Weng Huan-Xin, Yan Ai-Lan, Hong Chun-Lai, Xie Lin-Li, Qin Ya-Chao, Cheng Charles Q
Institute of Environment and Biogeochemistry, Zhejiang University, Hangzhou, People's Republic of China.
Biol Trace Elem Res. 2008 Aug;124(2):184-94. doi: 10.1007/s12011-008-8137-4. Epub 2008 May 1.
A hydroponic experiment has been carried out to study the influence of iodine species [iodide (I(-)), iodate (IO(-)(3)), and iodoacetic acid (CH(2)ICOO(-))] and concentrations on iodine uptake by water spinach. Results show that low levels of iodine in the nutrient solution can effectively stimulate the growth of biomass of water spinach. When iodine levels in the nutrient solution are from 0 to 1.0 mg/l, increases in iodine levels can linearly augment iodine uptake rate by the leafy vegetables from all three species of iodine, and the uptake effects are in the following order: CH(2)ICOO(-) >I(-)>IO(-)(3). In addition, linear correlation was observed between iodine content in the roots and shoots of water spinach, and their proportion is 1:1. By uptake of I(-), vitamin C (Vit C) content in water spinach increased, whereas uptake of IO(-)(3) and CH(2)ICOO(-) decreased water spinach Vit C content. Furthermore, through uptake of I(-) and IO(-)(3). The nitrate content in water spinach was increased by different degrees.
进行了一项水培实验，以研究碘形态[碘化物（I(-)）、碘酸盐（IO(-)(3)）和碘乙酸（CH(2)ICOO(-)）]及浓度对蕹菜吸收碘的影响。结果表明，营养液中低水平的碘能有效刺激蕹菜生物量的增长。当营养液中碘水平为0至1.0毫克/升时，碘水平的增加可使三种碘形态的叶菜类蔬菜的碘吸收速率呈线性增加，吸收效果顺序为：CH(2)ICOO(-)>I(-)>IO(-)(3)。此外，观察到蕹菜根和茎中的碘含量呈线性相关，其比例为1:1。通过吸收I(-)，蕹菜中的维生素C（Vit C）含量增加，而吸收IO(-)(3)和CH(2)ICOO(-)则降低了蕹菜的Vit C含量。此外，通过吸收I(-)和IO(-)(3)，蕹菜中的硝酸盐含量有不同程度的增加。
