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标题：Continuous UV-B Irradiation Induces Morphological Changes and the Accumulation of Polyphenolic Compounds on the Surface of Cucumber Cotyledons
其他标题：Continuous UV-B Irradiation Induces Morphological Changes and the Accumulation of Polyphenolic Compounds on the Surface of Cucumber Cotyledons
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作者：Seiji YAMASAKI ; Naoto NOGUCHI ; Kotaro MIMAKI 等
期刊名称：Journal of Radiation Research
印刷版ISSN：0449-3060
电子版ISSN：1349-9157
出版年度：2007
卷号：48
期号：6
页码：443-454
DOI：10.1269/jrr.07046
摘要：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.
关键词：Cucumber;Lignin;Polyphenolic compounds;Trichome;UV-B