Low-cesium rice: mutation in OsSOS2 reduces radiocesium in rice grains.

ABSTRACT: In Japan, radiocesium contamination in foods has become of great concern and it is a primary issue to reduce grain radiocesium concentration in rice (Oryza sativa L.). Here, we report a low-cesium rice mutant 1 (lcs1) with the radiocesium concentration in grain about half that in the wild-type cultivar. Genetic analyses revealed that a mutation in OsSOS2, which encodes a serine/threonine-protein kinase required for the salt overly sensitive (SOS) pathway in plants, is responsible for the decreased cesium (Cs) concentrations in lcs1. Physiological analyses showed that Cs⁺ uptake by lcs1 roots was significantly decreased under low-potassium (K⁺) conditions in the presence of sodium (Na⁺) (low K⁺/Na⁺). The transcript levels of several K

SUBMITTER: Ishikawa S 

PROVIDER: S-EPMC5445092 | biostudies-literature | 2017 May

REPOSITORIES: biostudies-literature