title: Maintenance or collapse: responses of extraplastidic membrane lipid composition to desiccation in the resurrection plant Paraisometrum mileense.
abstract: Resurrection plants usually grow in specific or extreme habitats and have the capacity to survive almost complete water loss. We characterized the physiological and biochemical responses of Paraisometrum mileense to extreme desiccation and found that it is a resurrection plant. We profiled the changes in lipid molecular species during dehydration and rehydration in P. mileense, and compared these with corresponding changes in the desiccation-sensitive plant Arabidopsis thaliana. One day of desiccation was lethal for A. thaliana but not for P. mileense. After desiccation and subsequent rewatering, A. thaliana showed dramatic lipid degradation accompanied by large increases in levels of phosphatidic acid (PA) and diacylglycerol (DAG). In contrast, desiccation and rewatering of P. mileense significantly decreased the level of monogalactosyldiacylglycerol and increased the unsaturation of membrane lipids, without changing the level of extraplastidic lipids. Lethal desiccation in P. mileense caused massive lipid degradation, whereas the PA content remained at a low level similar to that of fresh leaves. Neither damage nor repair processes, nor increases in PA, occurred during non-lethal desiccation in P. mileense. The activity of phospholipase D, the main source of PA, was much lower in P. mileense than in A. thaliana under control conditions, or after either dehydration or rehydration. It was demonstrated that low rates of phospholipase D-mediated PA formation in P. mileense might limit its ability to degrade lipids to PA, thereby maintaining membrane integrity following desiccation.
authors: Plant Germplasm and Genomics Center, Germplasm Bank of Wild Species, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, China; University of Chinese Academy of Sciences, Beijing, China.
authors: Aihua
authors: A
authors: Li
authors: Plant Germplasm and Genomics Center, Germplasm Bank of Wild Species, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, China.
authors: Dandan
authors: D
authors: Wang
authors: Plant Germplasm and Genomics Center, Germplasm Bank of Wild Species, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, China.
authors: Buzhu
authors: B
authors: Yu
authors: Plant Germplasm and Genomics Center, Germplasm Bank of Wild Species, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, China.
authors: Xiaomei
authors: X
authors: Yu
authors: Key Laboratory of Biodiversity and Biogeography, Kunming Institute of Botany, Chinese Academy of Science, Kunming, China; Plant Germplasm and Genomics Center, Germplasm Bank of Wild Species, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, China.
authors: Weiqi
authors: W
authors: Li
mesh_terms: D017360:Arabidopsis / Q000737:chemistry / Q000378:metabolism / Q000502:physiology; D002734:Chlorophyll / Q000378:metabolism; D032181:Craterostigma / Q000737:chemistry* / Q000378:metabolism / Q000502:physiology; D003681:Dehydration; D003890:Desiccation / Q000379:methods*; D004075:Diglycerides / Q000032:analysis; D008315:Malondialdehyde / Q000378:metabolism; D008563:Membrane Lipids / Q000032:analysis* / Q000378:metabolism; D010712:Phosphatidic Acids / Q000032:analysis; D010739:Phospholipase D / Q000378:metabolism; D018515:Plant Leaves / Q000737:chemistry / Q000378:metabolism / Q000502:physiology; D011392:Proline / Q000378:metabolism; D013045:Species Specificity; D013312:Stress, Physiological; D013395:Sucrose / Q000378:metabolism; D013997:Time Factors; D014867:Water / Q000378:metabolism
chemical_list: D004075:Diglycerides; D008563:Membrane Lipids; D010712:Phosphatidic Acids; D014867:Water; D002734:Chlorophyll; D008315:Malondialdehyde; D013395:Sucrose; D011392:Proline; D010739:Phospholipase D