Screening of Cd-tolerant Fungi with High Cd Removal Ability and Their Effects on Wheat Growth and Cd Accumulation
LI Shihang
GAO Wei
LI Yangyang
SUN Shilong
BAN Jiahao
NIE Zhaojun
GENG Yuehua
WANG Min
ZHAO Peng
Abstract：This study screened native fungi with high cadmium tolerance and removal performance from soil and plants contaminated with heavy metals in wheat fields,and produced solid fermentation remediation agents.Then it conducted wheat safety testing in healthy soil and investigated the effects of remediation agents on wheat growth and cadmium absorption under in-situ heavy metal pollution conditions.The results showed that four functional fungi(M6,M10,M7,M3)with tolerance of up to 600 μmol/L Cd2+concentration and high cadmium removal rate in liquid culture medium containing 50 mg/L Cd2+were isolated and screened,with removal rates of 99.7%,79.3%,64.1%,and 62.8%,respectively.They were identified as Fusarium sp.,Trichoderma harzianum,Alternaria sp.,and Chaetomium sp..In wheat safety testing,only M6 was found to inhibit the emergence rate and biomass of wheat.Under in-situ heavy metal contaminated soil,the addition of M3,M7,and M10 significantly increased the fresh weight(22.0%—43.7%)and dry weight(15.7%—64.4%)of wheat,meanwhile significantly reducing the accumulation of Cd in the wheat root(37.2%—53.4%).Among them,M7 treatment had the best effect.In summary,Chaetomium sp.M7 could promote the growth of wheat seedlings under cadmium stress and reduce cadmium accumulation,which could be used for soil heavy metal pollution control.
Keywords：WheatFungiHeavy metalCadmiumMicrobial remediation
Publication Date：2025-05-15
Online Publishing Date：2026-09-12(First online date of this platform, not the publication date of the document)
Pages：9( 59-67 )