Department of Environmental Science , Baylor University , One Bear Place No. 97266 , Waco , Texas 76798-7266 , United States.
Department of Civil Engineering , Taiyuan University of Technology , Yingze West Street No. 79 , Taiyuan , Shanxi , China 030024.
Environ Sci Technol. 2018 Dec 4;52(23):13728-13737. doi: 10.1021/acs.est.8b03731. Epub 2018 Nov 15.
A factorial study was conducted to evaluate the phytotoxicity of copper oxide nanoparticles (nCuO, 0.1-100 mg/L), arsenic (As, 0 and 10 mg/kg), and their interaction to rice plants ( Oryza sativa japonica 'Koshihikari') during the life cycle. No significant effect was observed on seed germination. The main effects of nCuO and As were observed on lengths and biomasses of seedling shoots and roots and on root branching. The interaction between nCuO and As also significantly influenced these parameters. nCuO addition increased Cu uptake in seedlings and generally improved seedling growth. With As addition, As was highly concentrated in roots and increased in shoots, and seedling growth was also inhibited. Additionally, nCuO and As had significant main and interaction effects on mature plant dry biomass, panicle number, total grain weight, average grain weight, and several other panicle parameters. Moreover, nCuO and As interacted to affect panicle emergence. nCuO also decreased As accumulation in dehusked grains. The accelerated heading stage by nCuO may help shorten the life cycle of rice plants, thereby reducing As accumulation in grains. This study is the first to examine the influence of nCuO in combination with As on the life cycle of rice plants.
采用析因试验研究了氧化铜纳米颗粒（nCuO，0.1-100mg/L）、砷（As，0 和 10mg/kg）及其交互作用对水稻全生育期的植物毒性。未观察到种子发芽有显著影响。nCuO 和 As 的主要作用表现为对幼苗地上部和地下部的长度和生物量以及根分枝的影响。nCuO 和 As 的相互作用也显著影响这些参数。添加 nCuO 增加了幼苗对 Cu 的吸收，通常促进了幼苗的生长。添加 As 后，As 高度集中在根部并转移到地上部，同时也抑制了幼苗的生长。此外，nCuO 和 As 对成熟植株干生物量、穗数、总粒重、平均粒重和其他几个穗参数有显著的主效应和互作效应。此外，nCuO 和 As 相互作用影响穗的出芽。nCuO 还降低了糙米中 As 的积累。nCuO 加速的抽穗期可能有助于缩短水稻植株的生命周期，从而减少谷粒中 As 的积累。本研究首次研究了 nCuO 与 As 联合对水稻全生育期的影响。
