Rate My Professor Ari Pekka Mähönen

Ari Pekka Mähönen is Academy Professor in the Department of Organismal and Evolutionary Biology at the University of Helsinki, appointed by the Research Council of Finland for 2026–2031. He also holds the position of Professor in the same department and leads the Plant Growth Dynamics research group within the Faculty of Biological and Environmental Sciences. Mähönen earned his Master of Science in molecular biology in 1999 from the University of Kuopio and his Doctor of Philosophy in 2006 from the Institute of Biotechnology at the University of Helsinki, with a thesis on vascular development in Arabidopsis thaliana root under the supervision of Ykä Helariutta. He performed postdoctoral research from 2006 to 2009 in Ben Scheres' laboratory at Utrecht University, studying Arabidopsis root meristem growth dynamics and the PLETHORA stem cell factor gradient. Returning to Helsinki, he launched an independent research program on vascular cambium development. In 2011, he was appointed tenure-track group leader at the Institute of Biotechnology, advanced to HiLIFE tenure-track Associate Professor in 2019, and was tenured as Professor in 2022. He previously served as Professor of Plant Molecular Biology and Adjunct Professor in Plant Developmental and Molecular Biology since 2015.

Mähönen's research focuses on plant developmental biology and genetics, particularly the molecular regulation of vascular cambium development and wood production using the Arabidopsis root as a model. His group examines how phytohormones such as cytokinin and auxin control cell division, differentiation, stem cell maintenance, and radial growth in the cambium, which produces xylem for water transport, phloem for nutrients, and bark for protection. He developed an inducible gene editing system for precise analysis of gene functions in specific cells and times. Key publications include "Cytokinin signaling and its inhibitor AHP6 regulate cell fate during vascular development" (Science, 2006), "High levels of auxin signalling define the stem-cell organizer of the vascular cambium" (Nature, 2019), "Gibberellins promote polar auxin transport to regulate stem cell activity in cambium" (2023), and "Auxin transport positions stem cells in the vascular cambium during normal development and regeneration" (2025). Awards include the Scandinavian Plant Physiology Society Early Career Award (2015), election to the Finnish Academy of Science and Letters (2025), ERC Consolidator Grant (2019), and multiple doctoral thesis awards (2006). He supervises doctoral students in Plant Sciences and Integrative Life Science programs, serves on thesis committees, and edits research journals.