Abstract
SOS5 locus, encodes cell wall adhesion protein under salt stress conditions in plants, and it is required for normal cell expansion as well as for sustaining cell wall integrity and structure. However, it is still unknown how this gene locus-ABA cross-talk and interacts with the antioxidant mechanism under salt stress conditions. For this purpose, the study focused on mutant sos5-1 plant treated with ABA under NaCl stress and observed its growth and development as well as stomatal aperture, lipid peroxidation, proline, hydrogen peroxide (H2O2) and ABA contents, and some antioxidant enzyme activities. In addition, the expression levels of ABA related genes have been analysed by RT-PCR after stress application. According to findings, sos5-1 mutant plants treated with ABA under salt stress resulted in eliminated cellular damage compared to those which are solely exposed to salt stress; other observations include closing of stomata, decreased H2O2 content, increased amount of proline, and similarity with the wild type due to induced antioxidant enzyme activities. Besides, both ABA biosynthetic and inducible gene expressions of the mutant plant under salt stress were lower compared to the control, and catabolism gene expression was higher. As a result, SOS5 gene in synergy with ABA, scavenge the ROS by stimulating antioxidant system, leads to an increase in stress related gene expressions and thus contributes to salinity tolerance. This study is significant in the way that it shows how SOS5 gene locus, under salt stress conditions, interacts with antioxidant system in sustaining cell wall integrity.
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Acknowledgements
We many thanks to Dr. Georg Seifert (University of Natural Resources and Life Science, Vienna, Austria) for all helps (I started to work on sos5 in his lab) especially supply seeds and for technical assistance with a confocal laser microscope photograph.
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Acet, T., Kadıoğlu, A. SOS5 gene-abscisic acid crosstalk and their interaction with antioxidant system in Arabidopsis thaliana under salt stress. Physiol Mol Biol Plants 26, 1831–1845 (2020). https://doi.org/10.1007/s12298-020-00873-4
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DOI: https://doi.org/10.1007/s12298-020-00873-4