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Abstract
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.
Highlights
Whole-genome duplication, or polyploidy, is considered to be a driving force in plant evolution that enabled better adaptation to some adverse environmental conditions (Adams and Wendel, 2005; Parisod et al, 2010)
Two hypotheses include that non-selective cation channels in polyploid lines are formed of chimeric tetramers, with some subunits having modified thiol groups, 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
Genome duplication improved rice resistance to salt stress (Tu et al, 2014), and citrus tetraploid genotypes are more tolerant of moderate saline stress than diploids (Saleh et al, 2008; Mouhaya et al, 2010).The link between ploidy level and salinity tolerance seems to be reciprocal, with the recent report by Barkla et al (2018) showing that salt treatment led to a significant increase in ploidy levels in the epidermal bladder cells of the halophyte Mesembryanthemum crystallinum
Summary
Whole-genome duplication, or polyploidy, is considered to be a driving force in plant evolution that enabled better adaptation to some adverse environmental conditions (Adams and Wendel, 2005; Parisod et al, 2010). 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.
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