The biotoxicity and environmental applications of carbon nanomaterials have always been the focus of research. In this research, functional carbon nanodots (FCNs) show high promotion effects on regulating the growth, development and yield of tomato under drought stress, due to their up-regulation effects on the physiological processes of plants including photosynthesis, antioxidant system, osmotic adjustment, as well as soil amelioration in physicochemical properties and microbial environment during vegetative and reproductive growth stage. The reduction of tissue water content and water use efficiency are moderated by FCNs through improving root vigor and osmolytes (soluble sugar and proline) level, which contributes to maintain the enzyme function, photosynthesis and nutrient uptake in plant. FCNs regulate the enzymatic and non-enzymatic antioxidant system to scavenge reactive oxygen species (ROS) and inhibit the lipid peroxidation, thus protect the membrane structure and function of plant cells under stress. FCNs up-regulate soil microbial communities under drought stress by regulating the soil pH, enzyme activity, organic carbon and organic matters contents. Our results prove that FCNs are biological friendly to plant growth and soil environment under drought stress, thus exhibit potential as emendator to promote plant tolerance and improve agricultural productivity in water-deficient areas.

碳纳米材料的生物毒性和环境应用一直是研究的重点。在这项研究中，功能性碳纳米点（FCNs）对干旱胁迫下番茄的生长发育和产量具有高度促进作用，因为它们对植物的光合作用、抗氧化系统、渗透调节、以及营养和生殖生长阶段土壤理化性质和微生物环境的改善。FCNs 通过提高根活力和渗透剂（可溶性​​糖和脯氨酸）水平来缓和组织水分含量和水分利用效率的降低，这有助于维持植物的酶功能、光合作用和养分吸收。FCNs调节酶和非酶抗氧化系统，清除活性氧（ROS），抑制脂质过氧化，从而保护植物细胞在胁迫下的膜结构和功能。FCNs通过调节土壤pH、酶活性、有机碳和有机质含量来上调干旱胁迫下的土壤微生物群落。我们的研究结果证明，FCNs对干旱胁迫下的植物生长和土壤环境具有生物友好性，因此具有作为促进植物耐受性和提高缺水地区农业生产力的改良剂的潜力。FCNs通过调节土壤pH、酶活性、有机碳和有机质含量来上调干旱胁迫下的土壤微生物群落。我们的研究结果证明，FCNs对干旱胁迫下的植物生长和土壤环境具有生物友好性，因此具有作为促进植物耐受性和提高缺水地区农业生产力的改良剂的潜力。FCNs通过调节土壤pH、酶活性、有机碳和有机质含量来上调干旱胁迫下的土壤微生物群落。我们的研究结果证明，FCNs对干旱胁迫下的植物生长和土壤环境具有生物友好性，因此具有作为促进植物耐受性和提高缺水地区农业生产力的改良剂的潜力。