Silicon isotopic fractionation under water stress in Sorghum bicolor: evidence from in situ morphotype-specific phytolith analysis

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• dc.contributor.author D'Agostini, Francesca
• dc.contributor.author Frick, Daniel A.
• dc.contributor.author Varalli, Alessandra
• dc.contributor.author Ruiz-Giralt, Abel
• dc.contributor.author Madella, Marco
• dc.contributor.author Lancelotti, Carla
• dc.date.accessioned 2025-09-23T14:40:36Z
• dc.date.available 2025-09-23T14:40:36Z
• dc.date.issued 2025
• dc.date.updated 2025-09-23T14:40:36Z
• dc.description Data de publicació electrònica: 27 de juny de 2025
• dc.description.abstract Background and Aims Phytolith studies are still facing numerous challenges regarding the available notions of Si absorption from soil and its deposition in aerial organs. This study shows how plant water availability affects the biosilica content and silicon isotopic composition of phytoliths in sorghum (Sorghum bicolor). Methods Phytoliths were extracted from different plant parts of crops grown experimentally in lysimeters under water stress (WS) and well-watered (WW) conditions and analysed for silicon isotopic composition using femtosecond laser ablation multi-collector inductively coupled plasma-mass spectrometry (fsLA-MC-ICP-MS). This method provided precise isotope ratios of individual phytolith morphotypes. Results Results indicate that while Si isotopic composition largely reflects watering conditions, single morphotypes present major differences with Bulliform phytoliths demonstrating superior predictive capability for water availability. The distinct Si isotopic signatures observed in Bulliform, Elongate, and Stoma suggest that variations in Si fractionation among morphotypes could be linked to differences in Si absorption and deposition processes, likely mediated by water stress. Conclusions Our findings align with prior research suggesting that water stress affects Si uptake, potentially altering the Si-water movement relationship. The significant variability in the isotopic data measured indicates the potential involvement of additional environmental, and consequently physiological factors influencing silicon isotope composition in phytoliths, especially Bulliform, which we suggest should be the focus of future research. Our model offers a solid foundation for research in several fields, from agronomic studies aimed at using Si to improve drought-resistance, to palaeoenvironmental and archaeological studies aimed at reconstructing past climate change and human¿environment interactions.
• dc.format.mimetype application/pdf
• dc.identifier.citation D'Agostini F, Frick DA, Varalli A, Ruiz-Giralt A, Madella M, Lancelotti C. Silicon isotopic fractionation under water stress in Sorghum bicolor: evidence from in situ morphotype-specific phytolith analysis. Plant and soil. 2025. 20 p. DOI: 10.1007/s11104-025-07633-x
• dc.identifier.doi https://dx.doi.org/10.1007/s11104-025-07633-x
• dc.identifier.issn 0032-079X
• dc.identifier.uri http://hdl.handle.net/10230/71261
• dc.language.iso eng
• dc.publisher Nature Research
• dc.relation.ispartof Plant and soil. 2025. 20 p.
• dc.rights This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article¿s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article¿s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.
• dc.rights.accessRights info:eu-repo/semantics/openAccess
• dc.rights.uri http://creativecommons.org/licenses/by/4.0/
• dc.subject.keyword Phytoliths
• dc.subject.keyword Si isotope
• dc.subject.keyword FsLA-MCICP-MS
• dc.subject.keyword Sorghum
• dc.subject.keyword Water stress
• dc.title Silicon isotopic fractionation under water stress in Sorghum bicolor: evidence from in situ morphotype-specific phytolith analysis
• dc.type info:eu-repo/semantics/article
• dc.type.version info:eu-repo/semantics/publishedVersion