Sensory Perception of Fluctuating Light in Arabidopsis

Article Article scientifique Article Sensory Perception of Fluctuating Light in Arabidopsis eng 2025-05-27 2025-05-27 author Belmonte Antonela Fundación Instituto Leloir and IIBBA-CONICET. Av. Patricias Argentinas 435, Buenos Aires, Argentina. 933321 author Tissot Nicolas 0000-0003-3411-894X Department of Plant Sciences, Section of Biology, Faculty of Sciences, University of Geneva, Geneva, Switzerland.,Institute of Genetics and Genomics of Geneva (iGE3), University of Geneva, Geneva, Switzerland. 876502 author Rabinovich Andrés Fundación Instituto Leloir and IIBBA-CONICET. Av. Patricias Argentinas 435, Buenos Aires, Argentina. author Ploschuk Edmundo L. 0000-0002-1765-8816 Facultad de Agronomía, Cátedra de Cultivos Industriales, Universidad de Buenos Aires, Buenos Aires, Argentina. author Crocco Carlos 0000-0002-6026-4003 Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura (IFEVA), Facultad de Agronomía, Universidad de Buenos Aires, Buenos Aires, Argentina. 809387 author Ulm Roman 0000-0001-8014-7392 Department of Plant Sciences, Section of Biology, Faculty of Sciences, University of Geneva, Geneva, Switzerland.,Institute of Genetics and Genomics of Geneva (iGE3), University of Geneva, Geneva, Switzerland. 732804 Département des sciences végétales (BIVEG) author Casal Jorge J. 0000-0001-6525-8414 Fundación Instituto Leloir and IIBBA-CONICET. Av. Patricias Argentinas 435, Buenos Aires, Argentina.,Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura (IFEVA), Facultad de Agronomía, Universidad de Buenos Aires, Buenos Aires, Argentina. 1-17 15633 10.1111/pce.15633 40421713 0140-7791 When exposed to shade from neighbours, competitive plants modify their growth patterns to improve access to light. In dense plant stands, ranging from forests to humid grasslands and crops, shade is interrupted by sunflecks penetrating the canopy. Relatively infrequent, minute-scale interruptions can significantly contribute to the daily light input. However, given the short duration and the time gap between these low frequency sunflecks (LFS), whether plants can sense them was unknown. Here, we demonstrate that phytochrome B (phyB), cryptochrome 1 (cry1), cry2 and UV RESISTANCE LOCUS 8 (UVR8) cooperatively perceive LFS to reduce hypocotyl growth in Arabidopsis thaliana. LFS also enhanced the expression of photosynthetic and photo-protective genes and initiated pre-emptive acclimation to water restriction. Repeated LFS increased the nuclear abundance of cry1 and UVR8. This positive feedback enhanced the sensitivity to subsequent LFS and even to the shade between LFS. LFS reduced the nuclear abundance of the growth regulator PHYTOCHROME INTERACTING FACTOR 4 (PIF4), which only slowly recovered upon return to shade, further amplifying the signal. Our findings unveil hitherto uncharacterised dynamics of cry1, UVR8 and PIF4 under fluctuating light. This photosensory system helps adjust plants to the prevailing environmental conditions. Growth Light quality Light signalling Photoreceptors Shade Shade avoidance Signalling Sunflecks Dewey 590 Dewey 580 Argentinean‐Swiss Joint Research Programme of CONICET‐MINCyT‐SNSF IZSAZ3_173361 23 Institut de génétique et de génomique 0DH 45 Département des sciences végétales 163 false 832 Groupe Ulm Plant, cell & environment 897b3c9f-377e-4e47-a2b3-edbd265eb1e4 Article (Published version) Public Belmonte_PCE_2025_-_Sensory_Percept.pdf 5182206 application/pdf CC BY-NC-ND-4.0 72868cdf80919c7a3926ee185ff1ce8464c6d936294669ba983ccc1b19a2199c openAccess Centres et instituts / Institut de génétique et de génomique Faculté des sciences / Section de biologie / Département des sciences végétales

Title	Published in	Access level	OA Policy	Year	Views	Downloads

Sensory Perception of Fluctuating Light in Arabidopsis	Plant, cell & environment			2025	23	337

Archive ouverte UNIGE

Belmonte, Antonela