The Center for Sustainable Nanotechnology, Department of Chemistry, University of Wisconsin, Madison, WI, USA.
The Center for Sustainable Nanotechnology, Department of Analytical Chemistry, The Connecticut Agricultural Experiment Station, New Haven, CT, USA.
Nat Nanotechnol. 2020 Dec;15(12):1033-1042. doi: 10.1038/s41565-020-00776-1. Epub 2020 Oct 19.
Customized Cu(PO) and CuO nanosheets and commercial CuO nanoparticles were investigated for micronutrient delivery and suppression of soybean sudden death syndrome. An ab initio thermodynamics approach modelled how material morphology and matrix effects control the nutrient release. Infection reduced the biomass and photosynthesis by 70.3 and 60%, respectively; the foliar application of nanoscale Cu reversed this damage. Disease-induced changes in the antioxidant enzyme activity and fatty acid profile were also alleviated by Cu amendment. The transcription of two dozen defence- and health-related genes correlates a nanoscale Cu-enhanced innate disease response to reduced pathogenicity and increased growth. Cu-based nanosheets exhibited a greater disease suppression than that of CuO nanoparticles due to a greater leaf surface affinity and Cu dissolution, as determined computationally and experimentally. The findings highlight the importance and tunability of nanomaterial properties, such as morphology, composition and dissolution. The early seedling foliar application of nanoscale Cu to modulate nutrition and enhance immunity offers a great potential for sustainable agriculture.
定制的 Cu(PO) 和 CuO 纳米片以及商业 CuO 纳米颗粒被用于研究微量营养素的输送和大豆猝死综合征的抑制。从头热力学方法模拟了材料形态和基质效应对营养释放的控制。感染分别使生物量和光合作用降低了 70.3%和 60%；叶面喷施纳米级 Cu 逆转了这种损伤。Cu 处理还减轻了病害引起的抗氧化酶活性和脂肪酸谱的变化。二十几个防御和健康相关基因的转录表明，纳米级 Cu 增强了先天的疾病反应，降低了致病性并促进了生长。基于 Cu 的纳米片比 CuO 纳米颗粒表现出更好的疾病抑制效果，这是由于计算和实验确定的更大的叶片表面亲和力和 Cu 溶解。这些发现强调了纳米材料性质（如形态、组成和溶解）的重要性和可调性。早期幼苗叶面喷施纳米级 Cu 以调节营养和增强免疫力，为可持续农业提供了巨大的潜力。
