De novo transcriptome analysis reveals an unperturbed transcriptome under high cadmium conditions in the CD-hypertolerant fern athyrium yokoscense

Yuko Ukai, Komaki Inoue, Manaka Kamada, Hiroshi Teramura, Shunsuke Yanagisawa, Kazuyoshi Kitazaki, Kazuhiro Shoji, Fumiyuki Goto, Keiichi Mochida, Toshihiro Yoshihara, Hiroaki Shimada

    Research output: Contribution to journalArticlepeer-review

    Abstract

    Athyrium yokoscense shows strong tolerance to cadmium exposure, even at levels that are many times greater than the toxic levels in ordinary plants. To determine the mechanism of Cd tolerance in A. yokoscense, we grew these plants under high Cd conditions and observed the tissue-specific accumulation of Cd and generation of reactive oxygen species, which is one of the major physiological responses to Cd stress. Fuchsin staining indicated the existence of a casparian strip in A. yokoscense roots, which may participate in Cd hypertolerance in A. yokoscense. Moreover, we performed RNA-seq of RNA samples from A. yokoscense plants treated with or without Cd exposure and obtained comprehensive RNA sequences as well as the Cd-responsive expression patterns of individual genes. Through de novo tran-scriptome assembly and gene expression analysis, we found that A. yokoscense showed normal features with no significant change in the expression levels of any transporter genes, even under high Cd exposure conditions. Our results demon-strate that A. yokoscense has an unusual mechanism that allows the invading Cd to partition into the distal roots, thus avoiding translocation of Cd into the xylem.

    Original languageEnglish
    Pages (from-to)65-74
    Number of pages10
    JournalGenes and Genetic Systems
    Volume95
    Issue number2
    DOIs
    Publication statusPublished - 2020

    Keywords

    • Athyrium yokoscense
    • Cadmium tolerance
    • Casparian strip
    • Fern genome
    • Transcriptome analysis
    • Transporter gene

    ASJC Scopus subject areas

    • Molecular Biology
    • Genetics

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