PSB33 protein sustains photosystem II in plant chloroplasts under UV-A light
Journal article, 2020

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.

UV light

blue light

state transition

thylakoid membrane


photosystem II



Anders K. Nilsson

University of Gothenburg

Ales Pencik

Palacky University Olomouc

Oskar N. Johansson

University of Gothenburg

Daniel Bankestad

Heliospectra AB

Rikard Fristedt

Chalmers, Biology and Biological Engineering, Food and Nutrition Science

Marjaana Suorsa

University of Turku

Andrea Trotta

University of Turku

Ondrej Novak

Palacky University Olomouc

Fikret Mamedov

Uppsala University

Eva-Mari Aro

University of Turku

Bjorn Lundin Burmeister

University of Gothenburg

Journal of Experimental Botany

0022-0957 (ISSN) 1460-2431 (eISSN)

Vol. 71 22 7210-7223

Subject Categories


Plant Biotechnology






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