Abstract

This work aimed to evaluate the potential use of plant growth-promoting actinobacteria (PGPA) for enhanced cadmium (Cd) phytoremediation and plant growth. Forty-two actinobacteria were isolated from rhizosphere soils in Thailand. Among isolates tested, only Streptomyces phaeogriseichromatogenes isolate COS4, showed the high ability to produce siderophores as a plant growth stimulant and had a strong Cd tolerance potential. The significance of siderophores production and Cd tolerance ability under different Cd concentrations suggests the potential of isolate COS4 to work effectively. Plant culture revealed that the significant increase in root length, root to tip length, and total dried weight of sunflower were obtained after 2 h incubation of sunflower seeds with isolate COS4. The efficiency of Cd uptake was found to range between 42.3 and 61.3%. Translocation factor results confirmed that plant growth promoting S. phaeogriseichromatogenes isolate COS4-assisted phytoremediation can be considered as Cd absorbents for the restoration of polluted sites due to high translocation values.

摘要

这项工作旨在评估植物生长促进放线菌 (PGPA) 在增强镉 (Cd) 植物修复和植物生长方面的潜在用途。从泰国的根际土壤中分离出 42 种放线菌。在测试的分离株中，只有Streptomyces phaeogriseichromatogenes分离出 COS4，显示出产生铁载体作为植物生长刺激剂的高能力，并具有很强的 Cd 耐受潜力。不同 Cd 浓度下铁载体产生和 Cd 耐受能力的显着性表明分离株 COS4 具有有效工作的潜力。植物培养表明，向日葵种子与分离株 COS4 孵育 2 小时后，向日葵的根长、根尖长度和总干重显着增加。发现 Cd 吸收的效率在 42.3% 和 61.3% 之间。易位因子结果证实，植物生长促进S. phaeogriseichromatogenes分离株 COS4 辅助的植物修复可被视为 Cd 吸收剂，由于易位值高，可用于修复污染场地。