Linking ploidy level with salinity tolerance: NADPH-dependent 'ROS-Ca2+ hub' in the spotlight

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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.

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Shabala, S. (2019). Linking ploidy level with salinity tolerance: NADPH-dependent “ROS-Ca2+ hub” in the spotlight. Journal of Experimental Botany, 70(4), 1063–1067. https://doi.org/10.1093/jxb/erz042

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