https://orcid.org/0000-0002-4259-8296
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Magdalena M. Julkowska, Changing Gears in Salt Stress Tolerance: AtCAMTA6’s Role in Transcriptional Regulation of Ion Transport, Plant Physiology, Volume 180, Issue 2, June 2019, Pages 684–685, https://doi.org/10.1104/pp.19.00334
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Salt stress affects plant growth and development at all stages, reducing germination and compromising seedling establishment, transpiration, and root growth (Munns and Tester, 2008). At later developmental stages, the overaccumulation of salt ions in the shoot disrupts photosynthesis and other vital processes, oftentimes resulting in premature leaf senescence. The release of vacuolar Ca2+ into the cytosol occurs early after salt stress exposure and is essential for propagation of stress signals throughout the plant (Choi et al., 2014). One of the best characterized Ca2+ sensors within the plant cell is calmodulin (CaM; Virdi et al., 2015), which undergoes a conformational change upon Ca2+ binding, thereby changing its affinity for interacting proteins. CaM can affect general transcription levels either indirectly, through interactions with protein kinases, or directly, by interacting with transcription factors. Six CaM-binding transcriptional activators (CAMTAs) identified in Arabidopsis (Arabidopsis thaliana; Bouché et al., 2002) show induced transcription levels in response to biotic and abiotic stress (Yang and Poovaiah, 2002; Doherty et al., 2009; Pandey et al., 2013). CAMTAs have conserved protein structures, containing the CaM-binding IQ motifs toward the C terminus and DNA-binding domains at the N-terminal end (Finkler et al., 2007). Although the majority of the CAMTAs are well studied, the function of CAMTA6 remained elusive until recently.
