Non-Photochemical Quenching under Drought and Fluctuating Light.

Publisher: MDPI Country of Publication: Switzerland NLM ID: 101092791 Publication Model: Electronic Cited Medium: Internet ISSN: 1422-0067 (Electronic) Linking ISSN: 14220067 NLM ISO Abbreviation: Int J Mol Sci Subsets: MEDLINE

Original Publication: Basel, Switzerland : MDPI, [2000-

Arabidopsis*/metabolism; Droughts ; Light ; Light-Harvesting Protein Complexes/metabolism ; Photosynthesis ; Photosystem II Protein Complex/metabolism ; Water/metabolism ; Zeaxanthins/metabolism

Plants grow in a variable environment in regard to soil water and light driving photochemical reactions. Light energy exceeding plant capability to use it for photochemical reactions must be dissipated by processes of non-photochemical quenching (NPQ). The aim of the study was to evaluate the impact of various components of NPQ on the response of Arabidopsis thaliana to fluctuating light and water availability. A laboratory experiment with Arabidopsis thaliana wild type (WT) and mutants npq1 and npq4 grown under optimum or reduced water availability was conducted. Dark-adapted plants were illuminated with fluctuating light (FL) of two intensities (55 and 530 μmol m ^-2 s ^-1 ) with each of the phases lasting for 20 s. The impact of water availability on the role of zeaxanthin and PsbS protein in NPQ induced at FL was analysed. The water deficit affected the dynamics of NPQ induced by FL. The lack of zeaxanthin or PsbS reduced plant capability to cope with FL. The synergy of both of these components was enhanced in regard to the amplitude of NPQ in the drought conditions. PsbS was shown as a component of primary importance in suiting plant response to FL under optimum and reduced water availability.

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DWD/3/51/2019 Ministry of Science and Higher Education

Keywords: Arabidopsis thaliana; NPQ; PsbS; RWC; dissipation of excessive energy; non-photochemical quenching; variable light; water deficit; xanthophyll cycle

0 (Light-Harvesting Protein Complexes)
0 (Photosystem II Protein Complex)
0 (Zeaxanthins)
059QF0KO0R (Water)

Date Created: 20220514 Date Completed: 20220517 Latest Revision: 20220716

20221213

PMC9105319

10.3390/ijms23095182

35563573