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>Growth photosynthesis and nutrient uptake in wheat are affected by differences in nitrogen levels and forms and potassium supply
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Growth photosynthesis and nutrient uptake in wheat are affected by differences in nitrogen levels and forms and potassium supply
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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机译:氮(N)和钾(K)是植物生长必不可少的大量营养素。然而,人们对钾介导对铵敏感植物不利影响的机理仍知之甚少。我们假设钾的供应可以增强铵态氮的拮抗作用,同时改善硝酸盐的营养功能,这种小麦幼苗是在沙土栽培中以两种氮素(2、10-mmol L s- 1 sup>)和三个K水平(0.5、5、15 mmol L -1 sup>)。我们发现,高氮素水平在硝酸盐营养下增加了植物生物量,而在铵盐营养下却有负面影响。与硝酸盐相比,铵态下低氮或高氮的生物量降低了54%或85%。这导致气体交换参数减少,随后生长变量和养分吸收减少,而这些参数随着钾水平的增加而显着增加。此外,在主成分分析中,这些变化在硝酸盐营养下高度聚集,而在铵营养下高度分离。我们的研究表明钾和氮之间存在明显的正相互作用,这表明高钾供应缓解了铵胁迫,同时通过增强养分吸收和吸收小麦植物的吸收而改善了硝酸盐营养下的生长活力。
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