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Cycling Dof Factor 3 mediates light-dependent ascorbate biosynthesis by activating GDP-L-galactose phosphorylase in Rosa roxburghii fruit.
Plant Physiol
January 2025
Guizhou Engineering Research Center for Fruit Crops, Agricultural College, Guizhou University, Guiyang, Guizhou, China.
Light plays an important role in determining the L-ascorbate (AsA) pool size in plants, primarily through the transcriptional regulation of AsA metabolism-related genes. However, the specific mechanism of transcriptional induction responsible for light-dependent AsA biosynthesis remains unclear. In this study, we used a promoter sequence containing light-responsive motifs from GDP-L-galactose phosphorylase 2 (RrGGP2), a key gene involved in AsA overproduction in Rosa roxburghii fruits, to identify participating transcription factors.
View Article and Find Full Text PDFVery-light-intensity exercise as minimal intensity threshold for activating dorsal hippocampal neurons: Evidence from rat physiological exercise model.
Biochem Biophys Res Commun
December 2024
Laboratory of Exercise Biochemistry and Neuroendocrinology, Institute of Health and Sport Sciences, University of Tsukuba, Tsukuba, Ibaraki, 305-8574, Japan; Division of Sport Neuroscience, Kokoro Division, Advanced Research Initiative for Human High Performance (ARIHHP), Institute of Health and Sport Sciences, University of Tsukuba, Tsukuba, Ibaraki, 305-8574, Japan. Electronic address:
Exercise benefits the brain, particularly the learning and memory center-the dorsal hippocampus (dHPC)-and holds promise for therapeutic applications addressing age-related cognitive deficits. While moderate-to-vigorous-intensity exercise is commonly recommended for health benefits, our translational research proposes the effectiveness of very-light-intensity exercise in enhancing cognitive functions. However, the intensity-dependent characteristics of HPC activation have yet to be fully delineated; therefore, there is no evidence of whether such easily accessible exercises for people of all ages and most fitness levels can activate HPC neurons.
View Article and Find Full Text PDFEnvironmental drivers of stream metabolism in a middle TN headwater stream.
PLoS One
December 2024
Department of Earth and Environmental Sciences, Vanderbilt University, Nashville, Tennessee, United States of America.
Monitoring the seasonal and diurnal variations in headwater stream metabolic regimes can provide critical information for understanding how ecosystems will respond to future environmental changes. In East Fork Creek, a headwater stream in middle Tennessee, week-long field campaigns were set up each month from May 2022 to May 2023 to collect stream metabolism estimators. In a more extensive field campaign from July 2-5 in 2022, diel signals were observed for temperature, pH, turbidity, and concentrations of Ca, Mg, K, Se, Fe, Ba, chloride, nitrate, DIC, DO, DOC, and total algae.
View Article and Find Full Text PDFUsing a full-wave theory to analyze the light beam scattering at sharp interfaces, we reexamine the anomalous spin-orbit interaction (SOI) around the Fresnel coefficient (FC) singularities. We evaluate the spin-dependent beam shifts near the singularity for three typical optical interfaces, comparing our results with existing ones. Existing theories neglect the contribution of the wave vector component near the FC singularities, potentially leading to erroneous results.
View Article and Find Full Text PDFCoupling Modelling and Experiments to Analyse Leaf Photosynthesis Under Far-Red Light.
Plant Cell Environ
December 2024
Copernicus Institute for Sustainable Development, Utrecht University, Utrecht, Netherlands.
Leaf photosynthesis models are used extensively in photosynthesis research and are embedded in many larger scale models. Typical photosynthesis models simplify light intensity as the integrated intensity over the 400-700 nm waveband (photosynthetic active radiation, PAR). However, far-red light (700-750 nm, FR) also drives photosynthesis when supplied in addition to light within the PAR spectrum.
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