title: Dehydration-responsive features of Atrichum undulatum.
abstract: Drought is an increasingly important limitation on plant productivity worldwide. Understanding the mechanisms of drought tolerance in plants can lead to new strategies for developing drought-tolerant crops. Many moss species are able to survive desiccation-a more severe state of dehydration than drought. Research into the mechanisms and evolution of desiccation tolerance in basal land plants is of particular significance to both biology and agriculture. In this study, we conducted morphological, cytological, and physiological analyses of gametophytes of the highly desiccation-tolerant bryophyte Atrichum undulatum (Hedw.) P. Beauv during dehydration and rehydration. Our results suggested that the mechanisms underlying the dehydration-recovery cycle in A. undulatum gametophytes include maintenance of membrane stability, cellular structure protection, prevention of reactive oxygen species (ROS) generation, elimination of ROS, protection against ROS-induced damage, and repair of ROS-induced damage. Our data also indicate that this dehydration-recovery cycle consists not only of the physical removal and addition of water, but also involves a highly organized series of cytological, physiological, and biochemical changes. These attributes are similar to those reported for other drought- and desiccation-tolerant plant species. Our findings provide major insights into the mechanisms of dehydration-tolerance in the moss A. undulatum.
authors.affiliation: School of Life Sciences, Capital Normal University, Beijing, 100048, People's Republic of China.
authors.forename: Ruoyang
authors.initials: R
authors.lastname: Hu
authors.affiliation: Shanghai Center for Plant Stress Biology, Chinese Academy of Sciences, Shanghai, 201602, People's Republic of China.
authors.forename: Lihong
authors.initials: L
authors.lastname: Xiao
authors.affiliation: School of Life Sciences, Capital Normal University, Beijing, 100048, People's Republic of China.
authors.forename: Fang
authors.initials: F
authors.lastname: Bao
authors.affiliation: School of Life Sciences, Capital Normal University, Beijing, 100048, People's Republic of China. lxd61@126.com.
authors.forename: Xuedong
authors.initials: X
authors.lastname: Li
authors.affiliation: School of Life Sciences, Capital Normal University, Beijing, 100048, People's Republic of China. yhe@mail.cnu.edu.cn.
authors.forename: Yikun
authors.initials: Y
authors.lastname: He
mesh_terms: D044002:Bryophyta / Q000033:anatomy & histology / Q000166:cytology / Q000502:physiology* / Q000648:ultrastructure; D002734:Chlorophyll / Q000378:metabolism; D003681:Dehydration; D055864:Droughts; D005453:Fluorescence; D010641:Phenotype; D010788:Photosynthesis
chemical_list: D002734:Chlorophyll
keywords: Basal land plants; Biological responses; Desiccation tolerance; Modern agriculture; Polytrichales; Ultrastructure