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Rice plants possess an internal oxygen transport system, and radial oxygen loss (ROL) from roots is closely associated with root development. However, the spatial patterns of ROL in soil and their relationships with root traits remain poorly characterized. In this study, we developed a multimodal imaging system that integrates planar oxygen optodes with X-ray computed tomography to simultaneously visualize rhizosphere oxidation and root development in rice. Daily time-course tracking of individual crown roots revealed dynamic changes in the spatial distribution and magnitude of rhizosphere oxygen in relation to root elongation and aging. Root thickness was positively correlated with dissolved oxygen levels near root tips. Genotypic comparisons further identified a cultivar with reduced rhizosphere oxidation despite possessing thicker roots among the tested genotypes, thereby indicating the involvement of additional physiological processes. Overall, these findings demonstrate that rhizosphere oxidation is regulated by root growth stage and thickness and dynamically modulated during root development.<\/jats:p>","DOI":"10.1093\/plphys\/kiag675","type":"journal-article","created":{"date-parts":[[2026,9,10]],"date-time":"2026-09-10T11:47:43Z","timestamp":1789040863000},"source":"Crossref","is-referenced-by-count":0,"title":["Characterization of rhizosphere oxidation associated with root development in rice using planar oxygen optodes"],"prefix":"10.1093","volume":"202","author":[{"ORCID":"https:\/\/orcid.org\/0009-0002-4045-9302","authenticated-orcid":false,"given":"Tsubasa","family":"Kawai","sequence":"first","affiliation":[{"name":"Institute of Crop Science (NICS), National Agriculture and Food Research Organization (NARO) , Tsukuba 305-8518 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