The implications of planting mode on cadmium uptake and remobilization in rice: Field experiments across growth stages

作     者：Xiao Deng Yixuan Chen Yang Yang Liang Peng Luo Si Qingru Zeng Xiao Deng;Yixuan Chen;Yang Yang;Liang Peng;Luo Si;Qingru Zeng

作者机构：College of Resources and EnvironmentHunan Agricultural UniversityChangsha 410128China 

出 版 物：《Frontiers of Environmental Science & Engineering》 (环境科学与工程前沿（英文）)

年 卷 期：2021年第15卷第6期

页      面：457-469页

核心收录：

学科分类：09[农学] 0901[农学-作物学] 

基　　金：supported by grants from the National Natural Science Foundation of China(Nos.42077142 and 41701366) the Changsha Plan Project of Science and Technology(kq1801025) 

主　　题：Cadmium Genotypes Growth stages Micro X-ray fluorescence Planting mode 

摘      要：Global rice production practices have gradually changed from a reliance on transplanting to direct *** how this shift may alter cadmium(Cd)accumulation in rice is poorly *** we conducted field experiments with two rice genotypes cultivars that were planted using three methods:via direct seeding(DS),seedling throwing(ST),and manual transplanting(MT).Rice samples were collected during four growth *** formation and distribution of iron plaque were analyzed using DCB(dithionite-citrate-bicarbonate)extractions and observed under micro-XRF(micro X-ray fluorescence).The results revealed that,in each growth stage,DS rice was more apt to harbor Cd distributed in the plant’s aerial parts,and the Cd concentration of brown rice from DS was 21.8%–43.3%significantly higher than those from ST and MT at maturity stage(p0.05).During the vegetative stages,the Cd uptake percentage was higher in DS than MT rice,and those plants arising from the DS method were capable of absorbing more Cd earlier in their growth and ***,using DS decreased the amount of iron plaque covering the root surface in every growth stage,especially in the critical period of Cd accumulation,such that the roots’middle areas were distinguished by a near-complete absence of iron plaque,thus weakening its role as an effective barrier to Cd uptake from ***,this study demonstrated that implementing the DS mode of planting will increase Cd’s distribution in the aboveground parts of rice,and heightening the risk of Cd contamination in grain.