Views: 1 Author: Site Editor Publish Time: 2022-06-08 Origin: Site
3. High-efficiency solid-state deep ultraviolet light-emitting carbon dots
In March this year, the research team of the School of Materials Science and Engineering of Anhui University cooperated with the research team of the Russian Academy of Sciences' Yofei Institute, the research team of the Institute of Physical Sciences of Anhui University, and the research team of the National Synchrotron Radiation Laboratory of the University of Science and Technology of China to innovatively synthesize a High-efficiency solid-state deep ultraviolet light-emitting carbon dots and their preparation into light-emitting devices for promoting plant growth and nutrient enrichment.
Inspired by the highly compartmentalized structure inside living cells, the researchers proposed a novel sp3-compartmentalization strategy for the preparation of both narrow emission (half-width 24 nm), high solid-state The deep ultraviolet emitting carbon dots (maximum emission wavelength of 308 nm) have the advantages of quantum yield (20.2%) and good environmental adaptability. Based on the good optical properties of the carbon dots, the research team made them into deep ultraviolet light-emitting devices for further application in plant lighting, which significantly increased the content of nutrients such as ascorbic acid and anthocyanin in plants.
This research work provides a new idea for the rational design of the structure and properties of carbon dots, and at the same time expands the application of carbon dots in ultraviolet light-emitting devices and plant lighting.
4. UV-B activates tomato gene expression
In February this year, researchers from the School of Agriculture and Biology, Shanghai Jiao Tong University revealed that under UV-B treatment, the tomato transcription factor module BBX20/21-HY5 activates the transcription of the HY5 gene, while the excessively accumulated HY5 protein inhibits its own gene transcription. It forms its own negative feedback loop, maintains the level of HY5 in the body, and regulates the photomorphogenesis of tomato.
In the research work, the researchers found that the ability of UV light to activate HY5 gene expression was significantly reduced in tomato bbx20 bbx21 double mutant and hy5 single mutant. To this end, they used tomato rup mutants and found that the RUP negative regulatory loop only inhibited the transcriptional expression of HY5 in the early stage, while the negative regulation in the later stage was mainly regulated by the HY5 protein itself. Therefore, there are at least two distinct negative feedback loops on the photoreceptor UVR8 signaling pathway, which play roles in the early and late stages of light signal transduction, respectively, balancing the plant response to UV-B light.
The research results systematically analyzed the regulatory mechanism of UV-induced transient HY5 transcription using the horticultural crop tomato as the material, further expanded the UV-B transcriptional regulatory network, and provided a new theoretical support for facility horticultural plants to respond to light environmental signals.
