A drought stress-induced MYB transcription factor regulates pavement cell shape in leaves of European aspen (Populus tremula) Visa övriga samt affilieringar
2026 (Engelska) Ingår i: New Phytologist, ISSN 0028-646X, E-ISSN 1469-8137, Vol. 251, nr 5, s. 2688-2705Artikel i tidskrift (Refereegranskat) Published
Abstract [en]
Leaf pavement cells of many plant species develop jigsaw puzzle-like shapes in which neighboring cells interdigitate, providing an ideal model for the study of cell shape regulation. Such shapes are likely to reduce tissue-wide mechanical stress, which is influenced by environmental conditions, such as drought stress. We analyzed pavement cell shape complexity in a natural population of European aspen (Populus tremula) genotypes and used a genome-wide association study (GWAS) to identify a candidate gene in cell shape regulation, Potra2n8c18226, encoding the transcription factor MYB305a. We subsequently validated a role for MYB305a in regulating aspen leaf pavement cell shape. We then demonstrated that drought stress strongly induces MYB305a promoter expression in these cells and provided evidence that MYB305a plays a role in regulating pavement cell shape in response to drought. Finally, we observed correlations of pavement cell shape complexity with water-use efficiency and average precipitation at the original sampling sites, in the natural aspen population. Taken together, our results suggest climatic variables affect shape complexity of pavement cells in aspen leaf and provide a foundation for future mechanistic studies on this process, by implicating the involvement of the transcription factor MY305a. Ort, förlag, år, upplaga, sidor John Wiley & Sons, 2026. Vol. 251, nr 5, s. 2688-2705
Nyckelord [en]
cell shape, drought, European aspen (Populus tremula), GWAS, leaf pavement cells
Nationell ämneskategori
Botanik
Identifikatorer URN: urn:nbn:se:umu:diva-256747 DOI: 10.1111/nph.71399 ISI: 001810955300001 PubMedID: 42402693 Scopus ID: 2-s2.0-105043728469 OAI: oai:DiVA.org:umu-256747 DiVA, id: diva2:2087110
Forskningsfinansiär Vetenskapsrådet, VR-2020-03420 Kempestiftelserna, JCK-1732 Kempestiftelserna, JCK-1912 Knut och Alice Wallenbergs Stiftelse Vinnova EU, Europeiska forskningsrådet, ERC-2024-SyG STARMORPH 101166880 2026-07-172026-07-172026-09-09 Bibliografiskt granskad