Selenium (Se) is essential for life's basic functions but its sources are limited. Plant growth promoting bacteria is a potential source to increase Se accumulation and plant growth. Bacteria are isolated from native seleniferous soils,. and based on 16S rRNA (ribosomal RNA) sequenceanalysis, two plant growth promoting and selenium tolerant bacteria are selected. They are identified as Leclercia adecarboxylata (B49) and Cedecea neteri (B71). L. adecarboxylata and C. neteri produce indole acetic acid of 93 ± 3.2 and 68 ± 2.9 mg L⁻¹ and a phosphate solubilization index of 1.26 ± 0.3 and 3.29 ± 0.2, respectively. L. adecarboxylata and C. neteri tolerate up to 350 mm of selenite with an inhibitory concentration 50 value of 225.6 ± 14 and 236.6 ± 14 mm, respectively. Inoculation of bacteria significantly increases the growth of Zea mays plants in seleniferous soil. Plant growth promotion is 36.6% more in C. neteri inoculated plants compared to L. adecarboxylata. Se accumulation significantly increases in plant tissues inoculated with C. neteri (20.2 µg g⁻¹) than L. adecarboxylata (12.1 µg g⁻¹). This study has provided evidence that microbial Se biotransformation through bacterial inoculation is an alternative way to improve the Se uptake in crops and maintain human health.

中文翻译：

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从天然含硒土壤中分离的根际细菌促进玉米植物生长和硒积累

硒 (Se) 对生命的基本功能至关重要，但其来源有限。植物生长促进细菌是增加硒积累和植物生长的潜在来源。细菌是从天然含硒土壤中分离出来的。并基于16S rRNA（核糖体RNA）序列分析，筛选出两种植物促生耐硒细菌。它们被鉴定为Leclercia decarboxylata (B49) 和Cedecea neteri (B71)。L. adecarboxylata和C. neteri 分别产生 93 ± 3.2 和 68 ± 2.9 mg L ^-1的吲哚乙酸和1.26 ± 0.3 和 3.29 ± 0.2 的磷酸盐增溶指数。L. adecarboxylata和C. neteri耐受高达 350 m m的亚硒酸盐，抑制浓度 50 值分别为 225.6 ± 14 和 236.6 ± 14 m m。接种细菌显着增加了玉米植物在含硒土壤中的生长。与L. adecarboxylata相比， C. neteri接种植物的植物生长促进作用高出 36.6% 。接种C. neteri (20.2 µg g ⁻¹ ) 的植物组织中的 Se 积累显着高于L. adecarboxylata (12.1 µg g ⁻¹). 这项研究提供的证据表明，通过细菌接种进行的微生物硒生物转化是提高作物硒吸收和维持人类健康的另一种方法。