PSB33 protein sustains photosystem II in plant chloroplasts under UV-A light

0540151 - ÚEB 2021 RIV GB eng J - Journal Article
Nilsson, A. K. - Pěnčík, Aleš - Johansson, O. - Bånkestad, D. - Fristedt, R. - Suorsa, M. - Trotta, A. - Novák, Ondřej - Mamedov, F. - Aro, E. M. - Burmeister, B. L.
PSB33 protein sustains photosystem II in plant chloroplasts under UV-A light.
Journal of Experimental Botany. Roč. 71, č. 22 (2020), s. 7210-7223. ISSN 0022-0957. E-ISSN 1460-2431
R&D Projects: GA MŠMT(CZ) EF16_019/0000827
Institutional support: RVO:61389030
Keywords : Arabidopsis * blue light * photoinhibition * photosystem II * state transition * thylakoid membrane * UV light
OECD category: Biochemistry and molecular biology
Impact factor: 6.992, year: 2020
Method of publishing: Open access
http://doi.org/10.1093/jxb/eraa427

Plants can quickly and dynamically respond to spectral and intensity variations of the incident light. These responses include activation of developmental processes, morphological changes, and photosynthetic acclimation that ensure optimal energy conversion and minimal photoinhibition. Plant adaptation and acclimation to environmental changes have been extensively studied, but many details surrounding these processes remain elusive. The photosystem II (PSII)-associated protein PSB33 plays a fundamental role in sustaining PSII as well as in the regulation of the light antenna in fluctuating light. We investigated how PSB33 knock-out Arabidopsis plants perform under different light qualities. psb33 plants displayed a reduction of 88% of total fresh weight compared to wild type plants when cultivated at the boundary of UV-A and blue light. The sensitivity towards UV-A light was associated with a lower abundance of PSII proteins, which reduces psb33 plants' capacity for photosynthesis. The UV-A phenotype was found to be linked to altered phytohormone status and changed thylakoid ultrastructure. Our results collectively show that PSB33 is involved in a UV-A light-mediated mechanism to maintain a functional PSII pool in the chloroplast.
Permanent Link: http://hdl.handle.net/11104/0317794