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Reversible photoinactivation of photosystem II during desiccation of barley (Hordeum vulgare L. cv. Albori) leaves in the light
| Content Provider | Semantic Scholar |
|---|---|
| Author | Hwang, Jin Rhew, Tae Hyong |
| Copyright Year | 2009 |
| Abstract | We investigated the inherent protective mechanisms against stress and damage to photosystem II (PSII) in barley (Hordeum vulgare L. cv. Albori). Leaves were desiccated at 30% relative humidity, under either low or high light (photon flux densities of 100 or 300 μmol m-2 s-1, respectively). During the treatment period, relative water content dropped to 35 to 45%, depending on light intensity. However, the photochemical efficiency of PSII (Fv/Fm) decreased only about 10%. This relatively stable response was due to the rapid, reversible increase in Fm (maximum fluorescence) during 20 min of dark-adaptation. During desiccation in the light, however, PSII was photo-inactivated by non-photochemical quenching (NPQ), with the excess excitation energy absorbed by the chlorophyll being dissipated as heat energy. This decline in NPQ in the first 2 min of treatment was caused by a relaxation in the energy-dependent quenching during dark-adaptation, but could be delayed significantly by a phosphatase inhibitor, NaF. In addition, the relaxation of other NPQ components related to state transition and phosphorylation of thylakoid phosphoproteins were blocked by NaF. |
| Starting Page | 142 |
| Ending Page | 148 |
| Page Count | 7 |
| File Format | PDF HTM / HTML |
| DOI | 10.1007/BF03030645 |
| Volume Number | 47 |
| Alternate Webpage(s) | https://page-one.springer.com/pdf/preview/10.1007/BF03030645 |
| Alternate Webpage(s) | https://doi.org/10.1007/BF03030645 |
| Journal | Journal of Plant Biology |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
