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However, there are few studies on the effects of 222\u00a0nm UVC (222-UVC) radiation exposure on plants compared with the effects of germicidal lamps emitting primarily 254\u00a0nm UVC (254-UVC) radiation. We investigated the growth inhibition and cell damage caused by 222-UVC exposure to <jats:italic>Arabidopsis<\/jats:italic> plants, especially mitochondrial dynamics, which is an index of damage caused by UVB radiation. Growth inhibition resulted from 254-UVC or 222-UVC exposure depending on the dose of UVC radiation. However, with respect to the phenotype of 222-UVC-irradiated plants, the leaves curled under 1\u00a0kJ\u00a0m<jats:sup>\u22122<\/jats:sup> and were markedly bleached under 10\u00a0kJ\u00a0m<jats:sup>\u22122<\/jats:sup> compared with those of plants irradiated with 254-UVC. The cellular state, especially the mitochondrial dynamics, of epidermal and mesophyll cells of <jats:italic>Arabidopsis<\/jats:italic> leaves exposed to 254-UVC or 222-UVC radiation was investigated using <jats:italic>Arabidopsis<\/jats:italic> plants expressing mitochondrial matrix-targeted yellow fluorescent protein (MT-YFP) under the control of Pro35S to visualize the mitochondria. 222-UVC (1 or 5\u00a0kJ\u00a0m<jats:sup>\u22122<\/jats:sup>) severely damaged the guard cells within the epidermis, and YFP signals and chloroplast autofluorescence in guard cells within the epidermis exposed to 222-UVC (1 or 5\u00a0kJ\u00a0m<jats:sup>\u22122<\/jats:sup>) were not detected compared with those in cells exposed to 254-UVC radiation. In addition, 222-UVC irradiation led to mitochondrial fragmentation in mesophyll cells, similar to the effects of 254-UVC exposure. These results suggest that 222-UVC severely damages guard cells and epidermal cells and that such damage might have resulted in growth inhibition.<\/jats:p>","DOI":"10.1007\/s43630-021-00123-w","type":"journal-article","created":{"date-parts":[[2021,11,3]],"date-time":"2021-11-03T19:02:52Z","timestamp":1635966172000},"page":"1675-1683","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":28,"title":["222\u00a0nm ultraviolet radiation C causes more severe damage to guard cells and epidermal cells of Arabidopsis plants than does 254\u00a0nm ultraviolet radiation"],"prefix":"10.1007","volume":"20","author":[{"given":"Momo","family":"Otake","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kaoru","family":"Okamoto Yoshiyama","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hiroko","family":"Yamaguchi","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3798-8257","authenticated-orcid":false,"given":"Jun","family":"Hidema","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2021,11,3]]},"reference":[{"key":"123_CR1","doi-asserted-by":"publisher","first-page":"770","DOI":"10.1111\/php.12093","volume":"89","author":"D Sliney","year":"2013","unstructured":"Sliney, D. 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