Changsha General Survey of Natural Resources Center, Changsha, China.
College of Resources and Environment, Yangtze University, Wuhan, China.
Environ Geochem Health. 2024 Jan 16;46(2):48. doi: 10.1007/s10653-023-01837-9.
This study was conducted to investigate the impact of supplementing blue and red light on the biomass yield, metal uptake, contaminant purification, and the alleviation of leaching risks by Noccaea caerulescens, a well-known hyperaccumulator of Cd and Zn. As previously reported for the closely related Thlaspi arvense, N. caerulescens retarded the leaching of Cd and Zn but aggravated the leaching of Pb and Cu, because the species mobilized all metals in soil but only extracted Cd and Zn. Monochromic red light reduced the leaching of Pb and Cu by 13.8% and 1.3%, respectively, but simultaneously weakened Cd phytoremediation by reducing shoot biomass. Our results demonstrated that a small proportion of blue light (10%) could eliminate the negative effect of monochromatic red light on plant shoot growth. However, root biomass decreased by 14.3%, 26.2%, 21.4%, and 61.9% as the percentage of blue light increased from 10 to 100%. Noccaea caerulescens generated the most biomass and accumulated the highest metal concentrations, except for Pb, when the ratio of red to blue light was 1:1. In addition, leachate volume was significantly reduced under the 10% and 50% blue light treatments compared to other light treatments. Therefore, light supplementation with a suitable proportion of blue light can enhance metal purification by N. caerulescens and alleviate potential leaching risk during phytoremediation.
这项研究旨在探讨补充红蓝光照对生物量产量、金属吸收、污染物净化以及缓解念珠藻（一种 Cd 和 Zn 的超积累植物）淋滤风险的影响。正如先前对密切相关的遏蓝菜（Thlaspi arvense）的报道，念珠藻延迟了 Cd 和 Zn 的淋滤，但加剧了 Pb 和 Cu 的淋滤，因为该物种在土壤中动员了所有金属，但仅提取了 Cd 和 Zn。单色红光分别减少了 13.8%和 1.3%的 Pb 和 Cu 的淋滤，但同时通过减少地上部生物量来削弱 Cd 的植物修复。我们的结果表明，少量的蓝光（10%）可以消除单色红光对植物地上部生长的负面影响。然而，当蓝光比例从 10%增加到 100%时，根生物量分别减少了 14.3%、26.2%、21.4%和 61.9%。除了 Pb 之外，当红光与蓝光的比例为 1:1 时，念珠藻产生的生物量最多，积累的金属浓度最高。此外，与其他光照处理相比，在 10%和 50%的蓝光处理下，淋出液体积显著减少。因此，适当比例的蓝光补充可以增强念珠藻对金属的净化作用，并减轻植物修复过程中的潜在淋滤风险。
