| Effects of enhanced UV-B radiation on hydroxycinnamic acid derivatives extracted from different cell compartments in the aquatic liverwort Jungermannia exsertifolia subsp. cordifolia. | |
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MedLine Citation:
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PMID: 20663084 Owner: NLM Status: In-Process |
Abstract/OtherAbstract:
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We examined the responses of ultraviolet-absorbing compounds (UVAC) to enhanced UV-B radiation in the aquatic liverwort Jungermannia exsertifolia subsp. cordifolia for 31 days under laboratory conditions. Samples were exposed to three radiation regimes: P (only photosynthetic radiation), PA (photosynthetic + UV-A radiation) and PAB (photosynthetic + UV-A + UV-B radiation). We measured both the bulk UV absorbance of the methanolic extracts and the levels of individual UVAC. In both cases, the methanol-soluble and the methanol-insoluble, alkali-extractable cell wall-bound fractions were analyzed. The bulk UV absorbance of the soluble fraction was higher than that of the cell wall-bound fraction. The bulk UV absorbances of both fractions increased under enhanced UV-B (PAB regime). Five different hydroxycinnamic acid (HCA) derivatives were found in the soluble fraction and two additional ones in the cell wall-bound fraction, among which only p-coumaroylmalic acid in the soluble fraction and p-coumaric acid in the cell wall-bound fraction increased under enhanced UV-B. The maximum quantum yield of PSII (F(v) /F(m)) decreased and DNA damage (amount of thymine dimers) strongly increased under enhanced UV-B, showing UV-B-induced damage. We conclude that methanol-soluble and cell wall-bound fractions of the liverwort studied have different UVAC, and each individual compound may respond in a different way to UV-B radiation. Thus, the analysis of individual UVAC in both the methanol-soluble and cell wall-bound fractions is advisable to better evaluate the protection mechanisms of liverworts against UV-B radiation. In particular, p-coumaric acid and p-coumaroylmalic acid seem to be especially UV-B responsive and merit further investigation. |
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Authors:
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Gabriel Fabón; Javier Martínez-Abaigar; Rafael Tomás; Encarnación Núñez-Olivera |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2010-08-04 |
Journal Detail:
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Title: Physiologia plantarum Volume: 140 ISSN: 1399-3054 ISO Abbreviation: Physiol Plant Publication Date: 2010 Nov |
Date Detail:
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Created Date: 2010-11-02 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 1256322 Medline TA: Physiol Plant Country: Denmark |
Other Details:
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Languages: eng Pagination: 269-79 Citation Subset: IM |
Copyright Information:
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Copyright © Physiologia Plantarum 2010. |
Affiliation:
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Complejo Científico-Tecnológico, Universidad de La Rioja, Avda. Madre de Dios 51, 26006 Logroño (La Rioja), Spain. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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