De-submergence-induced ethylene production in Rumex palustris: regulation and ecophysiological significance

L.A.C. Voesenek, M.B. Jackson, A.H.W. Toebes, W. Huibers, W.H. Vriezen, Tim Colmer

    Research output: Contribution to journalArticleResearchpeer-review

    Abstract

    Rumex palustris responds to total submergence by increasing the elongation rate of young petioles. This favours survival by shortening the duration of submergence. Underwater elongation is stimulated by ethylene entrapped within the plant by surrounding water. However, abnormally fast extension rates were found to be maintained even when leaf tips emerged above the floodwater. This fast post-submergence growth was linked to a promotion of ethylene production that is presumed to compensate for losses brought about by ventilation. Three sources of ACC contributed to post-submergence ethylene production in R. palustris: (i) ACC that had accumulated in the roots during submergence and was transported in xylem sap to the shoot when stomata re-opened and transpiration resumed, (ii) ACC that had accumulated in the shoot during the preceding period of submergence and (iii) ACC produced de novo in the shoot following de-submergence. This new production of ethylene was associated with increased expression of an ACC synthase gene (RP-ACS1) and an ACC oxidase gene (RP-ACO1), increased ACC synthase activity and a doubling of ACC oxidase activity, measured in vitro. Out of seven species of Rumex examined, a de-submergence upsurge in ethylene production was seen only in shoots of those that had the ability to elongate fast when submerged.
    Original languageEnglish
    Pages (from-to)341-352
    JournalThe Plant Journal
    Volume33
    Issue number2
    DOIs
    Publication statusPublished - 2003

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