Coexistence of plant and algal energy dissipation mechanisms in the moss Physcomitrella patens.

The New Phytologist
Caterina GerottoTomas Morosinotto

Abstract

Although light is the source of energy for photosynthetic organisms, it causes oxidative stress when in excess. Plants and algae prevent reactive oxygen species (ROS) formation by activation of nonphotochemical quenching (NPQ), which dissipates excess excitation energy as heat. Although NPQ is found in both algae and plants, these organisms rely on two different proteins for its activation, Light harvesting complex stress-related (LHCSR) and Photosystem II subunit S (PSBS). In the moss Physcomitrella patens, both proteins are present and active. Several P. patens lines depleted in or over-expressing PSBS and/or LHCSR at various levels were generated by exploiting the ability of Physcomitrella to undergo homologous recombination. The analysis of the transgenic lines showed that either protein is sufficient, alone, for NPQ activation independently of the other, supporting the idea that they rely on different activation mechanisms. Modulation of PSBS and/or LHCSR contents was found to be correlated with NPQ amplitude, indicating that plants and algae can directly modulate their ability to dissipate energy simply by altering the accumulation level of one or both of these proteins. The availability of a large range of P. patens geno...Continue Reading

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Citations

Apr 16, 2013·Current Opinion in Plant Biology·Krishna K Niyogi, Thuy B Truong
Oct 30, 2016·Proceedings of the National Academy of Sciences of the United States of America·Caterina GerottoTomas Morosinotto
May 6, 2020·The New Phytologist·Mattia StortiTomas Morosinotto
Aug 17, 2019·Frontiers in Plant Science·Jun LiuRobert L Last
Nov 22, 2016·Frontiers in Plant Science·Igor FesenkoVadim M Govorun
Aug 30, 2018·Biochemical Society Transactions·Vasco Giovagnetti, Alexander V Ruban
Jan 11, 2020·Journal of Experimental Botany·Janine M R Fürst-JansenJan de Vries

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