Plants reorient their growth towards light to optimize photosynthetic light capture--a process known as phototropism. Phototropins are the photoreceptors essential for phototropic growth towards blue and ultraviolet-A (UV-A) light. Here we detail a phototropic response towards UV-B in etiolated Arabidopsis seedlings. We report that early differential growth is mediated by phototropins but clear phototropic bending to UV-B is maintained in phot1 phot2 double mutants. We further show that this phototropin-independent phototropic response to UV-B requires the UV-B photoreceptor UVR8. Broad UV-B-mediated repression of auxin-responsive genes suggests that UVR8 regulates directional bending by affecting auxin signaling. Kinetic analysis shows that UVR8-dependent directional bending occurs later than the phototropin response. We conclude that plants may use the full short-wavelength spectrum of sunlight to efficiently reorient photosynthetic tissue with incoming light.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1093/mp/ssu039 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
The influence of UV radiation on the properties of GFRP laminates in underwater conditions.
Sci Rep
March 2024
Faculty of Materials Engineering, Silesian University of Technology, Krasińskiego 8 Street, 40-019, Katowice, Poland.
Degradation of polymer composites is a significant problem in many engineering aspects. Due to the interaction of various degradation factors during the exploitation of composites, a synergistic effect of destruction is observed. The article describes the phenomena occurring in glass fiber reinforced polyester laminates under the influence of ultraviolet radiation (UV) in an aquatic environment.
View Article and Find Full Text PDFSupplementary UV-A and UV-B radiation differentially regulate morphology in Ocimum basilicum.
Photochem Photobiol Sci
September 2023
Örebro Life Science Center, School of Science and Technology, Örebro University, 70182, Örebro, Sweden.
UV-A- or UV-B-enriched growth light was given to basil plants at non-stress-inducing intensities. UV-A-enriched growth light gave rise to a sharp rise in the expression of PAL and CHS genes in leaves, an effect that rapidly declined after 1-2 days of exposure. On the other hand, leaves of plants grown in UV-B-enriched light had a more stable and long-lasting increase in the expression of these genes and also showed a stronger increase in leaf epidermal flavonol content.
View Article and Find Full Text PDFEffects and Mechanism of Enhanced UV-B Radiation on the Flag Leaf Angle of Rice.
Int J Mol Sci
October 2022
College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China.
Leaf angle is an influential agricultural trait that influences rice ( L.) plant type and yield, which results from the leaf bending from the vertical axis to the abaxial axis. UV-B radiation affects plant morphology, but the effects of varying UV-B intensities on rice flag leaves and the underlying molecular, cellular, and physiological mechanisms remain unknown.
View Article and Find Full Text PDFCryptochromes are the dominant photoreceptors mediating heliotropic responses of Arabidopsis inflorescences.
Plant Cell Environ
October 2021
Instituto de Investigaciones Forestales y Agropecuarias Bariloche (Instituto Nacional de Tecnología Agropecuaria-Consejo Nacional de Investigaciones Científicas y Técnicas), San Carlos de Bariloche, Rio Negro, Argentina.
Inflorescence movements in response to natural gradients of sunlight are frequently observed in the plant kingdom and are suggested to contribute to reproductive success. Although the physiological and molecular bases of light-mediated tropisms in vegetative organs have been thoroughly investigated, the mechanisms that control inflorescence orientation in response to light gradients under natural conditions are not well understood. In this work, we have used a combination of laboratory and field experiments to investigate light-mediated re-orientation of Arabidopsis thaliana inflorescences.
View Article and Find Full Text PDFActin filaments altered distribution in wheat (Triticum aestivum) "Bending Root" to respond to enhanced Ultraviolet-B radiation.
Braz J Biol
February 2021
Shanxi Normal University, Higher Education Key Laboratory of Plant Molecular and Environment Stress Response, Linfen, Shanxi, China.
Plants adjust their shoot growth to acclimate to changing environmental factors, such as to enhanced Ultraviolet-B (UV-B) radiation. However, people have ignored that plant roots can also respond to UV-B light. Here, we find the morphology curled wheat roots under UV-B radiation, that we call, "bending roots.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!