Scientists Find Candidate Gene for Improving Potassium Deficiency Tolerance in Rice
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-CysPrxB, OsPRX2, 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.