Jung Ha-Il, Lee Jinwook, Chae Mi-Jin, Kong Myung-Suk, Lee Chang-Hoon, Kang Seong-Soo, Kim Yoo-Hak
Division of Soil and Fertilizer, National Institute of Agricultural Science, RDA, Wanju, 55365, Republic of Korea.
Department of Integrative Plant Science, College of Biotechnology and Natural Resource, Chung-Ang University, Anseong, 17546, Republic of Korea.
Environ Monit Assess. 2017 Nov 16;189(12):638. doi: 10.1007/s10661-017-6350-3.
Arsenic (As) accumulation in rice owing to uptake from the soil is a critical human health issue. Here, we studied the chemical properties of As-treated soils, growth inhibition patterns of As-stressed rice plants, changes in the As content of soil and soil solutions, and the relationship between As accumulation and As transfer factor from the soil to the rice organs. Rice plants were cultivated in a greenhouse under four concentrations of As: 0 (control), 25, 50, and 75 mg kg. A significant positive correlation was found between available PO and exchangeable K and between As concentration and available PO or exchangeable K. The As concentration for 50% shoot growth inhibition was 50 mg kg. As levels in roots and shoots were positively correlated with the growth stages of rice. The transfer factor (TF) increased with As concentration at the tillering stage but decreased at the heading stage. TF and TF were higher at the heading stage than at the tillering stage. As accumulation in the 25 mg kg treatment was higher during the heading stage, whereas no difference was found at the tillering stage. As accumulation was related to plant biomass and soil As concentration. We found that As accumulation was greater at As concentrations that allowed for plant growth and development. Thus, species-specific threshold concentrations must be determined based on As phytotoxicity for the phytoremediation of As-contaminated soils. Hence, developing practical approaches for managing safe crop production in farmlands with an As contamination of 25 mg kg or less is necessary.
由于从土壤中吸收，水稻中砷（As）的积累是一个关键的人类健康问题。在此，我们研究了经砷处理土壤的化学性质、砷胁迫水稻植株的生长抑制模式、土壤和土壤溶液中砷含量的变化，以及砷积累与从土壤到水稻器官的砷转移因子之间的关系。在温室中以四种砷浓度种植水稻植株：0（对照）、25、50和75毫克/千克。发现有效磷与交换性钾之间以及砷浓度与有效磷或交换性钾之间存在显著正相关。50%地上部生长抑制的砷浓度为50毫克/千克。根和地上部的砷含量与水稻的生长阶段呈正相关。转移因子（TF）在分蘖期随砷浓度增加而增加，但在抽穗期降低。穗期的TF和TF高于分蘖期。25毫克/千克处理在抽穗期的砷积累较高，而在分蘖期未发现差异。砷积累与植物生物量和土壤砷浓度有关。我们发现，在允许植物生长发育的砷浓度下，砷积累量更大。因此，必须根据砷对植物的毒性确定特定物种的阈值浓度，以用于砷污染土壤的植物修复。因此，有必要开发实用方法来管理砷污染25毫克/千克或更低的农田中的安全作物生产。
