Nanotechnology is an effective way to stimulate the yield potential of crops. Various nano-fertilizers and nano-carriers are gradually being developed to bring about a technological revolution in the agricultural industry. As a biocompatible water-soluble nanomaterial, carbon dots (CDs) have attracted the attention of researchers for applications in agriculture. In this study, we prepared nitrogen-doped CDs (N-CDs) as a type of water-soluble carbon nanofertilizer by a one-pot hydrothermal method, and investigated its effects on lettuce biomass and quality. 100 and 200 mg L−1 of N-CDs substantially promoted lettuce biomass accumulation (41.70%), elevated lettuce nutrient content, as well as promoted the accumulation of major nutrients. Moreover, 100 mg L−1 N-CDs increased the chlorophyll a content by 12.68%, significantly increased the electron transport rate (ETR) by 38.61%, significantly increased the light energy conversion efficiency (Y(II)) by 31.24% and increased the Rubisco activity by 60.61%, which are important reasons for its increase in actual photosynthesis rate. N-CDs also have a positive effect on plant nitrogen metabolism by promoting the activity of glutamine synthetase. The significant benefits of N-CDs on lettuce make them have great potential for agricultural yield increase and quality improvement.
As biocompatible water-soluble nanomaterials, carbon dots (CDs) have attracted the interest of researchers in agricultural production. In this work, cerium-doped carbon dots (Ce-CDs) have been prepared as a water-soluble carbon nano-fertilizer using a one-pot hydrothermal method. The effects on lettuce yield and quality are investigated. The application of lower concentrations of Ce-CDs (50–150 mg L−1) all contributes to lettuce yield and quality enhancement. 100 mg L−1 of Ce-CDs demonstrates the most significant effect, increasing biomass by about 83.3% and promoting the accumulation of soluble sugars (87.5%) and soluble proteins (52.3%). Further investigation reveals that Ce-CDs can promote the electron transfer rate (33.35%), photosynthetic activity (30.28%), photoconversion efficiency (37.90%) and Rubisco activity (37.38%), and have a promoting effect on glutamine synthetase (GS, 3.10%) and glutamate synthase (GOGAT, 10.09%) activities. Regarding the net photosynthetic rate (54.99%), Ce-CDs elevate and induce stomatal opening and promote nutrient accumulation. This work not only evaluates the effects of rare earth-doped CDs as nano-fertilizers on plants but also provides strong technical support for the application of nano-fertilizers in practical production and life sciences.
危险品化学品经营许可证（带存储）