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\begin{document}

\title{Effects of improved sodium uptake ability on grain yields of rice plants
under low potassium supply}



\author[1]{Kumiko Ochiai}%
\author[1]{Kousuke Oba}%
\author[1]{Kanoko Oda}%
\author[1]{Takuji Miyamoto}%
\author[1]{Toru Matoh}%
\affil[1]{Kyoto University}%


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  \date{May 25, 2024}


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\begin{abstract}
Sodium uptake is a factor that determines potassium use efficiency in
plants as sodium can partially replace potassium in plant cells. Rice
(\emph{Oryza sativa}) roots usually exclude sodium but actively take it
up when the plant is deficient in potassium. In rice roots, a sodium
transporter OsHKT2;1 mediates the active sodium uptake. We previously
revealed that variation in the expression of \emph{OsHKT2;1} underlie
the variation in sodium uptake between a low-sodium-uptake \emph{indica}
cultivar, IR64, and a high-sodium-uptake japonica cultivar, Koshihikari.
In the present study, we evaluated IR64 and its near-isogenic line
IR64-K that carrying \emph{OsHKT2;1} and neighboring genes inherited
from Koshihikari for grain yields. IR64-K had a greater average grain
yield and harvest index than IR64 in a pot culture experiment with three
levels of potassium fertilizer. The differences were most significant
under treatment without potassium fertilizer. IR64-K also showed a
slightly higher grain yield than IR64 when grown in a paddy field
without potassium fertilizer application. These results suggest that the
enhanced ability of sodium uptake improves grain yields of rice plants
under low-potassium-input conditions.%
\end{abstract}%



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