O-acetylserine (thiol) lyase activity in Phragmites and Typha plants under cadmium and NaCl stress conditions and the involvement of ABA in the stress response

Erika Fediuc, S. Herman Lips, László Erdei

    Research output: Contribution to journalArticlepeer-review

    71 Scopus citations

    Abstract

    The roles of O-acetylserine (thiol) lyase (OASTL, EC 4.2.99.8) and abscisic (ABA) acid in stress responses to NaCl and cadmium treatments were investigated in Typha latifolia L. and Phragmites australis (Cav.) Trin. ex Steudel plants. OASTL activity increased under stress (25-300 μM Cd, 100 mM NaCl, 1 μM ABA) in both Typha and Phragmites mainly in roots, contributing substantially to satisfy the higher demand of cysteine for adaptation and protection. The earliest significant responses in intact roots were recorded after 12-24 h of Cd treatments, but different levels of stimulation were also observed after 3 and 7 days of exposure. The OASTL activity responses of Phragmites to salinity (100 mM NaCl) were higher than those of Typha. Cysteine synthesis in Typha is much higher than in Phragmites, which supports the efficiency of the thiol-metabolism-based protection shown in Typha. Exogenous ABA increased OASTL activity in both species. Cd treatments led to increased ABA levels in roots. Phragmites showed higher ABA levels compared to Typha. The increase of ABA content indicates the involvement of this phytohormone in early stress responses, while the stimulation of OASTL following the ABA application suggests that ABA has a role in an OASTL activation pathway.

    Original languageEnglish
    Pages (from-to)865-872
    Number of pages8
    JournalJournal of Plant Physiology
    Volume162
    Issue number8
    DOIs
    StatePublished - 23 Aug 2005

    Keywords

    • Abscisic acid
    • Cadmium stress
    • O-acetylserine (thiol) lyase
    • Phragmites
    • Salt stress
    • Typha

    ASJC Scopus subject areas

    • Physiology
    • Agronomy and Crop Science
    • Plant Science

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