-Ahsa 31982, Saudi Arabia)

Abstract

Beneficial soil microorganisms influence nutrient recycling, soil fertility, plant growth, and productivity and reduce chemical fertilizer application. This study aimed to isolate bacteria from non-agricultural soils in the Al-Ahsa region and characterize the bacteria with the best biostimulating characteristics at the physiological, biochemical, and molecular level. DPM17, a bacterial isolate, promotes plant growth through phosphate solubilization, nitrogen fixation, and ammonia production. DPM17 also produces the phytohormones, indole acetic acid (IAA; 4.516 μg mL −1 ) and gibberellin (1.33 µg mL −1 ), and ammonia (0.06 µg mL −1 ). Additionally, DPM17 grows in the presence of up to 10% NaCl, indicating its halophilic nature. DPM17 was identified as Bacillus baekryungensis based on comparative sequence analysis of the 16S rRNA gene, and neighbor-joining phylogenetic analyses indicated that DPM17 was 96.51% identified to Bacillus sp. DPM17 inoculation substantially improved Abelmoschus esculentus (okra) root length, lateral root count, and dry weight from 7.03 to 9.41 ( p = 0.03), 3.2 to 7.2, and 6 to 13 mg ( p = 0.032), respectively. The results suggest that DPM17 enhances plant growth and can be exploited to develop efficient formulations for sustainable agriculture and food security in Saudi Arabia.

Suggested Citation

  • Heba Adel AlAli & Ashraf Khalifa & Mohammed Almalki, 2022. "Plant Growth-Promoting Bacterium from Non-Agricultural Soil Improves Okra Plant Growth," Agriculture, MDPI, vol. 12(6), pages 1-10, June.
    • Handle: RePEc:gam:jagris:v:12:y:2022:i:6:p:873-:d:840868
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    References listed on IDEAS

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    1. Vu Phong Lam & Mun Haeng Lee & Jong Seok Park, 2020. "Optimization of Indole-3-Acetic Acid Concentration in a Nutrient Solution for Increasing Bioactive Compound Accumulation and Production of Agastache rugosa in a Plant Factory," Agriculture, MDPI, vol. 10(8), pages 1-14, August.
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