Ionome profiling and arsenic speciation provide evidence of arsenite detoxification in rice by phosphate and arsenite-oxidizing bacteria  

作　　者：Guobing Lin Xiaoman He Jiayuan Zeng Zhaoguang Yang Lin Wang 

机构地区：[1]College of Chemistry and Chemical Engineering,Central South University,Changsha 410083,China [2]Key Laboratory of Hunan Province for Water Environment and Agriculture Product Safety,Central South University,Changsha 410083,China

出　　处：《Journal of Environmental Sciences》2023年第6期129-138,共10页环境科学学报（英文版）

基　　金：This work was supported by the National Natural Science Foundation of China(No.41977351);the Natural Science Foundation of Hunan Province,China(No.2020JJ4698).

摘　　要：Arsenite(As(III))as the most toxic and mobile form is the dominant arsenic(As)species in flooded paddy fields,resulting in higher accumulation of As in paddy rice than other terrestrial crops.Mitigation of As toxicity to rice plant is an important way to safeguard food production and safety.In the current study,As(III)-oxidizing bacteria Pseudomonas sp.strain SMS11 was inoculated with rice plants to accelerate conversion of As(III)into lower toxic arsenate(As(V)).Meanwhile,additional phosphate was supplemented to restrict As(V)uptake by the rice plants.Growth of rice plant was significantly inhibited under As(III)stress.The inhibition was alleviated by the introduction of additional P and SMS11.Arsenic speciation showed that additional P restricted As accumulation in the rice roots via competing common uptake pathways,while inoculation with SMS11 limited As translocation from root to shoot.Ionomic profiling revealed specific characteristics of the rice tissue samples from different treatment groups.Compared to the roots,ionomes of the rice shoots were more sensitive to environmental perturbations.Both extraneous P and As(III)-oxidizing bacteria SMS11 could alleviate As(III)stress to the rice plants through promoting growth and regulating ionome homeostasis.

关 键 词：As(III)-oxidizing bacteria Ionomics Ionome homeostasis Paddy rice Stress alleviation 

分 类 号：S511[农业科学—作物学] X56[环境科学与工程—环境工程] X173