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Enhancement of phosphate solubilization by endophytic bacteria under salinity and phosphorus deficiency stress conditions

Shahzod AxanbayevSamarkand State University named after Sharof Rashidov , University Boulevard 15 , 140104 , Samarkand , UzbekistanЗафар РахмоновKimyo International University in Tashkent Samarkand branch , 63 H.Abdullaev str , Samarkand , 140103 , UzbekistanMukhammad NorboyevSamarkand State University named after Sharof Rashidov , University Boulevard 15 , 140104 , Samarkand , UzbekistanIxtiyor AkramovSamarkand State University named after Sharof Rashidov , University Boulevard 15 , 140104 , Samarkand , UzbekistanBegali ALIKULOVSamarkand State University named after Sharof Rashidov , University Boulevard 15 , 140104 , Samarkand , UzbekistanZafar ISMAILOVSamarkand State University named after Sharof Rashidov , University Boulevard 15 , 140104 , Samarkand , UzbekistanDiyora NARBAYEVASamarkand State University named after Sharof Rashidov , University Boulevard 15 , 140104 , Samarkand , UzbekistanUktam MirzaevSamarkand State Pedagogical Institute , Spitamin 161 , Samarkand 140102 , UzbekistanUgiloy KhidirovaSamarkand State Veterinary Medicine , Animal Husbandry and Biotechnology University , Mirzo Ulugbek-77 , Samarkand 140100 , UzbekistanAminjon MusurmonovSamarkand State Medical University , Samarkand 140100 , Uzbekistan

2026

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Litsenziya: cc-by

ABI

Annotatsiya

Soil salinization and phosphorus (P) deficiency are critical environmental challenges that severely limit global agricultural productivity, particularly in the arid regions of Uzbekistan.Under saline conditions, P is rapidly immobilized, becoming unavailable for plant uptake, which leads to stunted growth and significant yield losses.This study addresses the urgent need for sustainable bio-remediation by evaluating halotolerant endophytic bacteria as effective bio-fertilizers.Several endophytic bacterial strains isolated from native halophytes were screened for their tolerance to extreme salinity (up to 10% NaCl) and their ability to solubilize insoluble phosphates.The most potent isolates, Pseudomonas putida KoPr129 and Bacillus amyloliquefaciens HAPH2, were biochemically characterized for plant growth-promoting (PGP) traits, including IAA, ammonia, and HCN production.A 6-week greenhouse pot experiment was conducted to validate their efficacy on wheat (Triticum aestivum L.) under 150 mM NaCl stress and P-deficient conditions.In vitro assays confirmed that P. putida KoPr129 maintained a robust phosphate solubilization index (FPI 18.16±0.56mm) even at 10% NaCl.Greenhouse trials demonstrated that inoculation with these endophytes significantly mitigated the negative impacts of combined stress.Specifically, P. putida KoPr129 increased wheat shoot length by 9% and more than doubled the total phosphorus uptake (over 130% increase) compared to the non-inoculated stressed control.Biochemical profiling revealed high levels of IAA production in both strains, facilitating enhanced root architecture and nutrient acquisition.Our findings demonstrate that halotolerant endophytes, particularly P. putida KoPr129, are superior candidates for the development of effective bio-inoculants.These results provide a promising pathway to restore soil fertility and improve wheat productivity in degraded, saline-alkali landscapes, offering a sustainable alternative to chemical fertilizers.

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DOI: 10.12911/22998993/221090

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