In:
Scientific Reports, Springer Science and Business Media LLC, Vol. 7, No. 1 ( 2017-05-25)
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 + and Na + transporter genes, such as OsHAK1 , OsHAK5 , OsAKT1 , and OsHKT2;1 were significantly down-regulated in lcs1 grown at low K + /Na + . The decreased Cs + uptake in lcs1 might be closely related to the lower expression of these genes due to the K + /Na + imbalance in the lcs1 roots caused by the OsSOS2 mutation. Since the lcs1 plant had no significant negative effects on agronomic traits when grown in radiocesium-contaminated paddy fields, this mutant could be used directly in agriculture for reducing radiocesium in rice grains.
Type of Medium:
Online Resource
ISSN:
2045-2322
DOI:
10.1038/s41598-017-02243-9
Language:
English
Publisher:
Springer Science and Business Media LLC
Publication Date:
2017
detail.hit.zdb_id:
2615211-3
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