Plant Mol Biol (2017) 93:227–245 DOI 10.1007/s11103-016-0555-7 The protein phosphatase 2A catalytic subunit StPP2Ac2b acts as a positive regulator of tuberization induction in Solanum tuberosum L. 1 1 1 María Noelia Muñiz García · María Catalina Muro · Luciana Carla Mazzocchi · 1 1 1 Silvia Marina País · Margarita Stritzler · Mariana Schlesinger · Daniela Andrea Capiati Received: 28 April 2016 / Accepted: 27 October 2016 / Published online: 3 November 2016 © Springer Science+Business Media Dordrecht 2016 Abstract differences in the number of tubers obtained at the end of Key message This study provides the first genetic the process. This effect is accompanied by higher expres- evidence for the role of PP2A in tuberization, demon‑ sion levels of the gibberellic acid (GA) catabolic enzyme strating that the catalytic subunit StPP2Ac2b positively StGA2ox1. GA up-regulates StPP2Ac2b expression in modulates tuber induction, and that its function is stolons, possibly as part of the feedback system by which related to the regulation of gibberellic acid metabolism. the hormone regulates its own level. Sucrose, a tuber-pro- The results contribute to a better understanding of the moting factor in vitro, increases StPP2Ac2b expression. molecular mechanism controlling tuberization induc‑ We conclude that StPP2Ac2b acts in stolons as a positive tion, which remains largely unknown. regulator tuber induction, integrating different
Plant Molecular Biology – Springer Journals
Published: Nov 3, 2016
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