UNIGE document Scientific Article
previous document  unige:91314  next document
add to browser collection
Title

UV-B photoreceptor-mediated protection of the photosynthetic machinery in Chlamydomonas reinhardtii

Authors
Kuntz, Marcel
Truong, Thuy B
Niyogi, Krishna K
Published in Proceedings of the National Academy of Sciences. 2016, vol. 113, no. 51, p. 14864-14869
Abstract Life on earth is dependent on the photosynthetic conversion of light energy into chemical energy. However, absorption of excess sunlight can damage the photosynthetic machinery and limit photosynthetic activity, thereby affecting growth and productivity. Photosynthetic light harvesting can be down-regulated by nonphotochemical quenching (NPQ). A major component of NPQ is qE (energy-dependent nonphotochemical quenching), which allows dissipation of light energy as heat. Photodamage peaks in the UV-B part of the spectrum, but whether and how UV-B induces qE are unknown. Plants are responsive to UV-B via the UVR8 photoreceptor. Here, we report in the green alga Chlamydomonas reinhardtii that UVR8 induces accumulation of specific members of the light-harvesting complex (LHC) superfamily that contribute to qE, in particular LHC Stress-Related 1 (LHCSR1) and Photosystem II Subunit S (PSBS). The capacity for qE is strongly induced by UV-B, although the patterns of qE-related proteins accumulating in response to UV-B or to high light are clearly different. The competence for qE induced by acclimation to UV-B markedly contributes to photoprotection upon subsequent exposure to high light. Our study reveals an anterograde link between photoreceptor-mediated signaling in the nucleocytosolic compartment and the photoprotective regulation of photosynthetic activity in the chloroplast.
Identifiers
PMID: 27930292
Full text
Article (Published version) (1.8 MB) - document accessible for UNIGE members only Limited access to UNIGE
Other version: http://www.pnas.org/content/113/51/14864.long
Structures
Research groups Groupe Ulm
Groupe Goldschmidt-Clermont
Projects FNS: 31003A_153475 and 31003A_146300
FP7: UV-B PERCEPTION
Citation
(ISO format)
ALLORENT, Guillaume et al. UV-B photoreceptor-mediated protection of the photosynthetic machinery in Chlamydomonas reinhardtii. In: Proceedings of the National Academy of Sciences, 2016, vol. 113, n° 51, p. 14864-14869. https://archive-ouverte.unige.ch/unige:91314

70 hits

0 download

Update

Deposited on : 2017-01-25

Export document
Format :
Citation style :