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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Gerotto, Caterina Alboresi, Alessandro Giacometti, Giorgio M. Bassi, Roberto Morosinotto, Tomas |
| Description | Country affiliation: Italy Author Affiliation: Gerotto C ( Dipartimento di Biologia, Università di Padova, Padova, Italy.) |
| Abstract | Although light is the source of energy for photosynthetic organisms, it causes oxidative stress when in excess. Plants and algae prevent reactive oxygen species (ROS) formation by activation of nonphotochemical quenching (NPQ), which dissipates excess excitation energy as heat. Although NPQ is found in both algae and plants, these organisms rely on two different proteins for its activation, Light harvesting complex stress-related (LHCSR) and Photosystem II subunit S (PSBS). In the moss Physcomitrella patens, both proteins are present and active. Several P. patens lines depleted in or over-expressing PSBS and/or LHCSR at various levels were generated by exploiting the ability of Physcomitrella to undergo homologous recombination. The analysis of the transgenic lines showed that either protein is sufficient, alone, for NPQ activation independently of the other, supporting the idea that they rely on different activation mechanisms. Modulation of PSBS and/or LHCSR contents was found to be correlated with NPQ amplitude, indicating that plants and algae can directly modulate their ability to dissipate energy simply by altering the accumulation level of one or both of these proteins. The availability of a large range of P. patens genotypes differing in PSBS and LHCSR content allowed comparison of their activation mechanisms and discussion of implications for the evolution of photoprotection during land colonization. |
| File Format | HTM / HTML |
| ISSN | 0028646X |
| Issue Number | 3 |
| Volume Number | 196 |
| e-ISSN | 14698137 |
| Journal | New Phytologist |
| Language | English |
| Publisher | Wiley |
| Publisher Date | 2012-11-01 |
| Publisher Place | Great Britain (UK) |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Discipline Botany Bryopsida Metabolism Energy Metabolism Gene Expression Regulation, Plant Photosystem Ii Protein Complex Blotting, Western Genetics Radiation Effects Culture Media Gene Knockout Techniques Genotype Homologous Recombination Light Light-harvesting Protein Complexes Photosynthesis Plant Proteins Plants, Genetically Modified Protoplasts Species Specificity Transformation, Genetic Xanthophylls Zeaxanthins Journal Article Research Support, Non-u.s. Gov't |
| Content Type | Text |
| Resource Type | Article |
| Subject | Physiology Plant Science |
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