硒(Se)肥料最近已用于减少植物中镉(Cd)的积累。进行盆栽以分析Cd吸收,易位,硒酸盐施用于土壤后,在Cd污染土壤中的生殖生长期在小麦植物中的分布,并进行了水培培养,以研究硒酸盐对Cd2内流的影响,亚细胞Cd分布,和小麦幼苗中Cd的积累。结果表明,硒酸盐的施用对土壤中DTPA-Cd和Cd含量没有显着影响。硒酸盐的施用极大地抑制了整个植物对Cd的吸收14%-23%。此外,硒酸盐通过增加Cd在液泡中的分布来促进Cd在根中的保留,根至茎的Cd易位减少了18%-53%。硒酸盐的应用增加了节点中的Cd浓度,抑制Cd从营养器官向谷物的再动员,最终降低了小麦籽粒中Cd的积累。Further,抽穗到籽粒灌浆是外源硒酸盐调控籽粒Cd积累的关键生长阶段。总之,土壤硒酸盐的施用是降低小麦籽粒Cd浓度的有效方法,为Cd污染土壤的修复提供了科学依据。
Selenium (Se) fertilizer has been recently used to reduce cadmium (Cd) accumulation in plant. A pot culture was performed to analyze Cd uptake, translocation, and distribution in wheat plants during the reproductive growth period in a Cd-contaminated soil after
selenate was applied to the soil, and a hydroponic culture was carried out to investigate the effects of
selenate application on Cd2+ influx, subcellular Cd distribution, and Cd accumulation in wheat seedlings. Results showed that
selenate application had no significant effect on DTPA-Cd and Cd fraction in soil. The application of
selenate greatly inhibited the whole-plant Cd absorption by 14%-23%. In addition, selenate prompted the retention of Cd in root by increasing the Cd distribution in the vacuole, which reduced the root-to-shoot Cd translocation by 18%-53%. The application of
selenate increased the Cd concentration in nodes, inhibited Cd remobilization from nutritive organs to grain, and ultimately reduced Cd accumulation in wheat grain. Further, heading to grain filling was the key growth stage for exogenous selenate to regulate grain Cd accumulation. In summary, soil selenate application is an effective method to reduce grain Cd concentration in wheat, which provided scientific basis for remediation of Cd-contaminated soil.