Wang Hui, Kang Yunyan, Li Hui, Huang Sirui, Li Wei, Zheng Mingtao, Huang Riming, Lei Bingfu, Yang Xian
College of Horticulture, South China Agricultural University, Guangzhou 510642, P. R. China.
Key Laboratory for Biobased Materials and Energy of Ministry of Education, Guangdong Provincial Engineering Technology Research Center for Optical Agriculture, College of Materials and Energy, South China Agricultural University, Guangzhou 510642, P. R. China.
ACS Omega. 2021 Nov 18;6(47):32262-32269. doi: 10.1021/acsomega.1c05074. eCollection 2021 Nov 30.
With global warming, plants often suffer damage from high temperatures during the growth process, which inhibits their growth. In this work, carbon dots (CDs), synthesized by () with a one-step hydrothermal method, were selected as heat-resistant enhancement agents for plants. Inspired by this background, this work studied Italian lettuce grown at 25, 35, and 45 °C and treated with CD and deionized water control (sprayed on leaves). The results showed that the biomass, chlorophyll content, net photosynthetic rate, activities of SOD (superoxide dismutase), POD (peroxidase), CAT (catalase), soluble sugar, and soluble protein contents of lettuce treated by CDs were increased while the contents of malondialdehyde (MDA) and proline (Pro) were decreased at 35 and 45 °C. The application of CDs at 35 and 45 °C could maintain the growth of plants by reducing oxidative damage and lipid peroxidation especially at the temperature of 35 °C, the growth status of lettuce treated by CDs was no different from that of lettuce grown naturally at the optimal temperature of 25 °C, or even better than the latter. This finding verified that the CDs could significantly improve the high-temperature tolerance of lettuce, thus alleviating the heat stress of plants.
随着全球变暖，植物在生长过程中常常遭受高温损害，这抑制了它们的生长。在这项工作中，通过（）一步水热法合成的碳点（CDs）被选为植物的耐热增强剂。受此背景启发，这项工作研究了在25、35和45°C下生长并用CD和去离子水对照（喷洒在叶片上）处理的意大利生菜。结果表明，在35和45°C下，用CDs处理的生菜的生物量、叶绿素含量、净光合速率、超氧化物歧化酶（SOD）、过氧化物酶（POD）、过氧化氢酶（CAT）的活性、可溶性糖和可溶性蛋白质含量增加，而丙二醛（MDA）和脯氨酸（Pro）的含量降低。在35和45°C下施用CDs可以通过减少氧化损伤和脂质过氧化来维持植物的生长，特别是在35°C时，用CDs处理的生菜的生长状况与在最佳温度25°C下自然生长的生菜无异，甚至优于后者。这一发现证实了CDs可以显著提高生菜的高温耐受性，从而减轻植物的热应激。
