Milla-Moreno Estefanía, Guy Robert Dean, Soolanayakanahally Raju Y
Department of Forest and Conservation Sciences, Faculty of Forestry, University of British Columbia, Forest Sciences Centre, 2424 Main Mall, Vancouver, BC V6T 1Z4, Canada.
Indian Head Research Farm, Agriculture and Agri-Food Canada, Indian Head, SK S0G 2K0, Canada.
Toxics. 2022 May 6;10(5):237. doi: 10.3390/toxics10050237.
In the present climate emergency due to global warming, we are urged to move away from fossil fuels and pursue a speedy conversion to renewable energy systems. Consequently, copper (Cu) will remain in high demand because it is a highly efficient conductor used in clean energy systems to generate power from solar, hydro, thermal and wind energy across the world. Chile is the global leader in copper production, but this position has resulted in Chile having several hundred tailing deposits. We grew two Chilean native hardwood species, quillay ( Molina) and espino ( (Molina) Seigler & Ebinger, under three increasing Cu levels (0, 50, and 100 µM) for 6 months in a greenhouse setting. We measured growth, photosynthetic performance and elemental contents of leaves and roots to further evaluate their potential for phytoremediation. Growth of quillay was unaffected by Cu treatment but growth of espino was enhanced, as was its photosynthetic performance, indicating that espino may have an unusually high requirement for copper. Excess Cu was mostly restricted to the roots of both species, where X-ray fluorescence (XRF) mapping indicated some tendency for Cu to accumulate in tissues outside the periderm. Calcium oxalate crystals were prominently visible in XRF images of both species. Nickel (but not Cu) showed a concurrent distribution pattern with these crystals.
在当前因全球变暖而出现的气候紧急状况下，我们被敦促摆脱化石燃料，迅速转向可再生能源系统。因此，铜（Cu）的需求将持续居高不下，因为它是一种高效导体，用于全球各地的清洁能源系统，从太阳能、水能、热能和风能中发电。智利是全球铜产量的领先者，但这一地位导致智利有数百个尾矿矿床。我们在温室环境中，将两种智利本土硬木树种，皂树（莫利纳）和刺桐（（莫利纳）西格勒和埃宾格），置于三种不断增加的铜水平（0、50和100微摩尔）下培养6个月。我们测量了生长情况、光合性能以及叶片和根系的元素含量，以进一步评估它们进行植物修复的潜力。皂树的生长不受铜处理的影响，但刺桐的生长得到增强，其光合性能也是如此，这表明刺桐可能对铜有异常高的需求。过量的铜大多局限于两种树种的根部，X射线荧光（XRF）图谱显示铜有在周皮外组织中积累的趋势。草酸钙晶体在两种树种的XRF图像中都很明显。镍（而非铜）与这些晶体呈现出同时分布的模式。
