Application of 28Mg for Characterization of Mg Uptake in Rice Seedling under Different pH Conditions
Application of 28Mg for Characterization of Mg Uptake in Rice Seedling under Different pH Conditions
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28Mg在不同pH条件下水稻幼苗吸收镁特性研究中的应用
DOI：
10.1007/s10967-012-2010-9
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发表时间：
2013
影响因子：
1.6
通讯作者：
T.M.
中科院分区：
文献类型：
--
作者：
Kobayashi;N.I.; Iwata;N.; Saito;T.; Suzuki;H.; Iwata;R.; Tanoi;K. and Nakanishi;T.M.
用28 Mg示踪法研究了不同pH值溶液处理水稻幼苗对镁的吸收。28 Mg的应用使得能够在不同pH处理的15 min内测定Mg吸收量。利用成像板测定了水稻对28 Mg的吸收量及其在植株中的分布。结果表明，在0.27 mM Mg溶液（pH 5.6）中，每株植物对Mg的吸收量约为3 μmol/15 min，在较低pH（pH 4.5）条件下，这种吸收量下降了30%。pH 6.5时，吸镁活性为4.4 μmol/15 min。处理15 min内营养液中质子浓度与镁吸收量呈负相关关系，表明低pH条件会抑制镁吸收活性，这是Mg 2+与质子竞争的结果。因此，在低pH条件下，无论其他因素如何，水稻根系镁吸收活性都有所降低。
The magnesium (Mg) uptake of rice seedlings treated with different pH solutions was investigated using tracer of28Mg. The application of28Mg enabled the determination of Mg uptake amount within 15 min of the different pH treatments. The uptake amount of28Mg and its distribution in rice plants were determined by using the imaging plate. The result demonstrated that the Mg uptake amount was approximately 3 μmol/15 min per plant in 0.27 mM Mg solution at pH 5.6, and this uptake decreased by 30 % at lower pH conditions (pH 4.5). On the contrary, the pH 6.5 condition induced the Mg uptake activity to 4.4 μmol/15 min. The inverse relationship found between proton concentration in nutrient solution and the Mg uptake amount within 15 min of treatment demonstrated that the low pH condition could inhibit the Mg uptake activity as a consequence of the competition between Mg2+and proton. It is concluded that under low pH conditions, regardless of other factors, there is a decrease of Mg uptake activity in rice roots.