Journal
BIOLOGICAL TRACE ELEMENT RESEARCH
Volume 124, Issue 2, Pages 184-194Publisher
HUMANA PRESS INC
DOI: 10.1007/s12011-008-8137-4
Keywords
iodide; iodate; iodoacetic acid; iodine deficiency disorders (IDD); water spinach; vitamin C (Vit C); nitrate
Funding
- National Natural Science Foundation of China [40373043]
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A hydroponic experiment has been carried out to study the influence of iodine species [iodide (I-), iodate (IO3-), and iodoacetic acid (CH2ICOO-)] 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: CH2ICOO- > I- > IO3. 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 IO3- and CH2ICOO- decreased water spinach Vit C content. Furthermore, through uptake of I- and IO3-, the nitrate content in water spinach was increased by different degrees.
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