Fate of Cadmium and Arsenic Under Engineered Physico-Chemical Gradients in the Soil-Water-Rice Nexus

土壤-水-水稻关系中工程物理化学梯度下镉和砷的归宿

基本信息

批准号：
1930806
负责人：
Angelia Seyfferth
金额：
$ 35.39万
依托单位：
University of Delaware
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2019
资助国家：
美国
起止时间：
2019-10-01 至 2023-09-30
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1930806&HistoricalAwards=false
关键词：
Fate Cadmium Arsenic Under Engineered

项目摘要

Rice is a staple food for half the world's population. Despite its importance, the yield and quality of rice are threatened by arsenic and cadmium uptake from soil. Rice will uptake and concentrate arsenic when it is grown under conventional soil flooding, because arsenic is released into the water from biogeochemical reactions in the soil. This process can happen even when soil arsenic concentrations are low. Although minimizing soil flooding can decrease arsenic contamination of rice and even save water resources, doing so can increase rice grain uptake of cadmium from the soil. The goal of this research project is to develop methods that simultaneously limit rice uptake of both arsenic and cadmium. Manganese(II) is less toxic to plants than cadmium or arsenic and has been recently shown to share a root transport pathway with cadmium. Therefore, it should be possible to exploit the geochemical characteristics of manganese to decrease uptake of cadmium into the plant via engineered soil electrochemistry. This research project takes a multidisciplinary approach that incorporates geochemistry and plant biology methods and also will utilize resources at the NSF-funded Rice Investigation, Communication, and Education (RICE) Facility. This work will help train and foster the professional development of the next generation of STEM professionals to tackle the grand challenge of a sustainable food supply. Additional outreach efforts to high schools will increase scientific literacy of students and hopefully interest them in STEM careers.Rice is often the first food consumed by infants and is also a staple food for half of the global population. However, the yield and quality of rice are threatened by the uptake of toxic arsenic and cadmium during the soil flooding process integral to rice cultivation. Although arsenic cycling has been well studied over the last two decades, cadmium cycling and uptake by rice is less well understood. The hypothesis behind this research project is that controlling manganese(II) availability can provide an engineered solution to limit cadmium and arsenic uptake by rice. The specific objectives of this project are 1) to understand the role of increasing manganese(II) availability in decreasing cadmium uptake by rice in simple hydroponic systems; 2) to evaluate the impact of engineered redox states on dissolution, plant uptake, and localization of metal(loid)s including manganese, iron, cadmium, and arsenic, in rice plants grown in rice paddy mesocosms; and 3) to compare traditional redox measurements to novel techniques for quantifying indicators of reduction in soil (IRIS) films. IRIS film technology will be evaluated as a low-cost means for farmers to know when to drain their fields in order to restrict rice uptake of toxic metalloids. The outcomes of this research will transform the ability of rice agronomists, wetland scientists, farmers, and other stakeholders to prevent toxic metal uptake and thereby safeguard the food supply of billions of people. The results of this study should be applicable to many other plants beyond rice, because many plants also accumulate cadmium.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

米饭是世界一半人口的主食。尽管它很重要，但水稻的产量和质量仍受到土壤吸收砷和镉的威胁。大米在常规的土壤洪水下生长时会吸收和浓缩砷，因为砷从土壤中的生物地球化学反应中释放到水中。即使土壤砷浓度较低，这种过程也会发生。尽管最大程度地减少土壤洪水可以减少砷对大米的污染，甚至可以节省水资源，但这样做可以增加土壤中镉的含量。该研究项目的目的是开发同时限制砷和镉的水稻吸收的方法。锰（II）对植物的毒性低于镉或砷，最近已显示与镉共享根传输途径。因此，应该有可能利用锰的地球化学特征通过工程土壤电化学降低镉对植物的摄取。该研究项目采用了多学科方法，该方法结合了地球化学和植物生物学方法，并将在NSF资助的水稻调查，交流和教育（稻米）设施中利用资源。这项工作将有助于培训和促进下一代STEM专业人员的专业发展，以应对可持续粮食供应的巨大挑战。对高中的额外宣传工作将提高学生的科学素养，并希望他们对STEM职业感兴趣。但是，在水稻种植不可或缺的土壤洪水过程中，在土壤洪水过程中吸收有毒的砷和镉的产量和质量受到威胁。尽管在过去的二十年中，对砷骑自行车进行了很好的研究，但大米的镉自行车和吸收量不太了解。该研究项目背后的假设是控制锰（II）的可用性可以提供一种工程解决方案，以限制米饭的镉和砷摄取。该项目的具体目标是1）了解增加锰（II）在简单水培系统中米饭摄取镉摄取中的作用； 2）评估工程氧化还原状态对金属（包括锰，铁，镉和砷）的溶解，植物吸收和定位的影响，在稻田中生长的水稻植物中； 3）将传统的氧化还原测量与新技术进行比较，以量化土壤（虹膜）膜减少的指标。虹膜胶片技术将被评估为一种低成本的手段，供农民知道何时排干田地，以限制水稻对有毒金属的吸收。这项研究的结果将改变水稻农艺师，湿地科学家，农民和其他利益相关者预防有毒金属吸收的能力，从而保护了数十亿人的粮食供应。这项研究的结果应适用于大米以外的许多其他植物，因为许多植物也积累了镉。该奖项反映了NSF的法定任务，并被认为是值得通过基金会的知识分子优点和更广泛影响的评估评估的评估来支持的。

项目成果

期刊论文数量（9）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

The effect of silicon on the kinetics of rice root iron plaque formation

DOI：
10.1007/s11104-022-05414-4
发表时间：
2022-04-19
期刊：
PLANT AND SOIL
影响因子：
4.9
作者：
Limmer，Matt A.;Thomas，John;Seyfferth，Angelia L.
通讯作者：
Seyfferth，Angelia L.

The IRIS Imager: A freeware program for quantification of paint removal on IRIS films

IRIS Imager：用于量化 IRIS 胶片上油漆去除的免费软件程序

DOI：
10.1002/saj2.20308
发表时间：
2021
期刊：
Soil Science Society of America Journal
影响因子：
2.9
作者：
Limmer, Matt A.;Evans, Abby E.;Seyfferth, Angelia L.
通讯作者：
Seyfferth, Angelia L.

Low levels of arsenic and cadmium in rice grown in southern Florida Histosols - Impacts of water management and soil thickness

佛罗里达州南部种植的水稻中砷和镉含量较低 Histosols - 水管理和土壤厚度的影响

DOI：
10.1016/j.scitotenv.2023.161712
发表时间：
2023
期刊：
Science of The Total Environment
影响因子：
9.8
作者：
Hu, Ruifang;Cooper, Jennifer A.;Daroub, Samira H.;Kerl, Carolin F.;Planer-Friedrich, Britta;Seyfferth, Angelia L.
通讯作者：
Seyfferth, Angelia L.

The effect of rice residue management on rice paddy Si, Fe, As, and methane biogeochemistry

稻渣管理对稻田硅、铁、砷和甲烷生物地球化学的影响