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Growth, photosynthesis, and nutrient uptake in wheat are affected by differences in nitrogen levels and forms and potassium supply

文献类型： 外文期刊

作者： Guo, Jiuxin 1 ; Jia, Yamin 1 ; Chen, Huanhuan 1 ; Zhang, Lijun 1 ; Yang, Jinchang 1 ; Zhang, Jun 2 ; Hu, Xiangyu 3 ; Ye, 1 ;

作者机构： 1.Fujian Agr & Forestry Univ, Coll Resources & Environm, Int Magnesium Inst, Fuzhou 350002, Peoples R China

2.Fujian Agr & Forestry Univ, Coll Resources & Environm, Inst Plant Nutr Physiol & Mol Biol, Fuzhou 350002, Peoples R China

3.Guangdong Acad Agr Sci, Rice Res Inst, Guangzhou 510640, Guangdong, Peoples R China

4.Anhui Sci & Technol Univ, Minist Agr, Coll Resource & Environm, Key Lab Bioorgan Fertilizer Creat, Bengbu 233100, Peoples R China

期刊名称：SCIENTIFIC REPORTS （ 影响因子：4.379； 五年影响因子：5.133 ）

ISSN： 2045-2322

年卷期： 2019 年 9 卷

页码：

收录情况： SCI

摘要： Nitrogen (N) and potassium (K) are essential macronutrients for plants growth; however, the mechanism by which K mediates negative effects on ammonium-sensitive plants is still poorly understood. We hypothesized that K supplies may enhance antagonistic ammonium stress while improving nitrate nutrition function, which wheat seedlings were grown in sand culture in the presence of two N forms (ammonium; nitrate) supplied at two rates (2, 10 mmol L-1) and three K levels (0.5, 5, 15 mmol L-1). We found that a high N rate increased plant biomass under nitrate nutrition, while it had a negative effect under ammonium nutrition. Compared with nitrate, biomass was depressed by 54% or 85% for low or high N rate under ammonium. This resulted in a reduction in gas exchange parameters and a subsequent decrease in growth variables and nutrient uptake, whereas these parameters increased significantly with increasing K levels. Moreover, in principal components analysis, these variations were highly clustered under nitrate nutrition and highly separated under ammonium nutrition. Our study shows a clear positive interaction between K and N, suggesting that high K supply relieves ammonium stress while improving growth vigor under nitrate nutrition by enhancing nutrient uptake and assimilate production in wheat plants.

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