HAG1 Regulates Arsenic Allocation and Accumulation in Rice Grains  

作　　者：YANG Huan YU Jing XIE Manyi XU Ping CAO Zhenzhen CHEN Mingxue CAO Zhaoyun 

机构地区：[1]Rice Product Quality Inspection and Supervision Center,Ministry of Agriculture and Rural Affairs,China National Rice Research Institute,Hangzhou 310006,China

出　　处：《Rice science》2025年第1期1-5,I0001-I0009,共14页水稻科学(英文版)

基　　金：supported by the earmarked fund for‘Pioneer’and‘Leading Goose’R&D Program of Zhejiang Province,China(Grant No.2023C02014);the Central Public Interest Scientific Institution Basal Research Fund for the China National Rice Research Institute(Grant No.CPSIBRF-CNRRI-202407).

摘　　要：Rice is a well-recognized accumulator of arsenic(As),which poses a threat to food security and human health.Different rice varieties vary widely in their As accumulation and tolerance,yet the underlying genetic basis remains unknown.In this study,we isolated a rice mutant hag1,which displayed high accumulation of As in rice grains and increased sensitivity to As toxicity.Using genetic investigation,we identified the ATP-binding cassette(ABC)transporter OsABCC1,involved in sequestering As in vacuoles,as the causal gene responsible for As allocation and tolerance in rice.Detailed physiological analysis revealed that As stress caused more severe oxidative damage in hag1 compared with the wild type(WT).The hag1 mutant displayed different accumulation patterns depending on the levels of As stress.We discovered that under low As concentration,hag1 synthesized more thiol compounds and exhibited lower As translocation than the WT;however,at high As levels,hag1 produced fewer thiol compounds and increased As transfer factor.Transcriptome analysis of the node nearest to the panicles revealed that OsABCC1 was down-regulated in hag1,resulting in increased As translocation and accumulation in rice grains.Additionally,natural variations in the promoter of OsABCC1 may confer differential gene expression and distinct As accumulations in grains between japonica and indica rice varieties,providing insights for breeding low-As rice varieties.

关 键 词：BREEDING grains INSIGHT 

分 类 号：S51[农业科学—作物学]