A role for the OsHKT 2;1 sodium transporter in potassium use efficiency in rice.

Thomas Noel Hartley, Alice Sarah Thomas, Franciscus Johannes Maria Maathuis

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Increasing the potassium use efficiency (KUE) of crops is important for agricultural sus3 tainability. However, a greater understanding of this complex trait is required to develop new, high KUE cultivars. To this end, a genome-wide association study (GWAS) was applied to diverse rice (Oryza sativa L.) genotypes grown under potassium stressed and replete conditions. Using high stringency criteria, the genetic architecture of KUE was uncovered, together with the breadth of physiological responses to low-potassium stress. Specifically, 3 quantitative trait loci (QTLs) were identified, which contained over 90 candidate genes. Of these, the sodium transporter gene OsHKT2;1 emerged as a key factor that impacts on KUE based on (i) the correlation between shoot Na+ and KUE, and (ii) higher levels of HKT2;1 expression in high KUE lines.
Original languageEnglish
Early online date11 Mar 2019
Publication statusE-pub ahead of print - 11 Mar 2019

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© Society for Experimental Biology 2019. This is an author-produced version of the published paper. Uploaded in accordance with the publisher’s self-archiving policy. Further copying may not be permitted; contact the publisher for details.

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