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Title: Expression level of the sodium transporter gene OsHKT2;1 determines sodium accumulation of rice cultivars under potassium-deficient conditions
Authors: Miyamoto, Takuji
Ochiai, Kumiko  kyouindb  KAKEN_id
Nonoue, Yasunori
Matsubara, Kazuki
Yano, Masahiro
Matoh, Toru
Author's alias: 落合, 久美子
Keywords: map-based cloning
Oryza sativa
Issue Date: 2015
Publisher: Informa UK Limited
Journal title: Soil Science and Plant Nutrition
Volume: 61
Issue: 3
Start page: 481
End page: 492
Abstract: Under potassium (K)-deficient conditions, rice (Oryza sativa L.) actively takes up and utilizes sodium (Na) as an alternative element to K. In this study, we cloned a gene responsible for cultivar differences in shoot Na accumulation using a map-based cloning method. The responsible gene OsHKT2;1 encodes an Na transporter associated with Na uptake in root tissues, and its expression level was positively correlated with Na uptake potential in 11 rice cultivars. We found that OsHKT2;1 overexpression promoted shoot Na accumulation under low K supply and proposed that OsHKT2;1 expression level is a key factor in the Na accumulation potential in rice cultivars. However, under sufficient K supply, OsHKT2;1-overexpressing rice plants accumulated Na in roots but not in shoots. This result suggests that Na transfer from root to shoot may be regulated by another Na transporter.
Rights: This is an Accepted Manuscript of an article published by Taylor & Francis in Soil Science and Plant Nutrition on 5 February 2015, available online:
This is not the published version. Please cite only the published version.
DOI(Published Version): 10.1080/00380768.2015.1005539
Appears in Collections:Journal Articles

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