文档介绍:
Fe 形态对水稻根际 Fe、Cd 吸附与根系吸收
的影响#
刘丹青1,2,陈雪1,葛滢1,2**
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(1. 南京农业大学资源与环境科学学院,南京 210095;
2. 中国科学院南京土壤研究所,土壤与农业持续发展国家重点实验室,南京 210008)
摘要:采用营养液-蛭石联合培养试验,分别设置硫酸亚铁、草酸亚铁和柠檬酸铁三种 Fe 形
态处理。探讨了不同 Fe 形态处理下的不同根际性状对水稻根系分泌低分子量有机酸、根际
蛭石表面、根系表面 Fe,Cd 吸附及根系 Fe、Cd 吸收的影响。研究结果表明,低分子量有
机酸在水稻根际性状、根系 Fe,Cd 吸附、吸收及转运过程中扮演着很重要的作用。施用柠
檬酸铁会增加水稻根系分泌的低分子量有机酸总量,对水稻 Fe、Cd 吸收与转运有促进作用。
草酸亚铁处理下活性态 Fe 增加,可能通过抑制了缺 Fe 机制策略的表达,进而减少对 Cd 具
有转运功能的膜转运蛋白 OsIRT1 和 OsIRT2,从而降低根系对 Cd 的吸收。硫酸亚铁处理下
的自由态 Fe2+极易被氧化成 Fe3+,以非晶态形式大量吸附于根际环境中,减少了 Cd 在根内
的积累量。
关键词:环境科学;水稻;Fe 形态;根际;镉;吸附;吸收
中图分类号:X506
Effects of iron form on Fe, Cd adsorption in the rhizosphere
and their accumulation in rice
LIU Dianqing1,2, CHEN Xue1, GE Ying1,2
(1. College of Resource and Environmental Science, Nanjing Agricultural University, Nanjing
210095;
2. State Key Laboratory of Soil and Sustainable Agriculture, Nanjing Institute of Soil Science,
Chinese Academy of Sciences, Nanjing 210008)
Abstract: Effects of the rhizospheric conditions under different treatment Fe form on Cd and Fe
adsorption on the vermiculite/root surface and their uptake by rice were investigated using nutrient
solution and vermiculite culture. Results showed that LWMOAs played an important role during the
process of Cd and Fe adsorption on the rice roots and their accumulation in rice roots/shoots.
Compared with ferrous sulfate(FeSO4) and