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It is an important player in the reversible phosphorylation of proteins and involved in a wide variety of cellular processes, from signal transduction events to cell cycle regulation and a large number of metabolic processes. At the subcellular level, there is a comprehensive knowledge on PP2A-mediated regulation of chromatin and cytoskeletal organization and there is increasing evidence for its relevant functions in the organization of membrane compartments. Relatively little is known about the related regulatory functions of this enzyme complex in the responses of plants to abiotic stresses. However, recent research has revealed several aspects of these relationships at the subcellular level, mainly for osmotic\/salt and heat stress. PP2A is a family of three-subunit holoenzyme complexes, where \u201cA\u201d are scaffolding, \u201cB\u201d are regulatory and \u201cC\u201d are catalytic subunits. Here we discuss the involvement of all these subunits in the regulation of stress-related changes in chromatin, cytoskeleton (microtubule and microfilament), endomembrane (including ER) and plastid\/mitochondrial organization and emphasize how they sustain the functioning of plant cells under multiple abiotic stresses. There are crucial subunits in this respect, for example A1, C3 and C4 as well as \u201cB\u201d regulatory subunits such as FASS and members of the B and B\u2019 subfamilies. PP2A is involved in stress hormone (featuring ABA) signaling at multiple levels. In light of recent research, we show that different PP2A holoenzymes link together diverse stress-related signaling mechanisms.<\/jats:p>","DOI":"10.1007\/s00299-026-03931-5","type":"journal-article","created":{"date-parts":[[2026,8,20]],"date-time":"2026-08-20T01:42:14Z","timestamp":1787190134000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["A current view on the involvement of protein phosphatase PP2A subunits in the responses of plants to abiotic stress at the subcellular level"],"prefix":"10.1007","volume":"45","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-9322-7647","authenticated-orcid":false,"given":"Csaba","family":"M\u00e1th\u00e9","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"M\u00e1rta","family":"M-Hamvas","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tam\u00e1s","family":"Garda","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zolt\u00e1n","family":"K\u00f3nya","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2026,8,20]]},"reference":[{"key":"3931_CR1","doi-asserted-by":"publisher","first-page":"185","DOI":"10.1105\/tpc.110.074005","volume":"23","author":"CS Ahn","year":"2011","unstructured":"Ahn CS, Han J-A, Lee H-S, Lee S, Pai H-S (2011) The PP2A regulatory subunit Tap46, a component of the TOR signaling pathway, modulates growth and metabolism in plants. 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