Light signals generated by vegetation shade facilitate acclimation to low light in shade-avoider plants
Martinez-Garcia, Jaime F.
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.
633 - Field crops and their production
American Society of Plant Biologists
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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.
Genòmica i Biotecnologia
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