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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Tovuu, Altanzaya Zulfugarov, Ismayil S. Lee, Choon-Hwan |
| Description | Author Affiliation: Tovuu A ( Department of Molecular Biology, Pusan National University, Busan, Korea.) |
| Abstract | To monitor changes in membrane fluidity in Arabidopsis leaves and thylakoid membranes, we investigated the temperature dependence of a chlorophyll fluorescence parameter, minimum fluorescence (Fo), and calculated the threshold temperature [T(Fo)] at which the rise of the fluorescence level Fo was considered to be started. For the modification of membrane fluidity we took three different approaches: (1) an examination of wild-type leaves initially cultured at room temperature (22°C), then exposed to either a lower (4°C) or higher (35°C) temperature for 5 days; (2) measurements of the shift in T(Fo) by two mutants deficient in fatty acid desaturase genes - fad7 and fad7fad8 and (3) an evaluation of the performance of wild-type plants when leaves were infiltrated with chemicals that modify fluidity. When wild-type plants were grown at 22°C, the T(Fo) was 48.3 ± 0.3°C. Plants that were then transferred to a chamber set at 4 or 35°C showed a shift in their T(Fo) to 42.7 ± 0.9°C or 48.9 ± 0.1°C, respectively. Under low-temperature acclimation, the decline in this putative transition temperature was significantly less in fad7 and fad7fad8 mutants compared with the wild-type. In both leaf and thylakoid samples, values for T(Fo) were reduced in samples treated with benzyl alcohol, a membrane fluidizer, whereas T(Fo) rose in samples treated with dimethylsulfoxide, a membrane rigidifier. These results indicate that the heat-induced rise of chlorophyll fluorescence is strongly correlated with the fluidity of thylakoid membranes. |
| File Format | HTM / HTML |
| ISSN | 00319317 |
| Issue Number | 4 |
| Volume Number | 147 |
| e-ISSN | 13993054 |
| Journal | Physiologia Plantarum |
| Language | English |
| Publisher | Wiley |
| Publisher Date | 2013-04-01 |
| Publisher Place | Denmark |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Discipline Botany Arabidopsis Physiology Chlorophyll Metabolism Membrane Fluidity Thylakoids Genetics Arabidopsis Proteins Fatty Acid Desaturases Fluorescence Mutation Plant Leaves Temperature 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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