摘要
砷(As)作为有毒类金属元素,其释放到水和土壤环境中,可以亚砷酸(H_(3)AsO_(3))的形式通过水稻吸收进入食物链,造成水稻砷污染物的积累。硼酸(H3BO_(3))与H_(3)AsO_(3)有相似的水化半径,推测硼(B)可能通过竞争转运通道或抑制As转运蛋白基因表达等方式,减少水稻幼苗对土壤环境中As的吸收。该研究以杂交水稻品种“黄华占”为研究对象,设计4种B浓度[0(CK)、0.15(T1)、0.35(T2)、0.5(T3)mmol/L]下的水稻水培实验,以探讨B对水稻幼苗砷代谢的调控效果。结果显示:As(Ⅲ)处理下,施加B的3组处理水稻幼苗叶绿素相对含量、株高、根长等生理指标均高于CK对照组,水稻生长情况更好。As(Ⅲ)处理下,随着营养液中B浓度的上升,水稻幼苗地下部分总As含量显著减少,As转运系数未有显著变化。As(Ⅴ)处理下,除水稻幼苗地下鲜重显著增加外,其他生理指标变化未显示出显著性,但相对于CK对照组,T2和T3组水稻幼苗中的地上部分总As含量和根As吸收效率均显著降低。施加外源硼可以一定程度上抑制水稻地下部As积累和根部对As的吸收,深入研究硼对水稻砷代谢的影响机制对减少粮食作物对环境中砷的富集具有重要意义。
Arsenic(As),a toxic metalloid element,when released into aquatic and soil environments,can be absorbed by rice through the arsenous acid(H_(3)AsO_(3))form,entering the food chain and leading to the accumulation of As contaminants in rice.boric acid(H_(3)BO_(3))has a similar hydration radius to H3AsO_(3).It is speculated that boron(B)may reduce As uptake by rice seedlings from the soil environment through competitive transport pathways or by inhibiting the expression of arsenic trans⁃port protein genes.This study utilized the hybrid rice variety Huanghuazhan and designed four boron concentrations including 0(CK),0.15(T1),0.35(T2),0.5(T3)mmol/L for hydroponic experiments to investigate the regulatory effect of boron on ar⁃senic metabolism in rice seedlings.The results showed that under As(Ⅲ)treatment,physiological indicators such as SPAD value,plant height,and root length of rice seedlings in the boron-treated groups were higher than those in the CK control group,indicating improved rice growth.With increasing boron concentration in the nutrient solution under As(Ⅲ)treatment,the total arsenic content in the underground part of rice seedlings significantly decreased,while As transport coefficient did not change significantly.Under As(Ⅴ)treatment,apart from a significant increase in the fresh weight of rice seedlings in the underground part,no significant changes were observed in other physiological indicators.Compared with the CK control group,the total As content in the aboveground part and the root As absorption rate of rice seedlings in the T2 and T3 groups were significantly reduced.The results show that the application of exogenous boron can to some extent inhibit the accumu⁃lation of As in the underground part of rice and the absorption of As by the roots.In-depth research on the impact mecha⁃nism of boron on arsenic metabolism in rice is of great significance for reducing the enrichment of arsenic in food crops in the environment.
作者
薛乐滋
刘娟
江庆
汪明霞
谭文峰
李响
侯静涛
XUE Lezi;LIU Juan;JIANG Qing;WANG Mingxia;TAN Wenfeng;LI Xiang;HOU Jingtao(Key Laboratory of National Environmental Protection for Soil Health Diagnosis and Green Restoration,College of Resources and Environment,Huazhong Agricultural University,Wuhan 430070,China;College of Plant Science and Technology,Huazhong Agricultural University,Wuhan 430070,China)
出处
《环境科学与技术》
北大核心
2025年第5期194-202,共9页
Environmental Science & Technology
基金
国家自然科学基金面上项目(42277015)
华中农业大学省级大学生创新创业项目(S202310504003)。
关键词
水稻
砷
硼
转运通道
吸收
rice
arsenic
boron
transport pathway
uptake
作者简介
薛乐滋(2004-),女,学士,研究方向为环境工程,(电子信箱)1287577988@qq.com;通讯作者:刘娟,(电子信箱)liujuan201312@163.com。
