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Subunits B′ γ and B′ ζ of protein phosphatase 2A regulate photo‐oxidative stress responses and growth in A rabidopsis thaliana
Author(s) -
Konert Grzegorz,
Rahikainen Moona,
Trotta Andrea,
Durian Guido,
Salojärvi Jarkko,
Khorobrykh Sergey,
Tyystjärvi Esa,
Kangasjärvi Saijaliisa
Publication year - 2015
Publication title -
plant, cell and environment
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.646
H-Index - 200
eISSN - 1365-3040
pISSN - 0140-7791
DOI - 10.1111/pce.12575
Subject(s) - protein phosphatase 2 , biology , arabidopsis thaliana , microbiology and biotechnology , arabidopsis , oxidative stress , reactive oxygen species , protein subunit , phosphatase , catalase , mutant , biochemistry , phosphorylation , gene
Plants survive periods of unfavourable conditions with the help of sensory mechanisms that respond to reactive oxygen species (ROS) as signalling molecules in different cellular compartments. We have previously demonstrated that protein phosphatase 2A (PP2A) impacts on organellar cross‐talk and associated pathogenesis responses in A rabidopsis thaliana . This was evidenced by drastically enhanced pathogenesis responses and cell death in cat2 pp2a‐b′γ double mutants, deficient in the main peroxisomal antioxidant enzyme CATALASE 2 and PP2A regulatory subunit B′ γ (PP2A‐B′ γ ). In the present paper, we explored the impacts of PP2A‐B′ γ and a highly similar regulatory subunit PP2A‐B′ ζ in growth regulation and light stress tolerance in Arabidopsis . PP2A ‐ B ′γ and PP2A ‐ B ′ζ display high promoter activities in rapidly growing tissues and are required for optimal growth under favourable conditions. Upon acclimation to a combination of high light, elevated temperature and reduced availability of water, however, pp2a‐b′γζ double mutants grow similarly to the wild type and show enhanced tolerance against photo‐oxidative stress. We conclude that by controlling ROS homeostasis and signalling, PP2A‐B′ γ and PP2A‐B′ ζ may direct acclimation strategies upon environmental perturbations, hence acting as important determinants of defence responses and light acclimation in plants.