Isolation and Influence of Halophilic, Alkaliphilic, and Haloalkaliphilic Rhizospheric Bacteria on the Concentration of Leaf Nutrients in GN15 Almonds Rootstocks

Document Type : Research

Authors

1 Researcher, Soil and Water Department, Khorasan Razavi Agricultural and Natural Resources Research and Education Center, AREEO, Mashhad, Iran.

2 Horticultural Department/ Ferdowsi University of Mashhad/Iran

3 Instructor, Horticulture Crops Research Department, Khorasan Razavi Agricultural and Natural Resources Research and Education Center, AREEO, Mashhad, Iran.

10.22092/rhsj.2024.361994.1057

Abstract

Mechanism of plant growth-promoting extremophilic bacteria in the availability and uptake of nutrients under different stresses varies. Fifty-five halophilic, alkaliphilic, and haloalkaliphilic isolates were isolated and purified from different almond rhizosphere soils in Khorasan Razavi province. Production of indole-3-acetic acid (IAA), quantitative solubility of mineral phosphates (PSB), and production of exopolysaccharides (EPS) in all isolates were investigated in vitro to select superior producer isolates. Six selected isolates were tested near the rootstocks to determine their effect on the concentration and availability of some macro and micronutrients, sodium and chlorine ions in rootstocks with different salinity and alkalinity soils. The highest average production of indole-3-acetic acid, dissolution of mineral phosphates and exopolysaccharide was observed for alkaliphilic (A7, A11), haloalkaliphilic (HA7 and HA9) and halophilic (H10 and H22) bacteria isolates, respectively. Halophilic bacteria showed more efficiency in increasing nitrogen, phosphorus, and potassium of the plant and decreasing sodium plants. Alkaliphilic bacteria with the highest absorption (36.4%) effectively increased trace elements (iron and zinc) in plants. Halophilic bacteria compared to alkaliphilic and haloalkaliphilic bacteria have a higher efficiency with 34.5, 33.3 and 32.2%, respectively, in the absorption of macronutrients; and they also showed no absorption of toxic chlorine and sodium ions (72.3, 65.3 and 62.4%, respectively) for GN15 rootstocks.

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Research in Horticultural Sciences
Volume 3, Issue 1
September 2024
Pages 67-88

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