Leaf gas films delay salt entry and enhance underwater photosynthesis and internal aeration of Melilotus siculus submerged in saline water

Natasha Teakle, T.D. Colmer, O.C. Pedersen

    Research output: Contribution to journalArticle

    13 Citations (Scopus)

    Abstract

    © 2014 John Wiley & Sons Ltd. A combination of flooding and salinity is detrimental to most plants. We studied tolerance of complete submergence in saline water for Melilotus siculus, an annual legume with superhydrophobic leaf surfaces that retain gas films when under water. M.siculus survived complete submergence of 1 week at low salinity (up to 50molm-3 NaCl), but did not recover following de-submergence from 100molm-3 NaCl. The leaf gas films protected against direct salt ingress into the leaves when submerged in saline water, enabling underwater photosynthesis even after 3d of complete submergence. By contrast, leaves with the gas films experimentally removed suffered from substantial Na+ and Cl- intrusion and lost the capacity for underwater photosynthesis. Similarly, plants in saline water and without gas films lost more K+ than those with intact gas films. This study has demonstrated that leaf gas films reduce Na+ and Cl- ingress into leaves when submerged by saline water - the thin gas layer physically separates the floodwater from the leaf surface. This feature aids survival of plants exposed to short-term saline submergence, as well as the previously recognized beneficial effects of gas exchange under water.
    Original languageEnglish
    Pages (from-to)2339-2349
    JournalPlant, Cell and Environment.
    Volume37
    Issue number10
    DOIs
    Publication statusPublished - 2014

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