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Article

A Genetic Screen to Identify New Molecular Players Involved in Photoprotection qH in Arabidopsis thaliana

Umeå Plant Science Centre, Department of Plant Physiology, Umeå University, 901 87 Umeå, Sweden
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Author to whom correspondence should be addressed.
Plants 2020, 9(11), 1565; https://doi.org/10.3390/plants9111565
Received: 1 October 2020 / Revised: 30 October 2020 / Accepted: 11 November 2020 / Published: 13 November 2020
Photosynthesis is a biological process which converts light energy into chemical energy that is used in the Calvin–Benson cycle to produce organic compounds. An excess of light can induce damage to the photosynthetic machinery. Therefore, plants have evolved photoprotective mechanisms such as non-photochemical quenching (NPQ). To focus molecular insights on slowly relaxing NPQ processes in Arabidopsis thaliana, previously, a qE-deficient line—the PsbS mutant—was mutagenized and a mutant with high and slowly relaxing NPQ was isolated. The mutated gene was named suppressor of quenching 1, or SOQ1, to describe its function. Indeed, when present, SOQ1 negatively regulates or suppresses a form of antenna NPQ that is slow to relax and is photoprotective. We have now termed this component qH and identified the plastid lipocalin, LCNP, as the effector for this energy dissipation mode to occur. Recently, we found that the relaxation of qH1, ROQH1, protein is required to turn off qH. The aim of this study is to identify new molecular players involved in photoprotection qH by a whole genome sequencing approach of chemically mutagenized Arabidopsis thaliana. We conducted an EMS-mutagenesis on the soq1 npq4 double mutant and used chlorophyll fluorescence imaging to screen for suppressors and enhancers of qH. Out of 22,000 mutagenized plants screened, the molecular players cited above were found using a mapping-by-sequencing approach. Here, we describe the phenotypic characterization of the other mutants isolated from this genetic screen and an additional 8000 plants screened. We have classified them in several classes based on their fluorescence parameters, NPQ kinetics, and pigment content. A high-throughput whole genome sequencing approach on 65 mutants will identify the causal mutations thanks to allelic mutations from having reached saturation of the genetic screen. The candidate genes could be involved in the formation or maintenance of quenching sites for qH, in the regulation of qH at the transcriptional level, or be part of the quenching site itself. View Full-Text
Keywords: photoprotection; non-photochemical quenching qH; Arabidopsis thaliana; forward genetics; whole genome sequencing photoprotection; non-photochemical quenching qH; Arabidopsis thaliana; forward genetics; whole genome sequencing
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MDPI and ACS Style

Bru, P.; Nanda, S.; Malnoë, A. A Genetic Screen to Identify New Molecular Players Involved in Photoprotection qH in Arabidopsis thaliana. Plants 2020, 9, 1565. https://doi.org/10.3390/plants9111565

AMA Style

Bru P, Nanda S, Malnoë A. A Genetic Screen to Identify New Molecular Players Involved in Photoprotection qH in Arabidopsis thaliana. Plants. 2020; 9(11):1565. https://doi.org/10.3390/plants9111565

Chicago/Turabian Style

Bru, Pierrick, Sanchali Nanda, and Alizée Malnoë. 2020. "A Genetic Screen to Identify New Molecular Players Involved in Photoprotection qH in Arabidopsis thaliana" Plants 9, no. 11: 1565. https://doi.org/10.3390/plants9111565

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