AUTHOR=Chen Huoyun , Cheng Qun , Chen Qiaoling , Ye Xingzhi , Qu Yong , Song Weiwu , Fahad Shah , Gao Jianhua , Saud Shah , Xu Yi , Shen Yanfen 

TITLE=Effects of Selenium on Growth and Selenium Content Distribution of Virus-Free Sweet Potato Seedlings in Water Culture

JOURNAL=Frontiers in Plant Science

VOLUME=Volume 13 - 2022

YEAR=2022

URL=https://www.frontiersin.org/journals/plant-science/articles/10.3389/fpls.2022.965649

DOI=10.3389/fpls.2022.965649

ISSN=1664-462X

ABSTRACT=To investigate the selenium tolerance of different sweet potato varieties (lines), the effects of different selenium concentrations on plant height, stem diameter, root length, internode number, leaf number, stem and leaf dry and fresh weight, root dryness and fresh weight, stem/leaf ratio, root dry/Fresh ratio, root dry and fresh ratio, leaf SPAD value, Fv/Fm, Fv/Fo and plant selenium content distribution were studied by adding Na2SeO3 to simulated selenium stress. The results showed that when the selenium concentration was more than 3.0 mg/L, the plant growth was significantly affected and the plant height and root length were significantly different compared to the control, while the selenium concentration was 20 mg/L and 40 mg/L had the greatest effect on plant growth when the number of internodes and leaves of the plant decreased, the root system stopped growing and the number of internodes of the plant, the number of leaves and the dry-to-fresh weight ratio of the plant a very significant level compared to reached control. The relative amount of chlorophyll in leaves under treatment with a selenium concentration of 1 mg/L was increased, and the relative amount of chlorophyll in 3 mg/L leaves gradually increased with the increase in the selenium concentration and the values of Fv/Fm and Fv/ Fo  compared to CK under treatment with 40 mg/L selenium concentration and photosynthesis of plants was inhibited. The selenium content in root, stem and leaf increased with the increase in selenium concentration, and the distribution of selenium content in the plant was leaf