PSB33 protein sustains photosystem II in plant chloroplasts under UV-A light
Artikel i vetenskaplig tidskrift, 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

Göteborgs universitet

Ales Pencik

Univerzita Palackého v Olomouci

Oskar N. Johansson

Göteborgs universitet

Daniel Bankestad

Heliospectra AB

Rikard Fristedt

Chalmers, Biologi och bioteknik, Livsmedelsvetenskap

Marjaana Suorsa

Turun Yliopisto

Andrea Trotta

Turun Yliopisto

Ondrej Novak

Univerzita Palackého v Olomouci

Fikret Mamedov

Uppsala universitet

Eva-Mari Aro

Turun Yliopisto

Bjorn Lundin Burmeister

Göteborgs universitet

Journal of Experimental Botany

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

Vol. 71 22 7210-7223









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