Graphitic carbon nitride nanosheets mitigate cadmium toxicity in Glycine max L.by promoting cadmium retention in root and improving photosynthetic performance  

作　　者：Kai Xu Yunyu Guo Chenghua Xing Ronglong Fu Bin Zou Rongchuan Liu Luyi Cai Jianfang Yan Xi-Lin Wu Miaozhen Cai 

机构地区：[1]College of Geography and Environmental Sciences,Zhejiang Normal University,Jinhua 321004,China [2]College of Agriculture,Jinhua Polytechnic,Jinhua 321007,China

出　　处：《Journal of Environmental Sciences》2024年第5期543-555,共13页环境科学学报（英文版）

基　　金：financial support from the National Natural Science Foundation of China(Nos.30800705,31101599);the Natural Science Foundation of Zhejiang Provincial(Nos.LY18C150007,LY15C150004);Key Research and Development Projects of Social Development of Jinhua Science and Technology Program(No.2021C22750);the Zhejiang Provincial Key Laboratory of Subtropic Soil and Plant Nutrition,China。

摘　　要：Cadmium(Cd)pollution poses a serious threat to plant growth and yield.Nanomaterials have shown great application potential for alleviation of Cd toxicity to plants.In this study,we applied graphitic carbon nitride nanosheets(g-C_(3)N_(4)NSs)for alleviation of Cd-toxicity to soybean(Glycine max L.).The g-C_(3)N_(4)NSs supplementation significantly improved plant growth and reduced oxidative damage in the Cd-toxicated soybean seedlings through hydroponic culture.Particularly,the g-C_(3)N_(4)NSs dynamically regulated the root cell wall(RCW)components by increasing pectin content and modifying its demethylation via enhancing pectin methylesterase(PME)activity,therefore greatly enhanced stronger RCW-Cd retention(up to 82.8%)and reduced Cd migration to the shoot.Additionally,the g-C_(3)N_(4)NSs reversed the Cd-induced chlorosis,increased photosynthetic efficiency because of enhancement in F_v/F_mration,Y(Ⅱ)and sugars content.These results provide new insights into the alleviation of Cd toxicity to plants by g-C_(3)N_(4)NSs,and shed light on the application of low-cost and environmental-friendly carbon-based NMs for alleviating heavy metal toxicity to plants.

关 键 词：CADMIUM Carbon nitride nanosheets Cell wall PECTIN Pectin methylesterase SOYBEAN 

分 类 号：X173[环境科学与工程—环境科学]