Comparative physiological and transcriptomic analyses illuminate common mechanisms by which silicon alleviates cadmium and arsenic toxicity in rice seedlings  

作　　者：Huiqiong Chen Xiaoyu Liang Xiaomei Gong John R.Reinfelder Huamei Chen Chongjun Sun Xiulian Liu Shuchang Zhang Fangbai Li Chuanping Liu Junliang Zhao Jicai Yi 

机构地区：[1]College of Life Sciences,South China Agricultural University,Guangzhou 510642,China [2]Department of Environmental Sciences,Rutgers University,New Brunswick,NJ 08901,USA [3]Guangdong Institute of Eco-environmental Science&Technology,Guangzhou 510650,China [4]Rice Research Institute&Guangdong Key Laboratory of New Technology in Rice Breeding,Guangdong Academy of Agricultural Sciences,Guangzhou 510640,China

出　　处：《Journal of Environmental Sciences》2021年第11期88-101,共14页环境科学学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.41877143);the National Key Research and Development Project of China(No.2016YFD0800700);the Science and Technology Planning Project of Guangdong Province(Nos.2015B020237008 and 2015B020207001).

摘　　要：The inessential heavy metal/loids cadmium(Cd)and arsenic(As),which often co-occur in polluted paddy soils,are toxic to rice.Silicon(Si)treatment is known to reduce Cd and As toxicity in rice plants.To better understand the shared mechanisms by which Si alleviates Cd and As stress,rice seedlings were hydroponically exposed to Cd or As,then treated with Si.The addition of Si significantly ameliorated the inhibitory effects of Cd and As on rice seedling growth.Si supplementation decreased Cd and As translocation from roots to shoots,and significantly reduced Cd-and As-induced reactive oxygen species generation in rice seedlings.Transcriptomics analyses were conducted to elucidate molecular mechanisms underlying the Si-mediated response to Cd or As stress in rice.The expression patterns of the differentially expressed genes in Cd-or As-stressed rice roots with and without Si application were compared.The transcriptomes of the Cd-and As-stressed rice roots were similarly and profoundly reshaped by Si application,suggesting that Si may play a fundamental,active role in plant defense against heavy metal/loid stresses by modulating whole genome expression.We also identified two novel genes,0s01g0524500 and 0s06g0514800,encoding a myeloblastosis(MYB)transcription factor and a thionin,respectively,which may be candidate targets for Si to alleviate Cd and As stress in rice,as well as for the generation of Cd-and/or As-resistant plants.This study provides valuable resources for further clarification of the shared molecular mechanisms underlying the Si-mediated alleviation of Cd and As toxicity in rice.

关 键 词：CADMIUM Arsenic Silicon TRANSCRIPTOMICS Myeloblastosis(MYB)transcription factor THIONIN 

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