Uptake of different species of iodine by water spinach and its effect to growth.
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.
Weng
Huan-Xin
HX
Institute of Environment and Biogeochemistry, Zhejiang University, Hangzhou, People's Republic of China. gswenghx@zju.edu.cn
Yan
Ai-Lan
AL
Hong
Chun-Lai
CL
Xie
Lin-Li
LL
Qin
Ya-Chao
YC
Cheng
Charles Q
CQ
D018533:Biomass; D018527:Hydroponics / Q000379:methods*; D007455:Iodine / Q000378:metabolism* / Q000494:pharmacology*; D027741:Ipomoea / Q000254:growth & development* / Q000378:metabolism; D018515:Plant Leaves / Q000254:growth & development* / Q000378:metabolism
D007455:Iodine