Effects of Ammonium Toxicity on Nitrogen Metabolism and Elemental Profile of Cucumber
观赏蟹种类Plants
期刊名称： Journal of Plant Nutrition
d的笔顺怎么写作者： Roosta, Hamid R., Schjoerring, Jan K.
户外游戏
年份： 2007年高新技术企业认定管理办法
期号： 第11期房产个税
关键词： amino acid, cations, glutamine syntheta, nitrate reducta, Cucumis sativus
高考的重要性
摘要：Aspects of ammonium (NH4 +) toxicity in cucumber (Cucumis sativus L.) were investigated following growth with different N sources [nitrate (NO3 ), NH4 +, or NH4NO3] supplied in concentrations of 1, 5, 10, or 15 mM. Plant dry weights and root: shoot ratios were lower with NH4 +-fed plants than with NO3 -fed plants. Ammonium accumulated strongly in leaves, stem, and roots when
羞耻的近义词the concentration in the growth medium exceeded 1 mM. The increa in tissue NH4 + coincided with saturation of glutamine syntheta activity and accumulation of glutamine and arginine. Low tissue levels of calcium and magnesium in the NH4 +-fed plants constituted part of the NH4 +-toxicity syndrome. Additions of small amounts of NH4 + to NO3 -grown cucumber plants markedly incread the growth.
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