中国稻米2026，Vol.32Issue(1)：20-25,6.DOI:10.3969/j.issn.1006-8082.2026.01.005
水稻种质资源低镉积累和耐旱性鉴定及基因挖掘
Identification of Low Cadmium Accumulation and Drought Tolerance in Rice Germplasm and Gene Mining
摘要
Abstract
Rice(Oryza sativa L.)is a globally important cereal crop,and the stability of its yield and grain quality plays a crucial role in ensuring food security.However,soil cadmium(Cd)contamination caused by human activities,together with drought stress induced by global climate change,pose serious threats to normal rice growth,adversely affecting both productivity and quality.To effectively address these challenges,we evaluated Cd accumulation capacity and drought tolerance of more than 500 rice germplasm accessions,and performed genotyping using a 50K single nucleotide polymorphism(SNP)chip.In this study,23 rice lines with low Cd accumulation were successfully identified;when grown in field conditions with high Cd contamination,their grain Cd concentrations remained consistently below 0.1 mg/kg.Meanwhile,22 rice lines exhibiting superior drought tolerance were selected,as they maintained survival after a prolonged drought treatment lasting for one month.To further elucidate the genetic basis underlying Cd accumulation and drought tolerance in rice,genome-wide association studies(GWAS)were conducted,leading to the identification of three quantitative trait loci(QTLs)significantly associated with grain Cd content and four QTLs strongly linked to drought tolerance.The low-Cd and drought-tolerant germplasms identified in this study,along with the precisely mapped gene locis related to these traits,provide valuable materials and a theoretical foundation for in-depth genetic research on rice,and lay a solid groundwork for future breeding applications..关键词
水稻/镉积累/耐旱性/种质资源/基因定位Key words
rice/cadmium accumulation/drought tolerance/germplasm resources/gene mapping分类
农业科技引用本文复制引用
李宙炜,蔡珊珊,吴云天,贾高峰,田冰川,尹乾宇,叶昌荣,程计华,王思哲,陈海龙,黎长红,张砚,龙宇..水稻种质资源低镉积累和耐旱性鉴定及基因挖掘[J].中国稻米,2026,32(1):20-25,6.基金项目
湖南省重点研发计划项目(2023NK2001) （2023NK2001）
