%A ZOU Wei-Wei,LU Xue-Li,WANG Li,XUE Da-Wei,ZENG Da-Li,LI Zhi-Xin %T Potassium uptake and genome-wide association analysis of rice under different nitrogen levels %0 Journal Article %D 2019 %J Acta Agronomica Sinica %R 10.3724/SP.J.1006.2019.82058 %P 1189-1199 %V 45 %N 8 %U {https://zwxb.chinacrops.org/CN/abstract/article_6718.shtml} %8 2019-08-12 %X

A total of 134 resequenced rice landraces were used for assessing the potassium content, plant dry weight and potassium accumulation at three different nitrogen levels including no nitrogen fertilizer (N0), 96 kg ha -1 (N1), and 192 kg ha -1 (N2) under normal field cultivation, respectively. All the three traits displayed normal distribution with abundant variations under N0, N1, and N2 nitrogen levels, respectively. K accumulation and plant dry weight showed positive correlation with nitrogen levels. Meanwhile, the negative correlation was detected between K content and dry weight, and there was positive correlation between dry weight and K accumulation. In addition, the K content showed significantly lower in indica than in japonica, while the dry weight and K accumulation in indica were significantly higher than those in japonica. A total of 12 SNPs presented significant association with the potassium content, plant dry weight and potassium accumulation under three diferent nitrogen levels, including two SNPs for K accumulation, five SNPs for K content and five SNPs for dry weight. A SNP (Chr6_1,524,776) associated with potassium content on chromosome 6 was detected at N1 level. Its flank contained a receptor-like kinase, RUPO, which interacts with potassium transporters in rice. According to the difference of potassium content, one SNP and three SNPs were identified with high nitrogen and low nitrogen response, respectively. While four candidate genes closed to the SNP (Chr10_2,822,026) were associated to K content relatively changed under both high nitrogen and low nitrogen levels, showing different expression levels under different nitrogen levels.