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Sunfleck perception and responses

English title Sunfleck perception and responses
Applicant Ulm Roman
Number 173361
Funding scheme Argentina (AJRP)
Research institution Département de Biologie Végétale Faculté des Sciences Université de Genève
Institution of higher education University of Geneva - GE
Main discipline Botany
Start/End 01.10.2017 - 30.09.2020
Approved amount 249'912.00
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All Disciplines (2)

Discipline
Botany
Genetics

Keywords (4)

UV-B photoreceptor; Arabidopsis thaliana; sunflecks; photomorphogenesis

Lay Summary (German)

Lead
Waldpflanzen sowie Pflanzen in dichten landwirtschaftlichen Anbausystemen sind einer hochdynamischen Lichtumgebung ausgesetzt. Dieses Projekt soll zu einem besseren molekularen Verständnis der Erkennung von and Antwort auf Sonnenflecken („sunflecks“) in der Modelpflanze Arabidopsis thaliana (Ackerschmalwand) führen.
Lay summary
Waldpflanzen sowie Pflanzen in dichten landwirtschaftlichen Anbausystemen sind einer hochdynamischen Lichtumgebung ausgesetzt. Teile dieser Pflanzen sind während des Tages grösstenteils stark beschattet, werden aber oft plötzlich für kurze Zeit starkem Sonnenlicht ausgesetzt. Diese sogenannten Sonnenflecken („sunflecks“) haben einen grossen Einfluss auf die Photosynthese in schattigen Lebensräumen. Jedoch verstehen wir auf molekularer Basis sehr schlecht, wie Pflanzenorgane Sonnenflecken erkennen und wie sie darauf reagieren. Es ist vor allem auch nicht gut untersucht, wie Pflanzen auf die plötzliche Bestrahlung mit potentiell schädigender Ultraviolett-B Strahlung (UV-B) reagieren. Neben verschiedenen Photorezeptoren für sichtbares Licht, haben Pflanzen auch einen spezifischen Rezeptor zur Detektion von UV-B und Regulation von UV-B Akklimatisierungsprozessen, welche zu erhöhter UV-B Toleranz führen. Das Ziel dieses internationalen Kollaborations-Projektes ist ein besseres Verständnis der molekularen Mechanismen der Perzeption von Sonnenflecken durch Pflanzen und der Funktion des UV-B Photorezeptors UVR8 in diesem Prozess.
Direct link to Lay Summary Last update: 03.08.2017

Responsible applicant and co-applicants

Employees

Name Institute

Publications

Publication
Cryptochrome-mediated blue-light signalling modulates UVR8 photoreceptor activity and contributes to UV-B tolerance in Arabidopsis
Tissot Nicolas, Ulm Roman (2020), Cryptochrome-mediated blue-light signalling modulates UVR8 photoreceptor activity and contributes to UV-B tolerance in Arabidopsis, in Nature Communications, 11(1), 1323-1323.
Photoreceptor-mediated regulation of the COP1/SPA E3 ubiquitin ligase
Podolec Roman, Ulm Roman (2018), Photoreceptor-mediated regulation of the COP1/SPA E3 ubiquitin ligase, in Current Opinion in Plant Biology, 45, 18-25.
Perception of Sunflecks by the UV-B Photoreceptor UV RESISTANCE LOCUS8.
Moriconi Victoria, Binkert Melanie, Costigliolo Cecilia, Sellaro Romina, Ulm Roman, Casal Jorge J (2018), Perception of Sunflecks by the UV-B Photoreceptor UV RESISTANCE LOCUS8., in Plant physiology, 177(1), 75-81.
Coping with ‘Dark Sides of the Sun’ through Photoreceptor Signaling
Demarsy Emilie, Goldschmidt-Clermont Michel, Ulm Roman (2018), Coping with ‘Dark Sides of the Sun’ through Photoreceptor Signaling, in Trends in Plant Science, 23(3), 260-271.

Collaboration

Group / person Country
Types of collaboration
Jorge Casal, University of Buenos Aires Argentina (South America)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Research Infrastructure
- Exchange of personnel

Scientific events

Active participation

Title Type of contribution Title of article or contribution Date Place Persons involved
UV4Plants 3rd Network / 1st virtual Meeting Talk given at a conference Blue light regulation on UV-B signalling in Arabidopsis 13.10.2020 Kiel, Germany Tissot Nicolas;
Current Challenges in Plant Biology 2019 Talk given at a conference Photoreceptors and signalling (old and new perspectives 09.12.2019 University of Helsinki, Finland Ulm Roman;
2019 ESP-IUPB World Congress: LIGHT & LIFE Talk given at a conference Cross-regulation between UV-B and visible light signalling in Arabidopsis 25.08.2019 Barcelona, Spain Tissot Nicolas;
International Symposium on Plant Photobiology (ISPP2019) Talk given at a conference Cryptochrome-mediated RUP1 and RUP2 induction modulates UVR8 photoreceptor activity 04.06.2019 Barcelona, Spain Ulm Roman;


Associated projects

Number Title Start Funding scheme
154438 Signal Integration in Plants: UV-B, Shade and Biotic Stress 01.10.2014 Sinergia
175774 Perception and signalling of UV-B radiation in plants 01.07.2018 Project funding
153475 Perception and signalling of UV-B radiation in plants 01.12.2014 Project funding

Abstract

Forest understory plants, as well as lower plant parts in high-density agricultural cropping systems, experience a highly dynamic light environment. These plants, or parts of them, are heavily shaded during most of the day, but are suddenly exposed to strong sunlight for brief and often predictable periods. These so-called sunflecks are short, intermittent periods of high photon flux density that strongly contribute to photosynthesis in shaded habitats. Thus, sunflecks are ecophysiologically and agriculturally highly important as source of energy for carbon gain; however, a molecular understanding of how plant organs perceive and respond to sunflecks is scarce. In particular, how plants cope with the sudden exposure to potentially damaging ultraviolet-B radiation (UV-B) intrinsic to sunflecks has not been investigated yet. Next to the visible light photoreceptors, plants contain a specific UV-B photoreceptor UVR8 that regulates many UV-B responses in plants and that contributes to establish UV-B acclimation and stress tolerance. The overall aim of this joint research project is to investigate the molecular mechanisms involved in the perception of natural sunflecks by plants and the function of UVR8 in this process.
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