植物促生根际细菌介导的粉煤灰中金属的诱导植物修复
Induced phytoremediation of metals from fly ash mediated by plant growth promoting rhizobacteria.
作者信息
Tiwari Sadhna, Singh S N, Garg S K
出版信息
J Environ Biol. 2013 Jul;34(4):717-27.
A study was carried out to observe the impact of a consortium of bacteria isolated from the fly ash on the metal accumulation by T. latifolia. When a consortium of bacteria Bacillus endophyticus NBRFT4 (MTCC 9021), Paenibacillus macerans NBRFTS (MTCC 8912) and Bacillus pumilus NBRFT9 (MTCC 8913) was bioaugmented into the rhizosphere of T. latifolia, it enhanced the metal concentration in root, stem and leaves of the plants through increased bioavailability of metals Fe, Cd, Pb, Cr, Ni, Cu and Zn in the fly ash. Besides, these bacteria also promoted the plant growth perhaps due to utilization of ACC, synthesis of phytoharmones and solubilisation of essential metals found in fly ash. As compared to fly ash alone, the accumulation of Fe was maximally enhanced by 164%, 196%, and 251%, followed by Ni by 92%, 44% and 56%, Zn by 82%, 57% and 91%, Cu by 71%, 53% and 60%, Cr by 96%, 80% and 105%, Pb by 119%, 87% and 140%, Cd by 80%, 109% and 115% in root, stem and leaves, respectively in fly ash with bacteria. Thus, an increased solubilisation of metals coupled with enhanced plant growth stimulated the phytoextraction of metals by T. latifolia from fly ash.
开展了一项研究，以观察从粉煤灰中分离出的一组细菌对宽叶香蒲金属积累的影响。当将内生芽孢杆菌NBRFT4（MTCC 9021）、浸麻芽孢杆菌NBRFTS（MTCC 8912）和短小芽孢杆菌NBRFT9（MTCC 8913）这组细菌对宽叶香蒲根际进行生物强化时，通过提高粉煤灰中金属铁、镉、铅、铬、镍、铜和锌的生物有效性，提高了植物根、茎和叶中的金属浓度。此外，这些细菌还可能由于利用ACC、合成植物激素以及溶解粉煤灰中发现的必需金属而促进了植物生长。与单独使用粉煤灰相比，在含有细菌的粉煤灰中，根、茎和叶中铁的积累分别最大提高了164%、196%和251%，其次镍提高了92%、44%和56%，锌提高了82%、57%和91%，铜提高了71%、53%和60%，铬提高了96%、80%和105%，铅提高了119%、87%和140%，镉提高了80%、109%和115%。因此，金属溶解度的增加以及植物生长的增强刺激了宽叶香蒲从粉煤灰中提取金属。
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