Continuous UV-B Irradiation Induces Morphological Changes and the Accumulation of Polyphenolic Compounds on the Surface of Cucumber Cotyledons
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概要
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Sharp-headed and globular-headed trichomes are found on the surface of cucumber (Cucumis sativus L.) cotyledons. Most sharp-headed trichomes consist of three cells. Toluidine blue O stains sharp-headed but not globular-headed trichomes. The effect of continuous ultraviolet-B (UV-B; 290-320 nm) irradiation on the surface of cucumber cotyledons was examined with respect to the two trichome types. Continuous UV-B irradiation induced cell division at or under the basal part of sharp-headed trichomes, resulting in an increase in the number of cell layers from three to six. In parallel, the area stained by toluidine blue O expanded to include epidermal cells surrounding sharp-headed trichomes. Regions of alkali-induced fluorescence due to the presence of polyphenolic compounds coincided with areas stained by toluidine blue O. In contrast, continuous UV-B irradiation did not cause morphological changes in globular-headed trichomes. Thus, continuous UV-B irradiation causes the accumulation of polyphenolic compounds in cucumber cotyledons and induces specific morphological changes in or around sharp-headed trichomes. UV-B exposure also increases lignin content in this tissue. Therefore, continuous UV-B irradiation may induce the specific accumulation of polyphenolic compounds, especially stress lignins, in and near sharp-headed trichomes.
- 2007-11-15
著者
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Noguchi Naoto
Lab. Of Plant Physiology Dep. Of Sci. Education Fac. Of Education Fukuoka Univ. Of Education
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Noguchi Naoto
Laboratory Of Plant Physiology Department Of Science Education Faculty Of Education Fukuoka Universi
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Yamasaki Seiji
Lab. Of Plant Physiology Dep. Of Sci. Education Fac. Of Education Fukuoka Univ. Of Education
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Yamasaki Seiji
Laboratory Of Plant Breeding And Genetics Department Of Applied Plant Science Graduate School Of Agr
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MIMAKI Kotaro
Laboratory of Plant Physiology, Department of Science Education, Faculty of Education, Fukuoka Unive
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Mimaki Kotaro
Laboratory Of Plant Physiology Department Of Science Education Faculty Of Education Fukuoka Universi
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Yamasaki Seiji
Laboratory Of Microbiology And Infectious Diseases Institute Of Scientific And Industrial Research Osaka University
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