An overview of mechanisms of desiccation tolerance in selected angiosperm resurrection plants
| dc.contributor.author | Farrant, Jill M | |
| dc.contributor.author | Brandt, Wolf B | |
| dc.contributor.author | Lindsey, George G | |
| dc.date.accessioned | 2016-07-28T11:42:05Z | |
| dc.date.available | 2016-07-28T11:42:05Z | |
| dc.date.issued | 2007 | |
| dc.date.updated | 2016-07-28T11:38:47Z | |
| dc.description.abstract | The vegetative tissues of resurrection plants, like seeds, can tolerate desiccation to 5% relative water content (RWC) for extended periods and yet resume full metabolic activity on re-watering. In this review we will illustrate how this is achieved in a variety of angiosperm resurrection plants, our studies ranging from the ecophysiological to the biochemical level. At the whole plant level, leaf folding and other anatomical changes serve to minimise light and mechanical stress associated with drying and rehydration. The mechanisms of cell wall folding are described for Craterostigma wilmsii and Myrothanmus flabellifolia. Free radicals, radical oxygen species (ROS) usually generated under water-deficit stress by photosynthesis, are minimised by either homoiochlorophylly (e.g. C. wilmsii and M. flabellifolia) or poikilochlorophylly (e.g. Xerophyta sp.). The antioxidant systems of these plants effectively deal with ROS generated by other metabolic processes. In addition to antioxidants common to most plants, resurrection plants also accumulate polyphenols such as 3, 4, 5 tri-O-galloylquinic acid in M. flabellifolia, and seed-associated antioxidants (e.g. 1-cys-peroxiredoxin and metallothionines) as effective ROS scavengers. Sucrose accumulates at low RWC, presumably protecting the sub-cellular milieu against desiccation-induced macromolecular denaturation. | en_ZA |
| dc.identifier.apacitation | Farrant, J. M., Brandt, W. B., & Lindsey, G. G. (2007). An overview of mechanisms of desiccation tolerance in selected angiosperm resurrection plants. <i>Plant Stress</i>, http://hdl.handle.net/11427/20938 | en_ZA |
| dc.identifier.chicagocitation | Farrant, Jill M, Wolf B Brandt, and George G Lindsey "An overview of mechanisms of desiccation tolerance in selected angiosperm resurrection plants." <i>Plant Stress</i> (2007) http://hdl.handle.net/11427/20938 | en_ZA |
| dc.identifier.citation | Farrant, J. M., Brandt, W., & Lindsey, G. G. (2007). An overview of mechanisms of desiccation tolerance in selected angiosperm resurrection plants. Plant Stress, 1(1), 72-84. | en_ZA |
| dc.identifier.issn | 1749-0359 | en_ZA |
| dc.identifier.ris | TY - Journal Article AU - Farrant, Jill M AU - Brandt, Wolf B AU - Lindsey, George G AB - The vegetative tissues of resurrection plants, like seeds, can tolerate desiccation to 5% relative water content (RWC) for extended periods and yet resume full metabolic activity on re-watering. In this review we will illustrate how this is achieved in a variety of angiosperm resurrection plants, our studies ranging from the ecophysiological to the biochemical level. At the whole plant level, leaf folding and other anatomical changes serve to minimise light and mechanical stress associated with drying and rehydration. The mechanisms of cell wall folding are described for Craterostigma wilmsii and Myrothanmus flabellifolia. Free radicals, radical oxygen species (ROS) usually generated under water-deficit stress by photosynthesis, are minimised by either homoiochlorophylly (e.g. C. wilmsii and M. flabellifolia) or poikilochlorophylly (e.g. Xerophyta sp.). The antioxidant systems of these plants effectively deal with ROS generated by other metabolic processes. In addition to antioxidants common to most plants, resurrection plants also accumulate polyphenols such as 3, 4, 5 tri-O-galloylquinic acid in M. flabellifolia, and seed-associated antioxidants (e.g. 1-cys-peroxiredoxin and metallothionines) as effective ROS scavengers. Sucrose accumulates at low RWC, presumably protecting the sub-cellular milieu against desiccation-induced macromolecular denaturation. DA - 2007 DB - OpenUCT DP - University of Cape Town J1 - Plant Stress LK - https://open.uct.ac.za PB - University of Cape Town PY - 2007 SM - 1749-0359 T1 - An overview of mechanisms of desiccation tolerance in selected angiosperm resurrection plants TI - An overview of mechanisms of desiccation tolerance in selected angiosperm resurrection plants UR - http://hdl.handle.net/11427/20938 ER - | en_ZA |
| dc.identifier.uri | http://hdl.handle.net/11427/20938 | |
| dc.identifier.vancouvercitation | Farrant JM, Brandt WB, Lindsey GG. An overview of mechanisms of desiccation tolerance in selected angiosperm resurrection plants. Plant Stress. 2007; http://hdl.handle.net/11427/20938. | en_ZA |
| dc.language | eng | en_ZA |
| dc.publisher | Global Science Books | en_ZA |
| dc.publisher.institution | University of Cape Town | |
| dc.source | Plant Stress | en_ZA |
| dc.source.uri | http://www.globalsciencebooks.info/Journals/PS.html | |
| dc.subject.other | Craterostigma | |
| dc.subject.other | Eragrostis | |
| dc.subject.other | Myrothamnus | |
| dc.subject.other | Xerophyta | |
| dc.title | An overview of mechanisms of desiccation tolerance in selected angiosperm resurrection plants | en_ZA |
| dc.type | Journal Article | en_ZA |
| uct.type.filetype | Text | |
| uct.type.filetype | Image | |
| uct.type.publication | Research | en_ZA |
| uct.type.resource | Article | en_ZA |