136440 - Linking ploidy level with salinity tolerance.pdf (1022.32 kB)
Linking ploidy level with salinity tolerance: NADPH-dependent 'ROS-Ca2+ hub' in the spotlight
Polyploidy is considered to be a driving force in plant evolution that enabled adaptation to adverse environmental conditions such as soil salinity. This phenomenon is examined by Liu et al. (2019) in relation to root-zone-specific ion transport, and can be explained by more efficient operation of an NADPH-dependent ‘ROS–Ca2+ hub’ and desensitization of ROS-inducible cation channels in polyploid lines. Two hypotheses include that non-selective cation channels in polyploid lines are formed of chimeric tetramers, with some subunits having modified thiol groups (hence, reduced sensitivity to H2O2), or alternatively that inactivation of Ca2+ channels and higher Ca2+-ATPase pump activity may reduce the level of cytosolic free Ca2+ and provide a negative control over NADPH oxidase operation.
History
Publication title
Journal of Experimental BotanyVolume
70Issue
4Pagination
1063-1067ISSN
0022-0957Department/School
Tasmanian Institute of Agriculture (TIA)Publisher
Oxford Univ PressPlace of publication
Great Clarendon St, Oxford, England, Ox2 6DpRights statement
© The Author(s) 2019. Licensed under Creative Commons Attribution 4.0 International (CC BY 4.0) http://creativecommons.org/licenses/by/4.0/Repository Status
- Open