75 - 92 % of its fresh weight
||Mueller SJ, Hoernstein SN, Reski R. The mitochondrial proteome of the moss Physcomitrella patens. Mitochondrion. 2017 Mar33: 38-44. doi: 10.1016/j.mito.2016.07.007 p.39 left column 2nd paragraphPubMed ID27450107
||Cui S et al., Proteome analysis of Physcomitrella patens exposed to progressive dehydration and rehydration. J Exp Bot. 2012 Jan63(2):711-26. doi: 10.1093/jxb/err296 AND Frank W, Ratnadewi D, Reski R. Physcomitrella patens is highly tolerant against drought, salt and osmotic stress. Planta. 2005 Jan220(3):384-94. DOI: 10.1007/s00425-004-1351-1PubMed ID21994173, 15322883
||Primary source Cui et al. abstract: "A comprehensive proteomic analysis of dehydration- and rehydration-responsive proteins has been conducted using quantitative two-dimensional difference in-gel electrophoresis (2D-DIGE), and traditional 2-D gel electrophoresis (2-DE) combined with MALDI TOF/TOF MS." Primary source Frank et al., abstract: "In order to determine the degree of tolerance of the moss Physcomitrella patens to different abiotic stress conditions, [investigators] examined its tolerance against salt, osmotic and dehydration stress." MALDI=Matrix-assisted laser desorption/ionization. TOFMS=Time-of-flight mass spectrometry
||P.39 left column 2nd paragraph: "Mosses are basal land plants with a wide distribution in different habitats. Their different survival mechanisms are partly still enigmatic compared to vascular plants. Most tissues of Physcomitrella patens are single cell layers or filaments, which are poikilohydric (i.e. equilibrate with the humidity of the environment), yet this moss is more resistant to several abiotic stresses such as salt stress and dehydration than most vascular plants (Mishler and Oliver, 2009, Oliver et al., 2005). Thus, P. patens can recover from a water loss of up to 75–92% of its fresh weight (primary sources), a dehydration tolerance that can be further increased by treatment with the plant stress hormone ABA [Abscisic acid](Khandelwal et al., 2010, Koster et al., 2010). Under these adverse conditions, the protection of membrane integrity and the limitation and repair of damage caused by reactive oxygen species (ROS) are likely among the main issues in mitochondria (Koster et al., 2010, Møller, 2001, Schwarzländer and Finkemeier, 2013), similar to the situation in mature seeds (Wang et al., 2015)."