نوع مقاله : علمی پژوهشی
نویسندگان
1 محقق، بخش تحقیقات خاک و آب، مرکز تحقیقات و آموزش کشاورزی و منابع طبیعی خراسان رضوی/ سازمان تحقیقات، آموزش و ترویج کشاورزی/ مشهد/ ایران
2 گروه علوم باغبانی/ دانشگاه فردوسی مشهد/ ایران
3 مربی پژوهش، بخش تحقیقات علوم زراعی – باغی، مرکز تحقیقات و آموزش کشاورزی و منابع طبیعی خراسان رضوی/ سازمان تحقیقات، آموزش و ترویج
چکیده
کلیدواژه‌ها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
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.
کلیدواژه‌ها [English]
)