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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Fabón, Gabriel Martínez-Abaigar, Javier Tomás, Rafael Núñez-Olivera, Encarnación |
| Description | Country affiliation: Spain Author Affiliation: Fabón G ( Complejo Científico-Tecnológico, Universidad de La Rioja, Avda. Madre de Dios 51, 26006 Logroño (La Rioja), Spain.) |
| Abstract | 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. |
| File Format | HTM / HTML |
| ISSN | 00319317 |
| Issue Number | 3 |
| Journal | Physiologia Plantarum |
| Volume Number | 140 |
| e-ISSN | 13993054 |
| Language | English |
| Publisher | Wiley |
| Publisher Date | 2010-11-01 |
| Publisher Place | Denmark |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Discipline Botany Coumaric Acids Analysis Hepatophyta Chemistry Radiation Effects Ultraviolet Rays Photosynthesis Journal Article Research Support, Non-u.s. Gov't |
| Content Type | Text |
| Resource Type | Article |
| Subject | Cell Biology Genetics Physiology Plant Science Medicine |
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