Effects of ammonium toxicity on nitrogen metabolism and elemental profile of cucumber plants
Effects of ammonium toxicity on nitrogen metabolism and elemental profile of cucumber plants
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DOI：
10.1080/01904160701629211
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发表时间：
2007-01-01
影响因子：
2.1
通讯作者：
Schjoerring, Jan K.
中科院分区：
文献类型：
--
作者：
Roosta, Hamid R.;Schjoerring, Jan K.
研究了不同氮源[硝态氮（NO3-）、铵态氮（NH4+）和铵态氮（NH4NO3）]在1、5、10和15 mM浓度下对黄瓜（Cucumis sativus L.）生长的铵态氮（NH4+）毒性。当生长培养基中铵的浓度超过1 mM时，铵在叶片、茎和根中积累强烈，组织NH4+的增加与谷氨酰胺合成酶活性饱和、谷氨酰胺和精氨酸积累一致。饲喂NH4+的植物组织中钙和镁的低水平是NH4+中毒综合征的一部分。少量NH4+对NO3栽培黄瓜植株的生长有显著促进作用。
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 the concentration in the growth medium exceeded 1 mM. The increase in tissue NH4+ coincided with saturation of glutamine synthetase 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 increased the growth.