Peroxiredoxins (Prxs) have been implicated in the toxic reduction and intracellular concentration regulation of hydrogen peroxide. In Arabidopsis thaliana, the At2-CysPrxB gene is essential in maintaining the water-water cycle for proper hydrogen peroxide scavenging.

 

While 2-Cys Prxs have been extensively studied in Arabidopsis thaliana, the function of 2-Cys Prxs in rice is unclear. Xiaohui Mao from Fujian Agriculture and Forestry University in China led a team of researchers to investigate the rice homologue of At2-CysPrxBOsPRX2, and its effect on Potassium deficiency tolerance in rice.

 

Analysis found that OsPRX2 was localized in the chloroplast. Overexpression of OsPRX2 caused enhanced potassium-deficiency tolerance, whereas CRISPR-knockout of OsPRX2 lead to serious defects in leaves and stomatal opening under the potassium- deficient conditions.

 

These results confirm the OsPRX2 is a potential target for engineering plants with improved tolerance to potassium deficiency.

 

For more information on this study, read the article in Biochemical and Biophysical Research Communications.