Polyamines reprogram oxidative and nitrosative status and the proteome of citrus plants exposed to salinity stress

Georgia Tanou, Vasileios Ziogas, Maya Belghazi, Anastasis Christou, Panagiota Filippou, Dominique Job, Vasileios Fotopoulos, Athanassios Molassiotis

    Research output: Contribution to journalArticle

    68 Citations (Scopus)

    Abstract

    The interplay among polyamines (PAs) and reactive oxygen and nitrogen species (RNS and ROS) is emerging as a key issue in plant responses to salinity. To address this question, we analysed the impact of exogenous PAs [putrescine (Put), spermidine (Spd) and spermine (Spm)] on the oxidative and nitrosative status in citrus plants exposed to salinity. PAs partially reversed the NaCl-induced phenotypic and physiological disturbances. The expression of PA biosynthesis (ADC, SAMDC, SPDS and SPMS) and catabolism (DAO and PAO) genes was systematically up-regulated by PAs. In addition, PAs altered the oxidative status in salt-stressed plants as inferred by changes in ROS production and redox status accompanied by regulation of transcript expression and activities of various antioxidant enzymes. Furthermore, NaCl-induced up-regulation of NO-associated genes, such as NR, NADde, NOS-like and AOX, along with S-nitrosoglutathione reductase and nitrate reductase activities, was partially restored by PAs. Protein carbonylation and tyrosine nitration are depressed by specific PAs whereas protein S-nitrosylation was elicited by all PAs. Furthermore, we identified 271 S-nitrosylated proteins that were commonly or preferentially targeted by salinity and individual PAs. This work helps improve our knowledge on the plant's response to environmental challenge.

    Original languageEnglish
    Pages (from-to)864-885
    Number of pages22
    JournalPlant, Cell and Environment
    Volume37
    Issue number4
    DOIs
    Publication statusPublished - 1 Apr 2014

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