小白菜和空心菜对不同形态碘的吸收

通过营养液培养试验研究了小白菜和空心菜对不同形态碘(I-、IO3-和CH2ICOO-)的吸收特征。研究结果表明,低水平的外源碘能促进小白菜和空心菜的生长;在0～1.0.mg/L(以I计算)的碘水平范围内,小白菜和空心菜对碘的吸收量随外源碘水平的提高而增加;对不同形态碘吸收量大小顺序为:CH2ICOO-I-IO3-。小白菜和空心菜根部和地上部分中碘的含量之间呈显著相关性,其中小白菜根部和地上部分中碘的含量比约为2∶1;空心菜根部和地上部分碘的含量比约为1∶1,反映了不同蔬菜对碘吸收的差异性。

Uptake of bok-choy and Ipomoea aquatica Forsk to iodine species

A hydroponic experiment was carried out to investigate the influence of iodine species: iodide(I^-),iodate(IO₃^-) and iodoacetic acid(CH₂ICOO^-) on iodine uptake by leafy vegetables(Bok-choy and Ipomoea aquatica Forsk). The results show that low level of iodine can efficiently promote the biomass of Bok-choy and Ipomoea aquatica Forsk.When iodine level in the nutrient solution from 0 to 1.0 mg/L,the iodic quantities uptaked by bok-choy and Ipomoea aquatica Forsk are enhanced with the iodine levels in nutrient solution increase.The rank of iodine species by Bok-choy and Ipomoea aquatica Forsk is CH₂ICOO^->I^->IO₃^-.There is a significant correlativity between the I contents in shoots and roots of bok-choy and Ipomoea aquatica Forsk.The ratios of I contents in roots to in shoots of bok-choy and Ipomoea aquatica Forsk are roughly 2∶1 and 1∶1,respectively,which indicates the differences in iodine uptaked by plants.