Single-wall carbon nanotubes improve cell survival rate and reduce oxidative injury in cryopreservation of Agapanthus praecox embryogenic callus

Plant Methods

Di Zhang¹  Li Ren²  Yunxia Chu²  Yiying Zhang²  Hairong Chen²  Shan Deng²  Hong Zhao² 

[1] Department of Landscape Science and Engineering, School of Design, Shanghai Jiao Tong University, NO. 800, Rd. Dong Chuan, 200240, Shanghai, China;Institute for Agri-food Standards and Testing Technology, Shanghai Academy of Agricultural Sciences, NO. 888, Rd. Yezhuang, 201403, Shanghai, China;

关键词: Agapanthus praecox;    Cryopreservation;    Oxidative stress;    Single-wall carbon nanotubes;   

DOI  :  10.1186/s13007-020-00674-6

来源: Springer

【 摘 要 】

BackgroundCryopreservation is the best way for long-term in vitro preservation of plant germplasm resources. The preliminary studies found that reactive oxygen species (ROS) induced oxidative stress and ice-induced membrane damage are the fundamental causes of cell death in cryopreserved samples. How to improve plant cryopreservation survival rate is an important scientific issue in the cryobiology field.ResultsThis study found that the survival rate was significantly improved by adding single-wall carbon nanotubes (SWCNTs) to plant vitrification solution (PVS) in cryopreservation of Agapanthus praecox embryogenic callus (EC), and analyzed the oxidative response of cells during the control and SWCNTs-added cryopreservation protocol. The SWCNTs entered EC at the step of dehydration and mainly located around the cell wall and in the vesicles, and most of SWCNTs moved out of EC during the dilution step. Combination with physiological index and gene quantitative expression results, SWCNTs affect the ROS signal transduction and antioxidant system response during plant cryopreservation. The EC treated by SWCNTs had higher antioxidant levels, like POD, CAT, and GSH than the control group EC. The EC mainly depended on the AsA-GSH and GPX cycle to scavenge H2O2 in the control cryopreservation, but depended on CAT in the SWCNTs-added cryopreservation which lead to low levels of H2O2 and MDA. The elevated antioxidant level in dehydration by adding SWCNTs enhanced cells resistance to injury during cryopreservation. The ROS signals of EC were balanced and stable in the SWCNTs-added cryopreservation.ConclusionsThe SWCNTs regulated oxidative stress responses of EC during the process and controlled oxidative damages by the maintenance of ROS homeostasis to achieve a high survival rate after cryopreservation. This study is the first to systematically describe the role of carbon nanomaterial in the regulation of plant oxidative stress response, and provided a novel insight into the application of nanomaterials in the field of cryobiology.

【 授权许可】

CC BY