Singlet oxygen triggers chloroplast rupture and cell death in the zeaxanthin epoxidase defective mutant aba1 of Arabidopsis thaliana under high light stress

Autor: Sergio González-Pérez, Inmaculada Sánchez-Vicente, Ascensión Corrales, Álvaro Sánchez-Corrionero, Juan B. Arellano, Oscar Lorenzo, Anja Krieger-Liszkay
Přispěvatelé: Ministerio de Economía y Competitividad (España), Junta de Castilla y León, Institut de Biologie Intégrative de la Cellule (I2BC), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Mécanismes régulateurs chez les organismes photosynthétiques (MROP), Département Biochimie, Biophysique et Biologie Structurale (B3S), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Institut de Biologie Intégrative de la Cellule (I2BC), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)
Rok vydání: 2017
Předmět:
Zdroj: GREDOS. Repositorio Institucional de la Universidad de Salamanca
instname
Journal of Plant Physiology
Journal of Plant Physiology, 2017, 216, pp.188--196. ⟨10.1016/j.jplph.2017.06.009⟩
GREDOS: Repositorio Institucional de la Universidad de Salamanca
Universidad de Salamanca (USAL)
Digital.CSIC. Repositorio Institucional del CSIC
ISSN: 0176-1617
Popis: 44 páginas, 6 figuras, 1 tabla. -- The definitive version is available at http://www.elsevier.com
The two Arabidopsis thaliana mutants, aba1 and max4, were previously identified as sharing a number of co-regulated genes with both the flu mutant and Arabidopsis cell suspension cultures exposed to high light (HL). On this basis, we investigated whether aba1 and max4 were generating high amounts of singlet oxygen (1O2) and activating 1O2-mediated cell death. Thylakoids of aba1 produced twice as much 1O2 as thylakoids of max4 and wild type (WT) plants when illuminated with strong red light. 1O2 was measured using the spin probe 2,2,6,6-tetramethyl-4-piperidone hydrochloride. 77-K chlorophyll fluorescence emission spectra of thylakoids revealed lower aggregation of the light harvesting complex II in aba1. This was rationalized as a loss of connectivity between photosystem II (PSII) units and as the main cause for the high yield of 1O2 generation in aba1. Up-regulation of the 1O2 responsive gene AAA-ATPase was only observed with statistical significant in aba1 under HL. Two early jasmonate (JA)-responsive genes, JAZ1 and JAZ5, encoding for two repressor proteins involved in the negative feedback regulation of JA signalling, were not up-regulated to the WT plant levels. Chloroplast aggregation followed by chloroplast rupture and eventual cell death was observed by confocal imaging of the fluorescence emission of leaf cells of transgenic aba1 plants expressing the chimeric fusion protein SSU-GFP. Cell death was not associated with direct 1O2 cytotoxicity in aba1, but rather with a delayed stress response. In contrast, max4 did not show evidence of 1O2-mediated cell death. In conclusion, aba1 may serve as an alternative model to other 1O2-overproducing mutants of Arabidopsis for investigating 1O2-mediated cell death.
This work was supported by MINECO (AGL2013-41363-R, ERDF) and Junta de Castilla y León (CSI002A10-2 and CSI083U16, ERDF) to J.B.A., ERC.KBBE.2012.1.1-01 (EcoSeed-311840) to Ó.L and A. K.-L., and MINECO (BIO2014-57107-R) and Junta de Castilla y León (SA239U13 and SA093U16) to Ó.L.
Databáze: OpenAIRE
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