Effects of improved sodium uptake ability on grain yields of rice plants under low potassium supply. (12th April 2022)

• Record Type: Journal Article
• Authors: Ochiai, Kumiko; Oba, Kousuke; Oda, Kanoko; Miyamoto, Takuji; Matoh, Toru
• Is Part Of: Plant direct. Volume 6:Number 4(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-04-12
• Subjects: beneficial element -- Oryza sativa -- potassium -- QTL -- rice -- sodium; Plants -- Periodicals; Botany -- Periodicals; 571.205
• DOI: 10.1002/pld3.387
• Languages: English
• ISSNs: 2475-4455

Abstract

Abstract: Sodium uptake is a factor that determines potassium use efficiency in plants as sodium can partially replace potassium in plant cells. Rice ( 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 active sodium uptake. We previously revealed that variation in the expression of OsHKT2;1 underlies the variation in sodium accumulation between a low‐sodium‐accumulating indica cultivar, IR64, and a high‐sodium‐accumulating japonica cultivar, Koshihikari. In the present study, we evaluated IR64 and its near‐isogenic line IR64‐K carrying OsHKT2;1 and neighboring genes inherited from Koshihikari for grain yield. 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 the potassium fertilizer. IR64‐K also showed a slightly higher grain yield than IR64 when grown in a paddy field without applying the potassium fertilizer. These results suggest that enhanced sodium uptake ability improves the grain yield of rice plants under low‐potassium‐input conditions.