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oai:recercat.cat:20.500.12327/14102025-10-22T11:29:22Zcom_2072_4428com_2072_4427col_2072_487898

Light signals generated by vegetation shade facilitate acclimation to low light in shade-avoider plants Morelli, Luca Paulišić, Sandi Qin, Wenting Iglesias-Sanchez, Ariadna Roig-Villanova, Irma Florez-Sarasa, Igor Rodriguez-Concepcion, Manuel Martinez-Garcia, Jaime F. Producció Vegetal Genòmica i Biotecnologia 633 When growing in search for light, plants can experience continuous or occasional shading by other plants. Plant proximity causes a decrease in the ratio of R to far-red light (low R:FR) due to the preferential absorbance of R light and reflection of FR light by photosynthetic tissues of neighboring plants. This signal is often perceived before actual shading causes a reduction in photosynthetically active radiation (low PAR). Here, we investigated how several Brassicaceae species from different habitats respond to low R:FR and low PAR in terms of elongation, photosynthesis, and photoacclimation. Shade-tolerant plants such as hairy bittercress (Cardamine hirsuta) displayed a good adaptation to low PAR but a poor or null response to low R:FR exposure. In contrast, shade-avoider species, such as Arabidopsis (Arabidopsis thaliana), showed a weak photosynthetic performance under low PAR but they strongly elongated when exposed to low R:FR. These responses could be genetically uncoupled. Most interestingly, exposure to low R:FR of shade-avoider (but not shade-tolerant) plants improved their photoacclimation to low PAR by triggering changes in photosynthesis-related gene expression, pigment accumulation, and chloroplast ultrastructure. These results indicate that low R:FR signaling unleashes molecular, metabolic, and developmental responses that allow shade-avoider plants (including most crops) to adjust their photosynthetic capacity in anticipation of eventual shading by nearby plants. info:eu-repo/semantics/acceptedVersion 2021-05-07 info:eu-repo/semantics/article Morelli, Luca, Sandi Paulišić, Wenting Qin, Ariadna Iglesias-Sanchez, Irma Roig-Villanova, Igor Florez-Sarasa, Manuel Rodriguez-Concepcion, and Jaime F Martinez-Garcia. 2021. "Light Signals Generated By Vegetation Shade Facilitate Acclimation To Low Light In Shade-Avoider Plants". Plant Physiology 186 (4): 2137-2151. doi:10.1093/plphys/kiab206. 0032-0889 http://hdl.handle.net/20.500.12327/1410 https://doi.org/10.1093/plphys/kiab206 eng Plant Physiology Copyright © 2020 American Society of Plant Biologists. All rights reserved info:eu-repo/semantics/openAccess 1 American Society of Plant Biologists