CBQF-Centro de Biotecnologia e Química Fina - Laboratório Associado, Escola Superior de Biotecnologia, Universidade Católica Portuguesa/Porto, Rua Dr. António Bernardino de Almeida, 4200-072, Porto, Portugal,
Environ Sci Pollut Res Int. 2014;21(16):9742-53. doi: 10.1007/s11356-014-2848-1. Epub 2014 Apr 26.
Zea mays (L.) is a crop widely cultivated throughout the world and can be considered suitable for phytomanagement due to its metal resistance and energetic value. In this study, the effect of two plant growth-promoting rhizobacteria, Ralstonia eutropha and Chryseobacterium humi, on growth and metal uptake of Z. mays plants in soils contaminated with up to 30 mg Cd kg(-1) was evaluated. Bacterial inoculation increased plant biomass up to 63% and led to a decrease of up to 81% in Cd shoot levels (4-88 mg Cd kg(-1)) and to an increase of up to 186% in accumulation in the roots (52-134 mg Cd kg(-1)). The rhizosphere community structure changed throughout the experiment and varied with different levels of Cd soil contamination, as revealed by molecular biology techniques. Z. mays plants inoculated with either of the tested strains may have potential application in a strategy of soil remediation, in particular short-term phytostabilization, coupled with biomass production for energy purposes.
玉米（Zea mays (L.)）是一种在世界各地广泛种植的作物，由于其具有金属抗性和能源价值，可被视为适合植物修复的作物。在这项研究中，评估了两种植物促生根瘤菌（Ralstonia eutropha 和 Chryseobacterium humi）对受高达 30 mg Cd kg(-1)污染土壤中玉米生长和金属吸收的影响。细菌接种可将植物生物量提高多达 63%，并使 Cd 在植物地上部分的含量降低多达 81%（4-88 mg Cd kg(-1))，并使 Cd 在根部的积累增加多达 186%（52-134 mg Cd kg(-1))。通过分子生物学技术揭示，根际群落结构在整个实验过程中发生了变化，并随不同水平的 Cd 土壤污染而变化。用测试的任何一种菌株接种的玉米植物都可能具有在土壤修复策略中的应用潜力，特别是短期的植物稳定化，同时为能源目的生产生物量。
