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<p>The serine/threonine protein phosphatase type 2A (PP2A) plays a pivotal role in several physiological processes in potato (<i>Solanum tuberosum</i>) plants. PP2A consists of three distinct subunits: a catalytic (C), a scaffolding (A), and a regulatory (B) subunit. While the PP2A C family has undergone extensive characterization in <i>S. tuberosum</i>, there is currently a lack of information about the A and B subunits in this species. In this study, 27 subunits of StPP2A were identified genome-wide, including six StPP2A-C genes, three StPP2A-A genes, four StPP2A-B genes, 11 StPP2A-B′ genes, and three StPP2A-B″ genes. The integration of in silico and experimental expression data has unveiled the regulatory significance of the B subunits in modulating the activity of the C-A dimers in response to salt and osmotic stress. Specifically, StPP2A-B′κ, StPP2A-B″α and StPP2A-B″β were identified as the regulatory subunits most likely to be involved in the acclimation response. Additionally, this study delved into the metabolic, biochemical, and molecular responses of potato plants overexpressing <i>StPP2A-C2b</i> when subjected to salt stress, osmotic stress, or abscisic acid (ABA) treatment. The findings underscore the role of PP2A in orchestrating stress signal transduction pathways in potato. By laying the foundation for future research, this study opens avenues for a deeper understanding of the functional roles of StPP2A genes, particularly in the context of acclimation to abiotic stressors.</p>

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Identification of PP2A B subunits potentially involved in modulating salt and osmotic stress responses in Solanum tuberosum

  • 期刊论文

  • 发表日期：

    2025年2月19日

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  • Martina Zubillaga,
  • Ignacio Yaconis,
  • Juan I. Cortelezzi,
  • Daniela A. Capiati,
  • María N. Muñiz García

摘要

The serine/threonine protein phosphatase type 2A (PP2A) plays a pivotal role in several physiological processes in potato (Solanum tuberosum) plants. PP2A consists of three distinct subunits: a catalytic (C), a scaffolding (A), and a regulatory (B) subunit. While the PP2A C family has undergone extensive characterization in S. tuberosum, there is currently a lack of information about the A and B subunits in this species. In this study, 27 subunits of StPP2A were identified genome-wide, including six StPP2A-C genes, three StPP2A-A genes, four StPP2A-B genes, 11 StPP2A-B′ genes, and three StPP2A-B″ genes. The integration of in silico and experimental expression data has unveiled the regulatory significance of the B subunits in modulating the activity of the C-A dimers in response to salt and osmotic stress. Specifically, StPP2A-B′κ, StPP2A-B″α and StPP2A-B″β were identified as the regulatory subunits most likely to be involved in the acclimation response. Additionally, this study delved into the metabolic, biochemical, and molecular responses of potato plants overexpressing StPP2A-C2b when subjected to salt stress, osmotic stress, or abscisic acid (ABA) treatment. The findings underscore the role of PP2A in orchestrating stress signal transduction pathways in potato. By laying the foundation for future research, this study opens avenues for a deeper understanding of the functional roles of StPP2A genes, particularly in the context of acclimation to abiotic stressors.