Effect of Root Surface Iron Plaque on Se Translocation and Uptake by Fe-Deficient Rice

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Effect of Root Surface Iron Plaque on Se Translocation and Uptake by Fe-Deficient Rice

机译：根表铁斑对缺铁水稻硒转运和吸收的影响

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Under anaerobic conditions, ferric hydroxide deposits on the surface of rice roots and affects uptake and translocation of certain nutrients. In the present study, rice plants were cultured in Fe-deficient or sufficient solutions and placed in a medium containing selenium (Se) for 2 h. Then, FeSO4 was added at the various concentrations of 0, 10, 40, or 70mg L-1 to induce varying levels of iron plaque on the root surfaces and subsequent uptake of Se was monitored. The uptake of Se was inhibited by the iron plaque, with the effect proportional to the amount of plaque induced. The activity of cysteine synthase was decreased with increasing amounts of iron plaque on the roots. This may be the important reason for iron plaque inhibition of Se translocation. At each level of iron plaque, Fe-deficient rice had more Se than Fe-sufficient rice. Furthermore, with plaque induced by 20 mg Fe L-1, plants from Fe-deficient media accumulated more Se than those from Fe-sufficient media, as the Se concentration was increased from 10 to 30 or 50 mg L-1. We found that phytosiderophores, highly effective iron chelating agents, could desorb selenite from ferrihydrite. Root exudates of the Fe-deficient rice, especially phytosiderophores in the exudates, could enhance Se uptake by rice plants with iron plaque.

机译：在无氧条件下，氢氧化铁沉积在稻根表面，影响某些养分的吸收和转运。在本研究中，水稻植株在缺铁或缺铁的溶液中培养，并置于含硒（Se）的培养基中2 h。然后，以0、10、40或70mg L-1的各种浓度添加FeSO4，以在根表面诱导不同水平的铁斑，并监测随后对Se的吸收。铁斑块抑制了硒的吸收，其作用与诱导的斑块量成正比。随着根上铁斑量的增加，半胱氨酸合酶的活性降低。这可能是铁斑块抑制硒易位的重要原因。在铁斑的每个水平上，缺铁米的含硒量都高于含铁米。此外，当斑块由20 mg Fe L-1诱导时，随着Se浓度从10 mg L-1增加到30 mg或50 mg L-1，来自缺铁培养基的植物比来自缺铁培养基的植物积累更多的Se。我们发现植物铁载体，高效的铁螯合剂，可以从亚铁酸盐中解吸亚硒酸盐。缺铁水稻的根系分泌物，特别是渗出物中的植物铁载体，可以增强带有铁斑的水稻对硒的吸收。

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《土壤圈（英文版）》 |2007年第5期|580-587|共8页
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作者单位

State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences,Nanjing 210008,China;

College of Resources and Environment, Southwest University, Chongqing 400716,China;

State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences,Nanjing 210008,China;

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收录信息中国科学引文数据库(CSCD);中国科技论文与引文数据库(CSTPCD);
原文格式 PDF
正文语种 chi
中图分类农业基础科学;
关键词
iron plaque, phytosiderophore, rice, selenium uptake and translocation;

机译：铁斑块;植物铁载体;大米;硒的吸收和转运;
入库时间 2022-08-19 04:04:15

Effect of Root Surface Iron Plaque on Se Translocation and Uptake by Fe-Deficient Rice

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